diff --git a/package.json b/package.json
index d37e066497..8d94771ee2 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "specificity": "^0.3.2",
     "sw-precache": "^5.2.0",
     "teepee": "^2.31.1",
-    "uglify-js": "^3.3.0",
+    "uglify-js": "3.3.27",
     "urltools": "^0.4.1",
     "xmldom": "^0.1.27"
   },