diff --git a/packages/frontend/libraries/eventsource/package.json b/packages/frontend/libraries/eventsource/package.json
index 82594685d..ee4e5b09f 100644
--- a/packages/frontend/libraries/eventsource/package.json
+++ b/packages/frontend/libraries/eventsource/package.json
@@ -11,7 +11,7 @@
     "@typescript-eslint/eslint-plugin": "8.5.0",
     "@typescript-eslint/parser": "8.5.0",
     "@eslint/js": "9.10.0",
-    "express": "4.19.2",
+    "express": "4.20.0",
     "jest": "29.7.0",
     "jest-mock": "29.7.0",
     "prettier": "3.3.3",