diff --git a/package.json b/package.json
index 603067086..28b09f46e 100644
--- a/package.json
+++ b/package.json
@@ -86,7 +86,7 @@
     },
     "devDependencies": {
         "dompurify": "2.3.6",
-        "grunt": "^1.5.2",
+        "grunt": "1.5.2",
         "grunt-chmod": "~1.1.1",
         "grunt-cli": "~1.4.3",
         "grunt-concurrent": "3.0.0",