diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index 5a88c2d..e930684
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "cookie-parser": "^1.4.3",
     "cross-spawn": "^6.0.5",
     "dotenv": "^6.0.0",
-    "express": "4.16.3",
+    "express": "4.17.3",
     "express-session": "^1.13.0",
     "express-writer": "0.0.4",
     "govuk-elements-sass": "^3.1.3",