diff --git a/package-lock.json b/package-lock.json
index 6082337..13b805d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "@devvit/public-api": "0.12.0"
       },
       "devDependencies": {
-        "typescript": "5.8.3",
+        "typescript": "5.9.3",
         "vitest": "^3.2.4"
       }
     },
@@ -1507,9 +1507,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.8.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.8.3.tgz",
-      "integrity": "sha512-p1diW6TqL9L07nNxvRMM7hMMw4c5XOo/1ibL4aAIGmSAt9slTE1Xgw5KWuof2uTOvCg9BY7ZRi+GaF+7sfgPeQ==",
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
diff --git a/package.json b/package.json
index c306e2a..006b121 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "@devvit/public-api": "0.12.0"
   },
   "devDependencies": {
-    "typescript": "5.8.3",
+    "typescript": "5.9.3",
     "vitest": "^3.2.4"
   }
 }