diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index b6b1e22..0f7a8ab
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "browser-sync": "^2.11.1",
     "cross-spawn": "^5.0.0",
     "dotenv": "^4.0.0",
-    "express": "4.13.3",
+    "express": "4.17.1",
     "express-session": "^1.13.0",
     "express-writer": "0.0.4",
     "govuk-elements-sass": "^3.1.1",