diff --git a/package.json b/package.json
index 0aa77d0..ffa7a64 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
   "dependencies": {
     "axios": "1.6.8",
     "chess.js": "^1.0.0-beta.6",
-    "express": "4.19.2",
+    "express": "4.21.0",
     "ndjson": "^2.0.0",
     "oboe": "^2.1.5",
     "prettier": "3.2.5"