diff --git a/browser_tests/tests/versionMismatchWarnings.spec.ts b/browser_tests/tests/versionMismatchWarnings.spec.ts
new file mode 100644
index 0000000000..d85f187238
--- /dev/null
+++ b/browser_tests/tests/versionMismatchWarnings.spec.ts
@@ -0,0 +1,117 @@
+import { expect } from '@playwright/test'
+
+import { SystemStats } from '../../src/schemas/apiSchema'
+import { comfyPageFixture as test } from '../fixtures/ComfyPage'
+
+test.describe('Version Mismatch Warnings', () => {
+  const ALWAYS_AHEAD_OF_INSTALLED_VERSION = '100.100.100'
+  const ALWAYS_BEHIND_INSTALLED_VERSION = '0.0.0'
+
+  const createMockSystemStatsRes = (
+    requiredFrontendVersion: string
+  ): SystemStats => {
+    return {
+      system: {
+        os: 'posix',
+        ram_total: 67235385344,
+        ram_free: 13464207360,
+        comfyui_version: '0.3.46',
+        required_frontend_version: requiredFrontendVersion,
+        python_version: '3.12.3 (main, Jun 18 2025, 17:59:45) [GCC 13.3.0]',
+        pytorch_version: '2.6.0+cu124',
+        embedded_python: false,
+        argv: ['main.py']
+      },
+      devices: [
+        {
+          name: 'cuda:0 NVIDIA GeForce RTX 4070 : cudaMallocAsync',
+          type: 'cuda',
+          index: 0,
+          vram_total: 12557156352,
+          vram_free: 2439249920,
+          torch_vram_total: 0,
+          torch_vram_free: 0
+        }
+      ]
+    }
+  }
+
+  test.beforeEach(async ({ comfyPage }) => {
+    await comfyPage.setSetting('Comfy.UseNewMenu', 'Top')
+  })
+
+  test('should show version mismatch warnings when installed version lower than required', async ({
+    comfyPage
+  }) => {
+    // Mock system_stats route to indicate that the installed version is always ahead of the required version
+    await comfyPage.page.route('**/system_stats**', async (route) => {
+      await route.fulfill({
+        status: 200,
+        contentType: 'application/json',
+        body: JSON.stringify(
+          createMockSystemStatsRes(ALWAYS_AHEAD_OF_INSTALLED_VERSION)
+        )
+      })
+    })
+    await comfyPage.setup()
+
+    // Expect a warning toast to be shown
+    await expect(
+      comfyPage.page.getByText('Version Compatibility Warning')
+    ).toBeVisible()
+  })
+
+  test('should not show version mismatch warnings when installed version is ahead of required', async ({
+    comfyPage
+  }) => {
+    // Mock system_stats route to indicate that the installed version is always ahead of the required version
+    await comfyPage.page.route('**/system_stats**', async (route) => {
+      await route.fulfill({
+        status: 200,
+        contentType: 'application/json',
+        body: JSON.stringify(
+          createMockSystemStatsRes(ALWAYS_BEHIND_INSTALLED_VERSION)
+        )
+      })
+    })
+    await comfyPage.setup()
+
+    // Expect no warning toast to be shown
+    await expect(
+      comfyPage.page.getByText('Version Compatibility Warning')
+    ).not.toBeVisible()
+  })
+
+  test('should persist dismissed state across sessions', async ({
+    comfyPage
+  }) => {
+    // Mock system_stats route to indicate that the installed version is always ahead of the required version
+    await comfyPage.page.route('**/system_stats**', async (route) => {
+      await route.fulfill({
+        status: 200,
+        contentType: 'application/json',
+        body: JSON.stringify(
+          createMockSystemStatsRes(ALWAYS_AHEAD_OF_INSTALLED_VERSION)
+        )
+      })
+    })
+    await comfyPage.setup()
+
+    // Locate the warning toast and dismiss it
+    const warningToast = comfyPage.page
+      .locator('div')
+      .filter({ hasText: 'Version Compatibility' })
+      .nth(3)
+    await warningToast.waitFor({ state: 'visible' })
+    const dismissButton = warningToast.getByRole('button', { name: 'Close' })
+    await dismissButton.click()
+
+    // Reload the page, keeping local storage
+    await comfyPage.setup({ clearStorage: false })
+
+    // The same warning from same versions should not be shown to the user again
+    await expect(
+      comfyPage.page.getByText('Version Compatibility Warning')
+    ).not.toBeVisible()
+  })
+})
diff --git a/package-lock.json b/package-lock.json
index fa5cee570b..5ec43f6632 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -40,6 +40,7 @@
         "pinia": "^2.1.7",
         "primeicons": "^7.0.0",
         "primevue": "^4.2.5",
+        "semver": "^7.7.2",
         "three": "^0.170.0",
         "tiptap-markdown": "^0.8.10",
         "vue": "^3.5.13",
@@ -62,6 +63,7 @@
         "@types/fs-extra": "^11.0.4",
         "@types/lodash": "^4.17.6",
         "@types/node": "^20.14.8",
+        "@types/semver": "^7.7.0",
         "@types/three": "^0.169.0",
         "@vitejs/plugin-vue": "^5.1.4",
         "@vue/test-utils": "^2.4.6",
@@ -557,6 +559,15 @@
         "url": "https://opencollective.com/babel"
       }
     },
+    "node_modules/@babel/core/node_modules/semver": {
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
+      "dev": true,
+      "bin": {
+        "semver": "bin/semver.js"
+      }
+    },
     "node_modules/@babel/generator": {
       "version": "7.27.1",
       "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.27.1.tgz",
@@ -601,6 +612,15 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@babel/helper-compilation-targets/node_modules/semver": {
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
+      "dev": true,
+      "bin": {
+        "semver": "bin/semver.js"
+      }
+    },
     "node_modules/@babel/helper-create-class-features-plugin": {
       "version": "7.27.1",
       "resolved": "https://registry.npmjs.org/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.27.1.tgz",
@@ -622,6 +642,15 @@
         "@babel/core": "^7.0.0"
       }
     },
+    "node_modules/@babel/helper-create-class-features-plugin/node_modules/semver": {
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
+      "dev": true,
+      "bin": {
+        "semver": "bin/semver.js"
+      }
+    },
     "node_modules/@babel/helper-member-expression-to-functions": {
       "version": "7.27.1",
       "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.27.1.tgz",
@@ -2422,18 +2451,6 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
-    "node_modules/@intlify/eslint-plugin-vue-i18n/node_modules/semver": {
-      "version": "7.7.2",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.2.tgz",
-      "integrity": "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==",
-      "dev": true,
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/@intlify/eslint-plugin-vue-i18n/node_modules/synckit": {
       "version": "0.9.3",
       "resolved": "https://registry.npmjs.org/synckit/-/synckit-0.9.3.tgz",
@@ -4523,6 +4540,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/semver": {
+      "version": "7.7.0",
+      "resolved": "https://registry.npmjs.org/@types/semver/-/semver-7.7.0.tgz",
+      "integrity": "sha512-k107IF4+Xr7UHjwDc7Cfd6PRQfbdkiRabXGRjo07b4WyPahFBZCZ1sE+BNxYIJPPg73UkfOsVOLwqVc/6ETrIA==",
+      "dev": true
+    },
     "node_modules/@types/stats.js": {
       "version": "0.17.3",
       "resolved": "https://registry.npmjs.org/@types/stats.js/-/stats.js-0.17.3.tgz",
@@ -4754,19 +4777,6 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
-    "node_modules/@typescript-eslint/typescript-estree/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/@typescript-eslint/utils": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-8.0.0.tgz",
@@ -6537,19 +6547,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/conf/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/confbox": {
       "version": "0.1.7",
       "resolved": "https://registry.npmjs.org/confbox/-/confbox-0.1.7.tgz",
@@ -7449,19 +7446,6 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
-    "node_modules/editorconfig/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/ee-first": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
@@ -7741,18 +7725,6 @@
         "eslint": ">=6.0.0"
       }
     },
-    "node_modules/eslint-compat-utils/node_modules/semver": {
-      "version": "7.7.2",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.2.tgz",
-      "integrity": "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==",
-      "dev": true,
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/eslint-config-prettier": {
       "version": "10.1.2",
       "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-10.1.2.tgz",
@@ -7852,19 +7824,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/eslint-plugin-vue/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/eslint-plugin-vue/node_modules/type-fest": {
       "version": "0.20.2",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
@@ -10284,18 +10243,6 @@
         "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/jsonc-eslint-parser/node_modules/semver": {
-      "version": "7.7.2",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.2.tgz",
-      "integrity": "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==",
-      "dev": true,
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/jsondiffpatch": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/jsondiffpatch/-/jsondiffpatch-0.6.0.tgz",
@@ -10726,19 +10673,6 @@
         "node": ">=14"
       }
     },
-    "node_modules/langsmith/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/latest-version": {
       "version": "9.0.0",
       "resolved": "https://registry.npmjs.org/latest-version/-/latest-version-9.0.0.tgz",
@@ -12688,19 +12622,6 @@
       "integrity": "sha512-dATvCeZN/8wQsGywez1mzHtTlP22H8OEfPrVMLNr4/eGa+ijtLn/6M5f0dY8UKNrC2O9UCU6SSoG3qRKnt7STw==",
       "dev": true
     },
-    "node_modules/package-json/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/package-manager-detector": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/package-manager-detector/-/package-manager-detector-0.2.0.tgz",
@@ -14343,12 +14264,14 @@
       "dev": true
     },
     "node_modules/semver": {
-      "version": "6.3.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
-      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
-      "dev": true,
+      "version": "7.7.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.2.tgz",
+      "integrity": "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==",
       "bin": {
         "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
       }
     },
     "node_modules/send": {
@@ -16207,19 +16130,6 @@
         "url": "https://github.com/yeoman/update-notifier?sponsor=1"
       }
     },
-    "node_modules/update-notifier/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/uri-js": {
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
@@ -17039,19 +16949,6 @@
         "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/vue-eslint-parser/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/vue-i18n": {
       "version": "9.14.3",
       "resolved": "https://registry.npmjs.org/vue-i18n/-/vue-i18n-9.14.3.tgz",
@@ -17104,19 +17001,6 @@
         "typescript": ">=5.0.0"
       }
     },
-    "node_modules/vue-tsc/node_modules/semver": {
-      "version": "7.6.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
-      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/vuefire": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/vuefire/-/vuefire-3.2.1.tgz",
diff --git a/package.json b/package.json
index 2dfd9aa87a..b394bc70b9 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "@types/fs-extra": "^11.0.4",
     "@types/lodash": "^4.17.6",
     "@types/node": "^20.14.8",
+    "@types/semver": "^7.7.0",
     "@types/three": "^0.169.0",
     "@vitejs/plugin-vue": "^5.1.4",
     "@vue/test-utils": "^2.4.6",
@@ -105,6 +106,7 @@
     "pinia": "^2.1.7",
     "primeicons": "^7.0.0",
     "primevue": "^4.2.5",
+    "semver": "^7.7.2",
     "three": "^0.170.0",
     "tiptap-markdown": "^0.8.10",
     "vue": "^3.5.13",
diff --git a/src/composables/useFrontendVersionMismatchWarning.ts b/src/composables/useFrontendVersionMismatchWarning.ts
new file mode 100644
index 0000000000..11897a0162
--- /dev/null
+++ b/src/composables/useFrontendVersionMismatchWarning.ts
@@ -0,0 +1,94 @@
+import { whenever } from '@vueuse/core'
+import { computed, onMounted } from 'vue'
+import { useI18n } from 'vue-i18n'
+
+import { useToastStore } from '@/stores/toastStore'
+import { useVersionCompatibilityStore } from '@/stores/versionCompatibilityStore'
+
+export interface UseFrontendVersionMismatchWarningOptions {
+  immediate?: boolean
+}
+
+/**
+ * Composable for handling frontend version mismatch warnings.
+ *
+ * Displays toast notifications when the frontend version is incompatible with the backend,
+ * either because the frontend is outdated or newer than the backend expects.
+ * Automatically dismisses warnings when shown and persists dismissal state for 7 days.
+ *
+ * @param options - Configuration options
+ * @param options.immediate - If true, automatically shows warning when version mismatch is detected
+ * @returns Object with methods and computed properties for managing version warnings
+ *
+ * @example
+ * ```ts
+ * // Show warning immediately when mismatch detected
+ * const { showWarning, shouldShowWarning } = useFrontendVersionMismatchWarning({ immediate: true })
+ *
+ * // Manual control
+ * const { showWarning } = useFrontendVersionMismatchWarning()
+ * showWarning() // Call when needed
+ * ```
+ */
+export function useFrontendVersionMismatchWarning(
+  options: UseFrontendVersionMismatchWarningOptions = {}
+) {
+  const { immediate = false } = options
+  const { t } = useI18n()
+  const toastStore = useToastStore()
+  const versionCompatibilityStore = useVersionCompatibilityStore()
+
+  // Track if we've already shown the warning
+  let hasShownWarning = false
+
+  const showWarning = () => {
+    // Prevent showing the warning multiple times
+    if (hasShownWarning) return
+
+    const message = versionCompatibilityStore.warningMessage
+    if (!message) return
+
+    const detailMessage = t('g.frontendOutdated', {
+      frontendVersion: message.frontendVersion,
+      requiredVersion: message.requiredVersion
+    })
+
+    const fullMessage = t('g.versionMismatchWarningMessage', {
+      warning: t('g.versionMismatchWarning'),
+      detail: detailMessage
+    })
+
+    toastStore.addAlert(fullMessage)
+    hasShownWarning = true
+
+    // Automatically dismiss the warning so it won't show again for 7 days
+    versionCompatibilityStore.dismissWarning()
+  }
+
+  onMounted(() => {
+    // Only set up the watcher if immediate is true
+    if (immediate) {
+      whenever(
+        () => versionCompatibilityStore.shouldShowWarning,
+        () => {
+          showWarning()
+        },
+        {
+          immediate: true,
+          once: true
+        }
+      )
+    }
+  })
+
+  return {
+    showWarning,
+    shouldShowWarning: computed(
+      () => versionCompatibilityStore.shouldShowWarning
+    ),
+    dismissWarning: versionCompatibilityStore.dismissWarning,
+    hasVersionMismatch: computed(
+      () => versionCompatibilityStore.hasVersionMismatch
+    )
+  }
+}
diff --git a/src/locales/en/main.json b/src/locales/en/main.json
index df92e481bf..5fa4aa4226 100644
--- a/src/locales/en/main.json
+++ b/src/locales/en/main.json
@@ -98,6 +98,12 @@
     "nodes": "Nodes",
     "community": "Community",
     "all": "All",
+    "versionMismatchWarning": "Version Compatibility Warning",
+    "versionMismatchWarningMessage": "{warning}: {detail} Visit https://docs.comfy.org/installation/update_comfyui#common-update-issues for update instructions.",
+    "frontendOutdated": "Frontend version {frontendVersion} is outdated. Backend requires {requiredVersion} or higher.",
+    "frontendNewer": "Frontend version {frontendVersion} may not be compatible with backend version {backendVersion}.",
+    "updateFrontend": "Update Frontend",
+    "dismiss": "Dismiss",
     "update": "Update",
     "updated": "Updated",
     "resultsCount": "Found {count} Results",
@@ -1337,6 +1343,13 @@
     "outdatedVersionGeneric": "Some nodes require a newer version of ComfyUI. Please update to use all nodes.",
     "coreNodesFromVersion": "Requires ComfyUI {version}:"
   },
+  "versionMismatchWarning": {
+    "title": "Version Compatibility Warning",
+    "frontendOutdated": "Frontend version {frontendVersion} is outdated. Backend requires version {requiredVersion} or higher.",
+    "frontendNewer": "Frontend version {frontendVersion} may not be compatible with backend version {backendVersion}.",
+    "updateFrontend": "Update Frontend",
+    "dismiss": "Dismiss"
+  },
   "errorDialog": {
     "defaultTitle": "An error occurred",
     "loadWorkflowTitle": "Loading aborted due to error reloading workflow data",
diff --git a/src/schemas/apiSchema.ts b/src/schemas/apiSchema.ts
index 12fbe2981c..f2ad92e972 100644
--- a/src/schemas/apiSchema.ts
+++ b/src/schemas/apiSchema.ts
@@ -320,6 +320,7 @@ export const zSystemStats = z.object({
     embedded_python: z.boolean(),
     comfyui_version: z.string(),
     pytorch_version: z.string(),
+    required_frontend_version: z.string().optional(),
     argv: z.array(z.string()),
     ram_total: z.number(),
     ram_free: z.number()
diff --git a/src/stores/README.md b/src/stores/README.md
index 3a61d7ae65..de45fdc71a 100644
--- a/src/stores/README.md
+++ b/src/stores/README.md
@@ -135,6 +135,7 @@ The following table lists ALL stores in the system as of 2025-01-30:
 | toastStore.ts | Manages toast notifications | UI |
 | userFileStore.ts | Manages user file operations | Files |
 | userStore.ts | Manages user data and preferences | User |
+| versionCompatibilityStore.ts | Manages frontend/backend version compatibility warnings | Core |
 | widgetStore.ts | Manages widget configurations | Widgets |
 | workflowStore.ts | Handles workflow data and operations | Workflows |
 | workflowTemplatesStore.ts | Manages workflow templates | Workflows |
diff --git a/src/stores/versionCompatibilityStore.ts b/src/stores/versionCompatibilityStore.ts
new file mode 100644
index 0000000000..da483846e3
--- /dev/null
+++ b/src/stores/versionCompatibilityStore.ts
@@ -0,0 +1,138 @@
+import { useStorage } from '@vueuse/core'
+import { defineStore } from 'pinia'
+import * as semver from 'semver'
+import { computed } from 'vue'
+
+import config from '@/config'
+import { useSystemStatsStore } from '@/stores/systemStatsStore'
+
+const DISMISSAL_DURATION_MS = 7 * 24 * 60 * 60 * 1000 // 7 days
+
+export const useVersionCompatibilityStore = defineStore(
+  'versionCompatibility',
+  () => {
+    const systemStatsStore = useSystemStatsStore()
+
+    const frontendVersion = computed(() => config.app_version)
+    const backendVersion = computed(
+      () => systemStatsStore.systemStats?.system?.comfyui_version ?? ''
+    )
+    const requiredFrontendVersion = computed(
+      () =>
+        systemStatsStore.systemStats?.system?.required_frontend_version ?? ''
+    )
+
+    const isFrontendOutdated = computed(() => {
+      if (
+        !frontendVersion.value ||
+        !requiredFrontendVersion.value ||
+        !semver.valid(frontendVersion.value) ||
+        !semver.valid(requiredFrontendVersion.value)
+      ) {
+        return false
+      }
+      // Returns true if required version is greater than frontend version
+      return semver.gt(requiredFrontendVersion.value, frontendVersion.value)
+    })
+
+    const isFrontendNewer = computed(() => {
+      // We don't warn about frontend being newer than backend
+      // Only warn when frontend is outdated (behind required version)
+      return false
+    })
+
+    const hasVersionMismatch = computed(() => {
+      return isFrontendOutdated.value
+    })
+
+    const versionKey = computed(() => {
+      if (
+        !frontendVersion.value ||
+        !backendVersion.value ||
+        !requiredFrontendVersion.value
+      ) {
+        return null
+      }
+      return `${frontendVersion.value}-${backendVersion.value}-${requiredFrontendVersion.value}`
+    })
+
+    // Use reactive storage for dismissals - creates a reactive ref that syncs with localStorage
+    // All version mismatch dismissals are stored in a single object for clean localStorage organization
+    const dismissalStorage = useStorage(
+      'comfy.versionMismatch.dismissals',
+      {} as Record<string, number>,
+      localStorage,
+      {
+        serializer: {
+          read: (value: string) => {
+            try {
+              return JSON.parse(value)
+            } catch {
+              return {}
+            }
+          },
+          write: (value: Record<string, number>) => JSON.stringify(value)
+        }
+      }
+    )
+
+    const isDismissed = computed(() => {
+      if (!versionKey.value) return false
+
+      const dismissedUntil = dismissalStorage.value[versionKey.value]
+      if (!dismissedUntil) return false
+
+      // Check if dismissal has expired
+      return Date.now() < dismissedUntil
+    })
+
+    const shouldShowWarning = computed(() => {
+      return hasVersionMismatch.value && !isDismissed.value
+    })
+
+    const warningMessage = computed(() => {
+      if (isFrontendOutdated.value) {
+        return {
+          type: 'outdated' as const,
+          frontendVersion: frontendVersion.value,
+          requiredVersion: requiredFrontendVersion.value
+        }
+      }
+      return null
+    })
+
+    async function checkVersionCompatibility() {
+      if (!systemStatsStore.systemStats) {
+        await systemStatsStore.fetchSystemStats()
+      }
+    }
+
+    function dismissWarning() {
+      if (!versionKey.value) return
+
+      const dismissUntil = Date.now() + DISMISSAL_DURATION_MS
+      dismissalStorage.value = {
+        ...dismissalStorage.value,
+        [versionKey.value]: dismissUntil
+      }
+    }
+
+    async function initialize() {
+      await checkVersionCompatibility()
+    }
+
+    return {
+      frontendVersion,
+      backendVersion,
+      requiredFrontendVersion,
+      hasVersionMismatch,
+      shouldShowWarning,
+      warningMessage,
+      isFrontendOutdated,
+      isFrontendNewer,
+      checkVersionCompatibility,
+      dismissWarning,
+      initialize
+    }
+  }
+)
diff --git a/src/views/GraphView.vue b/src/views/GraphView.vue
index f21cf1b617..f5e2992944 100644
--- a/src/views/GraphView.vue
+++ b/src/views/GraphView.vue
@@ -23,7 +23,14 @@
 import { useBreakpoints, useEventListener } from '@vueuse/core'
 import type { ToastMessageOptions } from 'primevue/toast'
 import { useToast } from 'primevue/usetoast'
-import { computed, onBeforeUnmount, onMounted, watch, watchEffect } from 'vue'
+import {
+  computed,
+  nextTick,
+  onBeforeUnmount,
+  onMounted,
+  watch,
+  watchEffect
+} from 'vue'
 import { useI18n } from 'vue-i18n'
 
 import MenuHamburger from '@/components/MenuHamburger.vue'
@@ -35,6 +42,7 @@ import TopMenubar from '@/components/topbar/TopMenubar.vue'
 import { useBrowserTabTitle } from '@/composables/useBrowserTabTitle'
 import { useCoreCommands } from '@/composables/useCoreCommands'
 import { useErrorHandling } from '@/composables/useErrorHandling'
+import { useFrontendVersionMismatchWarning } from '@/composables/useFrontendVersionMismatchWarning'
 import { useProgressFavicon } from '@/composables/useProgressFavicon'
 import { SERVER_CONFIG_ITEMS } from '@/constants/serverConfig'
 import { i18n } from '@/i18n'
@@ -54,6 +62,7 @@ import {
 } from '@/stores/queueStore'
 import { useServerConfigStore } from '@/stores/serverConfigStore'
 import { useSettingStore } from '@/stores/settingStore'
+import { useVersionCompatibilityStore } from '@/stores/versionCompatibilityStore'
 import { useBottomPanelStore } from '@/stores/workspace/bottomPanelStore'
 import { useColorPaletteStore } from '@/stores/workspace/colorPaletteStore'
 import { useSidebarTabStore } from '@/stores/workspace/sidebarTabStore'
@@ -70,6 +79,8 @@ const settingStore = useSettingStore()
 const executionStore = useExecutionStore()
 const colorPaletteStore = useColorPaletteStore()
 const queueStore = useQueueStore()
+const versionCompatibilityStore = useVersionCompatibilityStore()
+
 const breakpoints = useBreakpoints({ md: 961 })
 const isMobile = breakpoints.smaller('md')
 const showTopMenu = computed(() => isMobile.value || useNewMenu.value === 'Top')
@@ -224,6 +235,17 @@ onBeforeUnmount(() => {
 useEventListener(window, 'keydown', useKeybindingService().keybindHandler)
 
 const { wrapWithErrorHandling, wrapWithErrorHandlingAsync } = useErrorHandling()
+
+// Initialize version mismatch warning in setup context
+// It will be triggered automatically when the store is ready
+useFrontendVersionMismatchWarning({ immediate: true })
+
+void nextTick(() => {
+  versionCompatibilityStore.initialize().catch((error) => {
+    console.warn('Version compatibility check failed:', error)
+  })
+})
+
 const onGraphReady = () => {
   requestIdleCallback(
     () => {
diff --git a/tests-ui/tests/composables/useFrontendVersionMismatchWarning.test.ts b/tests-ui/tests/composables/useFrontendVersionMismatchWarning.test.ts
new file mode 100644
index 0000000000..b8b4fceac7
--- /dev/null
+++ b/tests-ui/tests/composables/useFrontendVersionMismatchWarning.test.ts
@@ -0,0 +1,234 @@
+import { createPinia, setActivePinia } from 'pinia'
+import { vi } from 'vitest'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { nextTick } from 'vue'
+
+import { useFrontendVersionMismatchWarning } from '@/composables/useFrontendVersionMismatchWarning'
+import { useToastStore } from '@/stores/toastStore'
+import { useVersionCompatibilityStore } from '@/stores/versionCompatibilityStore'
+
+// Mock globals
+//@ts-expect-error Define global for the test
+global.__COMFYUI_FRONTEND_VERSION__ = '1.0.0'
+
+// Mock config first - this needs to be before any imports
+vi.mock('@/config', () => ({
+  default: {
+    app_title: 'ComfyUI',
+    app_version: '1.0.0'
+  }
+}))
+
+// Mock app
+vi.mock('@/scripts/app', () => ({
+  app: {
+    ui: {
+      settings: {
+        dispatchChange: vi.fn()
+      }
+    }
+  }
+}))
+
+// Mock api
+vi.mock('@/scripts/api', () => ({
+  api: {
+    getSettings: vi.fn(() => Promise.resolve({})),
+    storeSetting: vi.fn(() => Promise.resolve(undefined))
+  }
+}))
+
+// Mock vue-i18n
+vi.mock('vue-i18n', () => ({
+  useI18n: () => ({
+    t: (key: string, params?: any) => {
+      if (key === 'g.versionMismatchWarning')
+        return 'Version Compatibility Warning'
+      if (key === 'g.versionMismatchWarningMessage' && params) {
+        return `${params.warning}: ${params.detail} Visit https://docs.comfy.org/installation/update_comfyui#common-update-issues for update instructions.`
+      }
+      if (key === 'g.frontendOutdated' && params) {
+        return `Frontend version ${params.frontendVersion} is outdated. Backend requires ${params.requiredVersion} or higher.`
+      }
+      if (key === 'g.frontendNewer' && params) {
+        return `Frontend version ${params.frontendVersion} may not be compatible with backend version ${params.backendVersion}.`
+      }
+      return key
+    }
+  }),
+  createI18n: vi.fn(() => ({
+    global: {
+      locale: { value: 'en' },
+      t: vi.fn()
+    }
+  }))
+}))
+
+// Mock lifecycle hooks to track their calls
+const mockOnMounted = vi.fn()
+vi.mock('vue', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('vue')>()
+  return {
+    ...actual,
+    onMounted: (fn: () => void) => {
+      mockOnMounted()
+      fn()
+    }
+  }
+})
+
+describe('useFrontendVersionMismatchWarning', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    setActivePinia(createPinia())
+  })
+
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('should not show warning when there is no version mismatch', () => {
+    const toastStore = useToastStore()
+    const versionStore = useVersionCompatibilityStore()
+    const addAlertSpy = vi.spyOn(toastStore, 'addAlert')
+
+    // Mock no version mismatch
+    vi.spyOn(versionStore, 'shouldShowWarning', 'get').mockReturnValue(false)
+
+    useFrontendVersionMismatchWarning()
+
+    expect(addAlertSpy).not.toHaveBeenCalled()
+  })
+
+  it('should show warning immediately when immediate option is true and there is a mismatch', async () => {
+    const toastStore = useToastStore()
+    const versionStore = useVersionCompatibilityStore()
+    const addAlertSpy = vi.spyOn(toastStore, 'addAlert')
+    const dismissWarningSpy = vi.spyOn(versionStore, 'dismissWarning')
+
+    // Mock version mismatch
+    vi.spyOn(versionStore, 'shouldShowWarning', 'get').mockReturnValue(true)
+    vi.spyOn(versionStore, 'warningMessage', 'get').mockReturnValue({
+      type: 'outdated',
+      frontendVersion: '1.0.0',
+      requiredVersion: '2.0.0'
+    })
+
+    useFrontendVersionMismatchWarning({ immediate: true })
+
+    // For immediate: true, the watcher should fire immediately in onMounted
+    await nextTick()
+
+    expect(addAlertSpy).toHaveBeenCalledWith(
+      expect.stringContaining('Version Compatibility Warning')
+    )
+    expect(addAlertSpy).toHaveBeenCalledWith(
+      expect.stringContaining('Frontend version 1.0.0 is outdated')
+    )
+    // Should automatically dismiss the warning
+    expect(dismissWarningSpy).toHaveBeenCalled()
+  })
+
+  it('should not show warning immediately when immediate option is false', async () => {
+    const toastStore = useToastStore()
+    const versionStore = useVersionCompatibilityStore()
+    const addAlertSpy = vi.spyOn(toastStore, 'addAlert')
+
+    // Mock version mismatch
+    vi.spyOn(versionStore, 'shouldShowWarning', 'get').mockReturnValue(true)
+    vi.spyOn(versionStore, 'warningMessage', 'get').mockReturnValue({
+      type: 'outdated',
+      frontendVersion: '1.0.0',
+      requiredVersion: '2.0.0'
+    })
+
+    const result = useFrontendVersionMismatchWarning({ immediate: false })
+    await nextTick()
+
+    // Should not show automatically
+    expect(addAlertSpy).not.toHaveBeenCalled()
+
+    // But should show when called manually
+    result.showWarning()
+    expect(addAlertSpy).toHaveBeenCalledOnce()
+  })
+
+  it('should call showWarning method manually', () => {
+    const toastStore = useToastStore()
+    const versionStore = useVersionCompatibilityStore()
+    const addAlertSpy = vi.spyOn(toastStore, 'addAlert')
+    const dismissWarningSpy = vi.spyOn(versionStore, 'dismissWarning')
+
+    vi.spyOn(versionStore, 'warningMessage', 'get').mockReturnValue({
+      type: 'outdated',
+      frontendVersion: '1.0.0',
+      requiredVersion: '2.0.0'
+    })
+
+    const { showWarning } = useFrontendVersionMismatchWarning()
+    showWarning()
+
+    expect(addAlertSpy).toHaveBeenCalledOnce()
+    expect(dismissWarningSpy).toHaveBeenCalled()
+  })
+
+  it('should expose store methods and computed values', () => {
+    const versionStore = useVersionCompatibilityStore()
+
+    const mockDismissWarning = vi.fn()
+    vi.spyOn(versionStore, 'dismissWarning').mockImplementation(
+      mockDismissWarning
+    )
+    vi.spyOn(versionStore, 'shouldShowWarning', 'get').mockReturnValue(true)
+    vi.spyOn(versionStore, 'hasVersionMismatch', 'get').mockReturnValue(true)
+
+    const result = useFrontendVersionMismatchWarning()
+
+    expect(result.shouldShowWarning.value).toBe(true)
+    expect(result.hasVersionMismatch.value).toBe(true)
+
+    void result.dismissWarning()
+    expect(mockDismissWarning).toHaveBeenCalled()
+  })
+
+  it('should register onMounted hook', () => {
+    useFrontendVersionMismatchWarning()
+
+    expect(mockOnMounted).toHaveBeenCalledOnce()
+  })
+
+  it('should not show warning when warningMessage is null', () => {
+    const toastStore = useToastStore()
+    const versionStore = useVersionCompatibilityStore()
+    const addAlertSpy = vi.spyOn(toastStore, 'addAlert')
+
+    vi.spyOn(versionStore, 'warningMessage', 'get').mockReturnValue(null)
+
+    const { showWarning } = useFrontendVersionMismatchWarning()
+    showWarning()
+
+    expect(addAlertSpy).not.toHaveBeenCalled()
+  })
+
+  it('should only show warning once even if called multiple times', () => {
+    const toastStore = useToastStore()
+    const versionStore = useVersionCompatibilityStore()
+    const addAlertSpy = vi.spyOn(toastStore, 'addAlert')
+
+    vi.spyOn(versionStore, 'warningMessage', 'get').mockReturnValue({
+      type: 'outdated',
+      frontendVersion: '1.0.0',
+      requiredVersion: '2.0.0'
+    })
+
+    const { showWarning } = useFrontendVersionMismatchWarning()
+
+    // Call showWarning multiple times
+    showWarning()
+    showWarning()
+    showWarning()
+
+    // Should only have been called once
+    expect(addAlertSpy).toHaveBeenCalledTimes(1)
+  })
+})
diff --git a/tests-ui/tests/store/systemStatsStore.test.ts b/tests-ui/tests/store/systemStatsStore.test.ts
index 3376a19c07..84e84ec44a 100644
--- a/tests-ui/tests/store/systemStatsStore.test.ts
+++ b/tests-ui/tests/store/systemStatsStore.test.ts
@@ -41,6 +41,7 @@ describe('useSystemStatsStore', () => {
           embedded_python: false,
           comfyui_version: '1.0.0',
           pytorch_version: '2.0.0',
+          required_frontend_version: '1.24.0',
           argv: [],
           ram_total: 16000000000,
           ram_free: 8000000000
@@ -92,6 +93,32 @@ describe('useSystemStatsStore', () => {
 
       expect(store.isLoading).toBe(false)
     })
+
+    it('should handle system stats updates', async () => {
+      const updatedStats = {
+        system: {
+          os: 'Windows',
+          python_version: '3.11.0',
+          embedded_python: false,
+          comfyui_version: '1.1.0',
+          pytorch_version: '2.1.0',
+          required_frontend_version: '1.25.0',
+          argv: [],
+          ram_total: 16000000000,
+          ram_free: 7000000000
+        },
+        devices: []
+      }
+
+      vi.mocked(api.getSystemStats).mockResolvedValue(updatedStats)
+
+      await store.fetchSystemStats()
+
+      expect(store.systemStats).toEqual(updatedStats)
+      expect(store.isLoading).toBe(false)
+      expect(store.error).toBeNull()
+      expect(api.getSystemStats).toHaveBeenCalled()
+    })
   })
 
   describe('getFormFactor', () => {
diff --git a/tests-ui/tests/store/versionCompatibilityStore.test.ts b/tests-ui/tests/store/versionCompatibilityStore.test.ts
new file mode 100644
index 0000000000..e3d3ceca99
--- /dev/null
+++ b/tests-ui/tests/store/versionCompatibilityStore.test.ts
@@ -0,0 +1,321 @@
+import { createPinia, setActivePinia } from 'pinia'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { ref } from 'vue'
+
+import { useSystemStatsStore } from '@/stores/systemStatsStore'
+import { useVersionCompatibilityStore } from '@/stores/versionCompatibilityStore'
+
+vi.mock('@/config', () => ({
+  default: {
+    app_version: '1.24.0'
+  }
+}))
+
+vi.mock('@/stores/systemStatsStore')
+
+// Mock useStorage from VueUse
+const mockDismissalStorage = ref({} as Record<string, number>)
+vi.mock('@vueuse/core', () => ({
+  useStorage: vi.fn(() => mockDismissalStorage)
+}))
+
+describe('useVersionCompatibilityStore', () => {
+  let store: ReturnType<typeof useVersionCompatibilityStore>
+  let mockSystemStatsStore: any
+
+  beforeEach(() => {
+    setActivePinia(createPinia())
+
+    // Clear the mock dismissal storage
+    mockDismissalStorage.value = {}
+
+    mockSystemStatsStore = {
+      systemStats: null,
+      fetchSystemStats: vi.fn()
+    }
+
+    vi.mocked(useSystemStatsStore).mockReturnValue(mockSystemStatsStore)
+
+    store = useVersionCompatibilityStore()
+  })
+
+  afterEach(() => {
+    vi.clearAllMocks()
+  })
+
+  describe('version compatibility detection', () => {
+    it('should detect frontend is outdated when required version is higher', async () => {
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.25.0',
+          required_frontend_version: '1.25.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.isFrontendOutdated).toBe(true)
+      expect(store.isFrontendNewer).toBe(false)
+      expect(store.hasVersionMismatch).toBe(true)
+    })
+
+    it('should not warn when frontend is newer than backend', async () => {
+      // Frontend: 1.24.0, Backend: 1.23.0, Required: 1.23.0
+      // Frontend meets required version, no warning needed
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.23.0',
+          required_frontend_version: '1.23.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.isFrontendOutdated).toBe(false)
+      expect(store.isFrontendNewer).toBe(false)
+      expect(store.hasVersionMismatch).toBe(false)
+    })
+
+    it('should not detect mismatch when versions are compatible', async () => {
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.24.0',
+          required_frontend_version: '1.24.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.isFrontendOutdated).toBe(false)
+      expect(store.isFrontendNewer).toBe(false)
+      expect(store.hasVersionMismatch).toBe(false)
+    })
+
+    it('should handle missing version information gracefully', async () => {
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '',
+          required_frontend_version: ''
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.isFrontendOutdated).toBe(false)
+      expect(store.isFrontendNewer).toBe(false)
+      expect(store.hasVersionMismatch).toBe(false)
+    })
+
+    it('should not detect mismatch when versions are not valid semver', async () => {
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '080e6d4af809a46852d1c4b7ed85f06e8a3a72be', // git hash
+          required_frontend_version: 'not-a-version' // invalid semver format
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.isFrontendOutdated).toBe(false)
+      expect(store.isFrontendNewer).toBe(false)
+      expect(store.hasVersionMismatch).toBe(false)
+    })
+
+    it('should not warn when frontend exceeds required version', async () => {
+      // Frontend: 1.24.0 (from mock config)
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.22.0', // Backend is older
+          required_frontend_version: '1.23.0' // Required is 1.23.0, frontend 1.24.0 meets this
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.isFrontendOutdated).toBe(false) // Frontend 1.24.0 >= Required 1.23.0
+      expect(store.isFrontendNewer).toBe(false) // Never warns about being newer
+      expect(store.hasVersionMismatch).toBe(false)
+    })
+  })
+
+  describe('warning display logic', () => {
+    it('should show warning when there is a version mismatch and not dismissed', async () => {
+      // No dismissals in storage
+      mockDismissalStorage.value = {}
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.25.0',
+          required_frontend_version: '1.25.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.shouldShowWarning).toBe(true)
+    })
+
+    it('should not show warning when dismissed', async () => {
+      const futureTime = Date.now() + 1000000
+      // Set dismissal in reactive storage
+      mockDismissalStorage.value = {
+        '1.24.0-1.25.0-1.25.0': futureTime
+      }
+
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.25.0',
+          required_frontend_version: '1.25.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.shouldShowWarning).toBe(false)
+    })
+
+    it('should not show warning when no version mismatch', async () => {
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.24.0',
+          required_frontend_version: '1.24.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.shouldShowWarning).toBe(false)
+    })
+  })
+
+  describe('warning messages', () => {
+    it('should generate outdated message when frontend is outdated', async () => {
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.25.0',
+          required_frontend_version: '1.25.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.warningMessage).toEqual({
+        type: 'outdated',
+        frontendVersion: '1.24.0',
+        requiredVersion: '1.25.0'
+      })
+    })
+
+    it('should return null when no mismatch', async () => {
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.24.0',
+          required_frontend_version: '1.24.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+
+      expect(store.warningMessage).toBeNull()
+    })
+  })
+
+  describe('dismissal persistence', () => {
+    it('should save dismissal to reactive storage with expiration', async () => {
+      const mockNow = 1000000
+      vi.spyOn(Date, 'now').mockReturnValue(mockNow)
+
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.25.0',
+          required_frontend_version: '1.25.0'
+        }
+      }
+
+      await store.checkVersionCompatibility()
+      store.dismissWarning()
+
+      // Check that the dismissal was added to reactive storage
+      expect(mockDismissalStorage.value).toEqual({
+        '1.24.0-1.25.0-1.25.0': mockNow + 7 * 24 * 60 * 60 * 1000
+      })
+    })
+
+    it('should check dismissal state from reactive storage', async () => {
+      const futureTime = Date.now() + 1000000 // Still valid
+      mockDismissalStorage.value = {
+        '1.24.0-1.25.0-1.25.0': futureTime
+      }
+
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.25.0',
+          required_frontend_version: '1.25.0'
+        }
+      }
+
+      await store.initialize()
+
+      expect(store.shouldShowWarning).toBe(false)
+    })
+
+    it('should show warning if dismissal has expired', async () => {
+      const pastTime = Date.now() - 1000 // Expired
+      mockDismissalStorage.value = {
+        '1.24.0-1.25.0-1.25.0': pastTime
+      }
+
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.25.0',
+          required_frontend_version: '1.25.0'
+        }
+      }
+
+      await store.initialize()
+
+      expect(store.shouldShowWarning).toBe(true)
+    })
+
+    it('should show warning for different version combinations even if previous was dismissed', async () => {
+      const futureTime = Date.now() + 1000000
+      // Dismissed for different version combination (1.25.0) but current is 1.26.0
+      mockDismissalStorage.value = {
+        '1.24.0-1.25.0-1.25.0': futureTime // Different version was dismissed
+      }
+
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.26.0',
+          required_frontend_version: '1.26.0'
+        }
+      }
+
+      await store.initialize()
+
+      expect(store.shouldShowWarning).toBe(true)
+    })
+  })
+
+  describe('initialization', () => {
+    it('should fetch system stats if not available', async () => {
+      mockSystemStatsStore.systemStats = null
+
+      await store.initialize()
+
+      expect(mockSystemStatsStore.fetchSystemStats).toHaveBeenCalled()
+    })
+
+    it('should not fetch system stats if already available', async () => {
+      mockSystemStatsStore.systemStats = {
+        system: {
+          comfyui_version: '1.24.0',
+          required_frontend_version: '1.24.0'
+        }
+      }
+
+      await store.initialize()
+
+      expect(mockSystemStatsStore.fetchSystemStats).not.toHaveBeenCalled()
+    })
+  })
+})