diff --git a/package.json b/package.json
index c59d08b5..2f1b5f85 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "basic-auth-connect": "1.0.0",
     "browser-sync": "^2.10.0",
     "consolidate": "0.x",
-    "express": "4.13.3",
+    "express": "4.16.0",
     "express-nunjucks": "^0.9.5",
     "express-writer": "0.0.4",
     "govuk_frontend_toolkit": "^4.2.1",
@@ -22,16 +22,16 @@
     "grunt-contrib-copy": "0.5.0",
     "grunt-contrib-watch": "0.5.3",
     "grunt-nodemon": "0.4.0",
-    "grunt-sass": "^1.1.0",
+    "grunt-sass": "^3.0.0",
     "grunt-text-replace": "0.3.12",
     "hogan.js": "3.0.2",
     "marked": "^0.3.5",
     "merge": "^1.2.0",
     "minimist": "0.0.8",
     "moment": "^2.14.1",
-    "node-sass": "3.3.3",
+    "node-sass": "6.0.1",
     "readdir": "0.0.6",
-    "serve-favicon": "2.3.0",
+    "serve-favicon": "2.4.5",
     "underscore": "^1.8.3"
   }
 }