diff --git a/package-lock.json b/package-lock.json
index 86897c0..1ddc5f2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7107,9 +7107,9 @@
       }
     },
     "readable-stream": {
-      "version": "3.5.0",
-      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.5.0.tgz",
-      "integrity": "sha512-gSz026xs2LfxBPudDuI41V1lka8cxg64E66SGe78zJlsUofOg/yqwezdIcdfwik6B4h8LFmWPA9ef9X3FiNFLA==",
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
+      "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
       "requires": {
         "inherits": "^2.0.3",
         "string_decoder": "^1.1.1",
@@ -8105,11 +8105,11 @@
       "dev": true
     },
     "through2": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/through2/-/through2-3.0.1.tgz",
-      "integrity": "sha512-M96dvTalPT3YbYLaKaCuwu+j06D/8Jfib0o/PxbVt6Amhv3dUAtW6rTV1jPgJSBG83I/e04Y6xkVdVhSRhi0ww==",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/through2/-/through2-4.0.2.tgz",
+      "integrity": "sha512-iOqSav00cVxEEICeD7TjLB1sueEL+81Wpzp2bY17uZjZN0pWZPuo4suZ/61VujxmqSGFfgOcNuTZ85QJwNZQpw==",
       "requires": {
-        "readable-stream": "2 || 3"
+        "readable-stream": "3"
       }
     },
     "through2-filter": {
diff --git a/package.json b/package.json
index 58c7710..08cc9ed 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
   },
   "homepage": "https://github.com/salesforce-ux/gulp-theo",
   "dependencies": {
-    "through2": "^3.0.1"
+    "through2": "^4.0.2"
   },
   "peerDependencies": {
     "theo": "^8.1.3"