diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index 5a88c2d..2b5bc94
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "govuk-frontend": "^2.3.0",
     "govuk_frontend_toolkit": "^7.5.0",
     "govuk_template_jinja": "^0.24.1",
-    "gulp": "^3.9.1",
+    "gulp": "^5.0.0",
     "gulp-clean": "^0.4.0",
     "gulp-mocha": "^6.0.0",
     "gulp-nodemon": "^2.1.0",