diff --git a/package-lock.json b/package-lock.json
index 1153ed29..20875487 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2384,6 +2384,16 @@
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@@ -3261,6 +3274,24 @@
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@@ -6686,6 +6738,33 @@
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@@ -6926,9 +7005,9 @@
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@@ -7309,6 +7388,50 @@
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+          "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.2.0"
+          }
+        },
+        "path-exists": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
+          "integrity": "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==",
           "dev": true
         },
+        "pkg-dir": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-4.2.0.tgz",
+          "integrity": "sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ==",
+          "dev": true,
+          "requires": {
+            "find-up": "^4.0.0"
+          }
+        },
         "schema-utils": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-1.0.0.tgz",
-          "integrity": "sha512-i27Mic4KovM/lnGsy8whRCHhc7VicJajAjTrYg11K9zfZXnYIt4k5F+kZkwjnrhKzLic/HLU4j11mjsz2G/75g==",
+          "version": "2.6.5",
+          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-2.6.5.tgz",
+          "integrity": "sha512-5KXuwKziQrTVHh8j/Uxz+QUbxkaLW9X/86NBlx/gnKgtsZA2GIVMUn17qWhRFwF8jdYb3Dig5hRO/W5mZqy6SQ==",
           "dev": true,
           "requires": {
-            "ajv": "^6.1.0",
-            "ajv-errors": "^1.0.0",
-            "ajv-keywords": "^3.1.0"
+            "ajv": "^6.12.0",
+            "ajv-keywords": "^3.4.1"
           }
         },
-        "serialize-javascript": {
-          "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-2.1.2.tgz",
-          "integrity": "sha512-rs9OggEUF0V4jUSecXazOYsLfu7OGK2qIn3c7IPBiffz32XniEp/TX9Xmc9LQfK2nQ2QKHvZ2oygKUGU0lG4jQ==",
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
           "dev": true
         },
         "source-map": {
@@ -10040,6 +10247,7 @@
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.9.tgz",
       "integrity": "sha512-pcnnhaoG6RtrvHJ1dFncAe8Od6Nuy30oaJ82ts6//sGSXOP5UjBMEthiProjXmMNHOfd93sqlkztifFMcb+4yw==",
       "dev": true,
+      "optional": true,
       "requires": {
         "commander": "~2.20.3",
         "source-map": "~0.6.1"
@@ -10049,49 +10257,8 @@
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
           "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
-      }
-    },
-    "uglifyjs-webpack-plugin": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-2.2.0.tgz",
-      "integrity": "sha512-mHSkufBmBuJ+KHQhv5H0MXijtsoA1lynJt1lXOaotja8/I0pR4L9oGaPIZw+bQBOFittXZg9OC1sXSGO9D9ZYg==",
-      "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": "^1.7.0",
-        "source-map": "^0.6.1",
-        "uglify-js": "^3.6.0",
-        "webpack-sources": "^1.4.0",
-        "worker-farm": "^1.7.0"
-      },
-      "dependencies": {
-        "is-wsl": {
-          "version": "1.1.0",
-          "resolved": "https://registry.npmjs.org/is-wsl/-/is-wsl-1.1.0.tgz",
-          "integrity": "sha1-HxbkqiKwTRM2tmGIpmrzxgDDpm0=",
-          "dev": true
-        },
-        "schema-utils": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-1.0.0.tgz",
-          "integrity": "sha512-i27Mic4KovM/lnGsy8whRCHhc7VicJajAjTrYg11K9zfZXnYIt4k5F+kZkwjnrhKzLic/HLU4j11mjsz2G/75g==",
           "dev": true,
-          "requires": {
-            "ajv": "^6.1.0",
-            "ajv-errors": "^1.0.0",
-            "ajv-keywords": "^3.1.0"
-          }
-        },
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
+          "optional": true
         }
       }
     },
@@ -10398,6 +10565,29 @@
           "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
           "dev": true
         },
+        "cacache": {
+          "version": "12.0.3",
+          "resolved": "https://registry.npmjs.org/cacache/-/cacache-12.0.3.tgz",
+          "integrity": "sha512-kqdmfXEGFepesTuROHMs3MpFLWrPkSSpRqOw80RCflZXy/khxaArvFrQ7uJxSUduzAufc6G0g1VUCOZXxWavPw==",
+          "dev": true,
+          "requires": {
+            "bluebird": "^3.5.5",
+            "chownr": "^1.1.1",
+            "figgy-pudding": "^3.5.1",
+            "glob": "^7.1.4",
+            "graceful-fs": "^4.1.15",
+            "infer-owner": "^1.0.3",
+            "lru-cache": "^5.1.1",
+            "mississippi": "^3.0.0",
+            "mkdirp": "^0.5.1",
+            "move-concurrently": "^1.0.1",
+            "promise-inflight": "^1.0.1",
+            "rimraf": "^2.6.3",
+            "ssri": "^6.0.1",
+            "unique-filename": "^1.1.1",
+            "y18n": "^4.0.0"
+          }
+        },
         "eslint-scope": {
           "version": "4.0.3",
           "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.3.tgz",
@@ -10408,6 +10598,21 @@
             "estraverse": "^4.1.1"
           }
         },
+        "is-wsl": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/is-wsl/-/is-wsl-1.1.0.tgz",
+          "integrity": "sha1-HxbkqiKwTRM2tmGIpmrzxgDDpm0=",
+          "dev": true
+        },
+        "lru-cache": {
+          "version": "5.1.1",
+          "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-5.1.1.tgz",
+          "integrity": "sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w==",
+          "dev": true,
+          "requires": {
+            "yallist": "^3.0.2"
+          }
+        },
         "schema-utils": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-1.0.0.tgz",
@@ -10418,13 +10623,51 @@
             "ajv-errors": "^1.0.0",
             "ajv-keywords": "^3.1.0"
           }
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        },
+        "ssri": {
+          "version": "6.0.1",
+          "resolved": "https://registry.npmjs.org/ssri/-/ssri-6.0.1.tgz",
+          "integrity": "sha512-3Wge10hNcT1Kur4PDFwEieXSCMCJs/7WvSACcrMYrNp+b8kDL1/0wJch5Ni2WrtwEa2IO8OsVfeKIciKCDx/QA==",
+          "dev": true,
+          "requires": {
+            "figgy-pudding": "^3.5.1"
+          }
+        },
+        "terser-webpack-plugin": {
+          "version": "1.4.3",
+          "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-1.4.3.tgz",
+          "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"
+          }
+        },
+        "yallist": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+          "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
+          "dev": true
         }
       }
     },
     "webpack-cli": {
-      "version": "3.3.10",
-      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.10.tgz",
-      "integrity": "sha512-u1dgND9+MXaEt74sJR4PR7qkPxXUSQ0RXYq8x1L6Jg1MYVEmGPrH6Ah6C4arD4r0J1P5HKjRqpab36k0eIzPqg==",
+      "version": "3.3.11",
+      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.11.tgz",
+      "integrity": "sha512-dXlfuml7xvAFwYUPsrtQAA9e4DOe58gnzSxhgrO/ZM/gyXTBowrsYeubyN4mqGhYdpXMFNyQ6emjJS9M7OBd4g==",
       "dev": true,
       "requires": {
         "chalk": "2.4.2",
diff --git a/package.json b/package.json
index 9d14b8ea..81f6cc75 100644
--- a/package.json
+++ b/package.json
@@ -48,20 +48,19 @@
     "karma-chrome-launcher": "^3.0.0",
     "karma-cli": "^2.0.0",
     "karma-coverage-istanbul-reporter": "^2.0.5",
-    "karma-firefox-launcher": "^1.1.0",
+    "karma-firefox-launcher": "^1.3.0",
     "karma-mocha": "^1.3.0",
     "karma-sinon-chai": "^2.0.2",
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^4.0.2",
-    "lolex": "^5.1.1",
     "mocha": "^7.1.0",
     "pdfjs-dist": "2.2.228",
     "sinon": "^7.3.2",
     "sinon-chai": "^3.3.0",
+    "terser-webpack-plugin": "^2.3.5",
     "twitter-text": "^1.13.4",
-    "uglifyjs-webpack-plugin": "^2.1.3",
     "webpack": "^4.34.0",
-    "webpack-cli": "^3.3.4",
+    "webpack-cli": "^3.3.11",
     "webpack-dev-server": "^3.7.2"
   },
   "dependencies": {},
diff --git a/webpack.config.js b/webpack.config.js
index df9125d0..d5c9e7b8 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,21 +1,20 @@
 const path = require('path');
-const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
+const TerserPlugin = require('terser-webpack-plugin');
 
 let fileName = 'pdf-annotate';
-let plugins = [];
+let optimization = {};
 
 if (process.env.MINIFY) {
   fileName += '.min';
-  plugins.push(
-    new UglifyJsPlugin({
-      sourceMap: true
-    })
-  );
+  optimization = {
+    minimize: true,
+    minimizer: [new TerserPlugin()]
+  };
 }
 
 module.exports = {
   devtool: 'source-map',
-  plugins: plugins,
+  optimization: optimization,
   entry: './index.js',
   mode: 'production',
   output: {