diff --git a/package.json b/package.json
index f7bf8d2d..218d6ecb 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
     "pretty-bytes-cli": "2.0.0",
     "semver": "5.7.0",
     "sinon": "7.3.1",
-    "uglify-js": "3.5.2",
+    "uglify-js": "3.5.4",
     "webpack": "3.12.0",
     "webpack-cli": "3.3.0"
   },
diff --git a/yarn.lock b/yarn.lock
index 6bc42f92..ddc7a6c0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1954,10 +1954,10 @@ commander@^2.11.0, commander@~2.17.1:
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.17.1.tgz#bd77ab7de6de94205ceacc72f1716d29f20a77bf"
   integrity sha512-wPMUt6FnH2yzG95SA6mzjQOEKUU3aLaDEmzs1ti+1E9h+CsrZghRlqEM/EJ4KscsQVG8uNN4uVreUeT8+drlgg==
 
-commander@~2.19.0:
-  version "2.19.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.19.0.tgz#f6198aa84e5b83c46054b94ddedbfed5ee9ff12a"
-  integrity sha512-6tvAOO+D6OENvRAh524Dh9jcfKTYDQAqvqezbCW82xj5X0pSrcpxtvRKHLG0yBY6SD7PSDrJaj+0AiOcKVd1Xg==
+commander@~2.20.0:
+  version "2.20.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
+  integrity sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==
 
 commondir@^1.0.1:
   version "1.0.1"
@@ -8758,12 +8758,12 @@ type-detect@4.0.8:
   resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.0.8.tgz#7646fb5f18871cfbb7749e69bd39a6388eb7450c"
   integrity sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==
 
-uglify-js@3.5.2:
-  version "3.5.2"
-  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.5.2.tgz#dc0c7ac2da0a4b7d15e84266818ff30e82529474"
-  integrity sha512-imog1WIsi9Yb56yRt5TfYVxGmnWs3WSGU73ieSOlMVFwhJCA9W8fqFFMMj4kgDqiS/80LGdsYnWL7O9UcjEBlg==
+uglify-js@3.5.4:
+  version "3.5.4"
+  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.5.4.tgz#4a64d57f590e20a898ba057f838dcdfb67a939b9"
+  integrity sha512-GpKo28q/7Bm5BcX9vOu4S46FwisbPbAmkkqPnGIpKvKTM96I85N6XHQV+k4I6FA2wxgLhcsSyHoNhzucwCflvA==
   dependencies:
-    commander "~2.19.0"
+    commander "~2.20.0"
     source-map "~0.6.1"
 
 uglify-js@^2.6, uglify-js@^2.8.29: