diff --git a/package.json b/package.json
index 2e1f709331..fe896ed318 100644
--- a/package.json
+++ b/package.json
@@ -146,7 +146,7 @@
     "grunt-contrib-compress": "1.6.0",
     "grunt-contrib-copy": "1.0.0",
     "grunt-contrib-symlink": "1.0.0",
-    "grunt-contrib-uglify": "4.0.1",
+    "grunt-contrib-uglify": "5.0.0",
     "grunt-contrib-watch": "1.1.0",
     "grunt-express-server": "0.5.4",
     "grunt-mocha-cli": "6.0.0",
diff --git a/yarn.lock b/yarn.lock
index f458662338..9545c3fe84 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4116,10 +4116,10 @@ grunt-contrib-symlink@1.0.0:
   resolved "https://registry.yarnpkg.com/grunt-contrib-symlink/-/grunt-contrib-symlink-1.0.0.tgz#c83616c035711a6c0062a2810cf1c77ffc6bed2b"
   integrity sha1-yDYWwDVxGmwAYqKBDPHHf/xr7Ss=
 
-grunt-contrib-uglify@4.0.1:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/grunt-contrib-uglify/-/grunt-contrib-uglify-4.0.1.tgz#68a7b62fa045ce8e2c7574d1bdcd3b96b8a686b1"
-  integrity sha512-dwf8/+4uW1+7pH72WButOEnzErPGmtUvc8p08B0eQS/6ON0WdeQu0+WFeafaPTbbY1GqtS25lsHWaDeiTQNWPg==
+grunt-contrib-uglify@5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/grunt-contrib-uglify/-/grunt-contrib-uglify-5.0.0.tgz#04dda8a4f44f4e4a147aa26c6259404fd8097a49"
+  integrity sha512-rIFFPJMWKnh6oxDe2b810Ysg5SKoiI0u/FvuvAVpvJ7VHILkKtGqA4jgJ1JWruWQ+1m5FtB1lVSK81YyzIgDUw==
   dependencies:
     chalk "^2.4.1"
     maxmin "^2.1.0"