diff --git a/firefox-extension/package.json b/firefox-extension/package.json
index 7d3d594c..3fbd1bd9 100644
--- a/firefox-extension/package.json
+++ b/firefox-extension/package.json
@@ -33,7 +33,7 @@
     "c8": "^10.1.3",
     "eslint": "^10.0.3",
     "tsx": "^4.21.0",
-    "typescript": "^5.9.3",
+    "typescript": "^6.0.3",
     "typescript-eslint": "^8.20.0",
     "web-ext": "10.1.0",
     "webextension-polyfill": "^0.12.0"