diff --git a/package.json b/package.json
index 47349ae..d461591 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "grunt-autoprefixer": "^3.0.0",
     "grunt-cli": "^1.4.2",
     "grunt-contrib-stylus": "^1.2.0",
-    "grunt-contrib-uglify": "^5.0.1",
+    "grunt-contrib-uglify": "^5.1.0",
     "grunt-contrib-watch": "^1.1.0",
     "grunt-sync": "^0.8.2",
     "mongodb": "^3.6.8",
diff --git a/yarn.lock b/yarn.lock
index 05c92f5..893fee8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1050,14 +1050,14 @@ grunt-contrib-stylus@^1.2.0:
     nib "^1.1.0"
     stylus "^0.54.0"
 
-grunt-contrib-uglify@^5.0.1:
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/grunt-contrib-uglify/-/grunt-contrib-uglify-5.0.1.tgz#d1eeccafdfedc27353e5f610415d18340c568c51"
-  integrity sha512-T/aXZ4WIpAtoswZqb6HROKg7uq9QbKwl+lUuOwK4eoFj3tFv9/a/oMyd3/qvetV29Pbf8P1YYda1gDwZppr60A==
+grunt-contrib-uglify@^5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/grunt-contrib-uglify/-/grunt-contrib-uglify-5.1.0.tgz#42afcca2bd858cb0f423cc1f7f95ab475f4a64e1"
+  integrity sha512-czoxpIWCwDCUy4oKUVz7Nb9aQknBPMsIq4uu4Fz5UX7UTdmU4GwBbefE6yAcgo1bT40Lhciijh8hFd4aqfb3Jg==
   dependencies:
     chalk "^2.4.1"
     maxmin "^2.1.0"
-    uglify-js "^3.13.3"
+    uglify-js "^3.15.2"
     uri-path "^1.0.0"
 
 grunt-contrib-watch@^1.1.0:
@@ -2538,10 +2538,10 @@ type-is@~1.6.17, type-is@~1.6.18:
     media-typer "0.3.0"
     mime-types "~2.1.24"
 
-uglify-js@^3.13.3:
-  version "3.13.3"
-  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.13.3.tgz#ce72a1ad154348ea2af61f50933c76cc8802276e"
-  integrity sha512-otIc7O9LyxpUcQoXzj2hL4LPWKklO6LJWoJUzNa8A17Xgi4fOeDC8FBDOLHnC/Slo1CQgsZMcM6as0M76BZaig==
+uglify-js@^3.15.2:
+  version "3.15.3"
+  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.15.3.tgz#9aa82ca22419ba4c0137642ba0df800cb06e0471"
+  integrity sha512-6iCVm2omGJbsu3JWac+p6kUiOpg3wFO2f8lIXjfEb8RrmLjzog1wTPMmwKB7swfzzqxj9YM+sGUM++u1qN4qJg==
 
 unc-path-regex@^0.1.2:
   version "0.1.2"