diff --git a/package.json b/package.json
index cdb0d30..2a9a4c4 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
   },
   "devDependencies": {
     "c8": "^10.1.2",
-    "express": "^4.18.2",
+    "express": "^5.1.0",
     "express-as-promise": "^2.0.0",
     "is-stream": "^4.0.1",
     "jsdoc-to-markdown": "^9.0.0",