diff --git a/.jscsrc b/.jscsrc
index 5b6f4bd40b..449793d3b0 100644
--- a/.jscsrc
+++ b/.jscsrc
@@ -1,5 +1,6 @@
 {
 	"preset": "wikimedia",
 
-	"requireSpacesInsideArrayBrackets": null
+	"requireSpacesInsideArrayBrackets": null,
+	"disallowMixedSpacesAndTabs": null
 }
diff --git a/package.json b/package.json
index 68f33979f1..7bb43f0e6c 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,6 @@
     "grunt-contrib-csslint": "0.4.0",
     "grunt-contrib-jshint": "0.11.0",
     "grunt-contrib-watch": "0.6.1",
-    "grunt-jscs": "1.2.0"
+    "grunt-jscs": "1.5.0"
   }
 }