diff --git a/package.json b/package.json
index efff5093..acf808ba 100644
--- a/package.json
+++ b/package.json
@@ -71,7 +71,7 @@
     "libmime": "^3.1.0",
     "marked": "^0.3.6",
     "memory-cache": "^0.1.6",
-    "mjml": "^3.3.0",
+    "mjml": "3.3.0",
     "mkdirp": "^0.5.1",
     "moment-timezone": "^0.5.11",
     "morgan": "^1.8.1",