diff --git a/package-lock.json b/package-lock.json
index 5c569a7..f0d8f25 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7069,19 +7069,18 @@
       "dev": true
     },
     "uglify-js": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
-      "integrity": "sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==",
+      "version": "3.9.1",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.1.tgz",
+      "integrity": "sha512-JUPoL1jHsc9fOjVFHdQIhqEEJsQvfKDjlubcCilu8U26uZ73qOg8VsN8O1jbuei44ZPlwL7kmbAdM4tzaUvqnA==",
       "dev": true,
       "requires": {
-        "commander": "~2.20.0",
-        "source-map": "~0.6.1"
+        "commander": "~2.20.3"
       },
       "dependencies": {
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+        "commander": {
+          "version": "2.20.3",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+          "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
           "dev": true
         }
       }
diff --git a/package.json b/package.json
index 32db0cc..93ea9b8 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "ts-loader": "^6.0.4",
     "typedoc": "^0.15.0",
     "typescript": "^3.5.3",
-    "uglify-js": "^3.3.21",
+    "uglify-js": "^3.9.1",
     "watch": "^1.0.2",
     "webpack": "^4.39.2",
     "webpack-cli": "^3.3.7"