diff --git a/package.json b/package.json
index ddb9023e..8e160cb3 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "prettier": "1.19.1",
     "require-dir": "1.2.0",
     "uglify-es": "3.3.9",
-    "uglify-js": "3.7.5",
+    "uglify-js": "3.9.2",
     "yargs-parser": "17.0.0",
     "yarn": "1.22.0"
   },
diff --git a/yarn.lock b/yarn.lock
index d1251a1a..9f9285d5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7219,13 +7219,12 @@ uglify-es@3.3.9:
     commander "~2.13.0"
     source-map "~0.6.1"
 
-uglify-js@3.7.5:
-  version "3.7.5"
-  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.7.5.tgz#278c7c24927ac5a32d3336fc68fd4ae1177a486a"
-  integrity sha512-GFZ3EXRptKGvb/C1Sq6nO1iI7AGcjyqmIyOw0DrD0675e+NNbGO72xmMM2iEBdFbxaTLo70NbjM/Wy54uZIlsg==
+uglify-js@3.9.2:
+  version "3.9.2"
+  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.9.2.tgz#012b74fb6a2e440d9ba1f79110a479d3b1f2d48d"
+  integrity sha512-zGVwKslUAD/EeqOrD1nQaBmXIHl1Vw371we8cvS8I6mYK9rmgX5tv8AAeJdfsQ3Kk5mGax2SVV/AizxdNGhl7Q==
   dependencies:
     commander "~2.20.3"
-    source-map "~0.6.1"
 
 uglify-js@^2.8.22:
   version "2.8.29"