diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index 5ec6fc9..ba100e5
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "govuk-elements-sass": "2.2.1",
     "govuk_frontend_toolkit": "5.0.2",
     "govuk_template_jinja": "0.19.2",
-    "gulp": "^3.9.1",
+    "gulp": "^5.0.0",
     "gulp-clean": "^0.3.2",
     "gulp-mocha": "^3.0.1",
     "gulp-nodemon": "^2.1.0",