diff --git a/.npm-upgrade.json b/.npm-upgrade.json
new file mode 100644
index 00000000..33319e6e
--- /dev/null
+++ b/.npm-upgrade.json
@@ -0,0 +1,8 @@
+{
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+      "versions": ">= 2",
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+    }
+  }
+}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index fdc2dbc1..a9c0e047 100644
--- a/package-lock.json
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-          "integrity": "sha512-QMxecFz/gHQwteWwSo5nTc6UaICqN1bMedC5sMtUc7y3Ha3Q8y6ZO0iCR8pq4RJC8Hjf0FEPEHZqcMB/+DFCrA==",
-          "dev": true,
-          "requires": {
-            "cacache": "^12.0.2",
-            "find-cache-dir": "^2.1.0",
-            "is-wsl": "^1.1.0",
-            "schema-utils": "^1.0.0",
-            "serialize-javascript": "^2.1.2",
-            "source-map": "^0.6.1",
-            "terser": "^4.1.2",
-            "webpack-sources": "^1.4.0",
-            "worker-farm": "^1.7.0"
-          }
-        },
-        "y18n": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
-          "dev": true
         }
       }
     },
@@ -11667,9 +11410,9 @@
       "dev": true
     },
     "yallist": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
       "dev": true
     },
     "yargs": {
diff --git a/package.json b/package.json
index 596fb6bb..8b26bde9 100644
--- a/package.json
+++ b/package.json
@@ -84,7 +84,7 @@
     "preact": "8.4.2",
     "stream-combiner2": "1.1.1",
     "style-loader": "0.23.1",
-    "terser-webpack-plugin": "2.3.5",
+    "terser-webpack-plugin": "1.4.3",
     "url-loader": "1.1.2",
     "webpack": "4.42.0",
     "webpack-cli": "3.3.11",