diff --git a/nh_eobs_mobile/static/dev/less/package.json b/nh_eobs_mobile/static/dev/less/package.json
index 8ddbd88c..518a9c3e 100644
--- a/nh_eobs_mobile/static/dev/less/package.json
+++ b/nh_eobs_mobile/static/dev/less/package.json
@@ -3,7 +3,7 @@
   "description": "CSS & Style Guide for the Open-eObs product",
   "author": "Colin Wren (Neovahealth) <colin@neovahealth.co.uk>",
   "dependencies": {
-    "gulp": "3.9.0",
+    "gulp": "4.0.0",
     "del": "1.1.1",
     "less": "2.5.1",
     "gulp-kss": "0.0.2",