diff --git a/src/node/utils/MinifyWorker.js b/src/node/utils/MinifyWorker.js
index 3fb050ccf..aa041a37f 100644
--- a/src/node/utils/MinifyWorker.js
+++ b/src/node/utils/MinifyWorker.js
@@ -3,7 +3,7 @@
  */
 
 var CleanCSS = require('clean-css');
-var terser = require("terser");
+var terser = require("uglify-js");
 var path = require('path');
 var Threads = require('threads')
 
diff --git a/src/package-lock.json b/src/package-lock.json
index 323305ddc..2d6b54831 100644
--- a/src/package-lock.json
+++ b/src/package-lock.json
@@ -892,11 +892,6 @@
       "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=",
       "dev": true
     },
-    "buffer-from": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
-      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A=="
-    },
     "buffer-writer": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/buffer-writer/-/buffer-writer-2.0.0.tgz",
@@ -7677,15 +7672,6 @@
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
       "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
     },
-    "source-map-support": {
-      "version": "0.5.19",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.19.tgz",
-      "integrity": "sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==",
-      "requires": {
-        "buffer-from": "^1.0.0",
-        "source-map": "^0.6.0"
-      }
-    },
     "space-separated-tokens": {
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/space-separated-tokens/-/space-separated-tokens-1.1.5.tgz",
@@ -7981,16 +7967,6 @@
         "readable-stream": "^3.1.1"
       }
     },
-    "terser": {
-      "version": "4.7.0",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.7.0.tgz",
-      "integrity": "sha512-Lfb0RiZcjRDXCC3OSHJpEkxJ9Qeqs6mp2v4jf2MHfy8vGERmVDuvjXdd/EnP5Deme5F2yBRBymKmKHCBg2echw==",
-      "requires": {
-        "commander": "^2.20.0",
-        "source-map": "~0.6.1",
-        "source-map-support": "~0.5.12"
-      }
-    },
     "test-exclude": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -8163,6 +8139,15 @@
         }
       }
     },
+    "uglify-js": {
+      "version": "3.8.1",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.8.1.tgz",
+      "integrity": "sha512-W7KxyzeaQmZvUFbGj4+YFshhVrMBGSg2IbcYAjGWGvx8DHvJMclbTDMpffdxFUGPBHjIytk7KJUR/KUXstUGDw==",
+      "requires": {
+        "commander": "~2.20.3",
+        "source-map": "~0.6.1"
+      }
+    },
     "uid-safe": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/uid-safe/-/uid-safe-2.1.5.tgz",
diff --git a/src/package.json b/src/package.json
index e7783b0c6..3e4b20d58 100644
--- a/src/package.json
+++ b/src/package.json
@@ -51,22 +51,22 @@
     "lodash.clonedeep": "4.5.0",
     "log4js": "0.6.35",
     "measured-core": "1.11.2",
+    "rehype": "^10.0.0",
+    "rehype-format": "^3.0.1",
     "nodeify": "1.0.1",
     "npm": "6.14.5",
     "openapi-backend": "2.4.1",
-    "rehype": "^10.0.0",
-    "rehype-format": "^3.0.1",
     "request": "2.88.2",
     "resolve": "1.1.7",
     "security": "1.0.0",
     "semver": "5.6.0",
     "slide": "1.1.6",
     "socket.io": "2.1.1",
-    "terser": "^4.7.0",
     "threads": "^1.4.0",
     "tiny-worker": "^2.3.0",
     "tinycon": "0.0.1",
     "ueberdb2": "0.4.9",
+    "uglify-js": "3.8.1",
     "underscore": "1.8.3",
     "unorm": "1.4.1"
   },