diff --git a/package-lock.json b/package-lock.json
index 74f28d4d9..d6a793f4c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11653,9 +11653,9 @@
       }
     },
     "uglify-js": {
-      "version": "3.9.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.0.tgz",
-      "integrity": "sha512-j5wNQBWaql8gr06dOUrfaohHlscboQZ9B8sNsoK5o4sBjm7Ht9dxSbrMXyktQpA16Acaij8AcoozteaPYZON0g==",
+      "version": "3.9.1",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.1.tgz",
+      "integrity": "sha512-JUPoL1jHsc9fOjVFHdQIhqEEJsQvfKDjlubcCilu8U26uZ73qOg8VsN8O1jbuei44ZPlwL7kmbAdM4tzaUvqnA==",
       "dev": true,
       "requires": {
         "commander": "~2.20.3"
diff --git a/package.json b/package.json
index fd267a94f..89a759e7f 100644
--- a/package.json
+++ b/package.json
@@ -70,7 +70,7 @@
     "pad-right": "0.2.2",
     "standard": "14.3.3",
     "sylvester": "0.0.21",
-    "uglify-js": "3.9.0",
+    "uglify-js": "3.9.1",
     "underscore": "1.10.2",
     "webpack": "4.42.1",
     "zeros": "1.0.0"