diff --git a/package-lock.json b/package-lock.json
index 469e1f8..c6af78c 100644
--- a/package-lock.json
+++ b/package-lock.json
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+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.7.tgz",
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+        }
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@@ -3883,6 +4630,12 @@
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+      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
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-      "resolved": "https://registry.npmjs.org/through2/-/through2-1.1.1.tgz",
-      "integrity": "sha1-CEfLxESfNAVXTb3M2buEG4OsNUU=",
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+      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
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-          "dev": true
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+        "readable-stream": "~2.3.6",
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@@ -3996,32 +4733,9 @@
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-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
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-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.4.24.tgz",
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-      "requires": {
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-        "source-map": "0.1.34",
-        "uglify-to-browserify": "~1.0.0",
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-          "integrity": "sha1-p8/omux7FoLDsZjQrPtH19CQVms=",
-          "dev": true,
-          "requires": {
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@@ -4029,15 +4743,34 @@
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-      "resolved": "https://registry.npmjs.org/umd/-/umd-2.1.0.tgz",
-      "integrity": "sha1-SmMHt2LxfwLSAbX6FU5nM5bCY88=",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/umd/-/umd-3.0.3.tgz",
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+      "dev": true
+    },
+    "unbox-primitive": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.2.tgz",
+      "integrity": "sha512-61pPlCD9h51VoreyJ0BReideM3MDKMKnh6+V9L08331ipq6Q8OFXZYiqP6n/tbHx4s5I9uRhcye6BrbkizkBDw==",
+      "dev": true,
+      "requires": {
+        "call-bind": "^1.0.2",
+        "has-bigints": "^1.0.2",
+        "has-symbols": "^1.0.3",
+        "which-boxed-primitive": "^1.0.2"
+      }
+    },
+    "undeclared-identifiers": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/undeclared-identifiers/-/undeclared-identifiers-1.1.3.tgz",
+      "integrity": "sha512-pJOW4nxjlmfwKApE4zvxLScM/njmwj/DiUBv7EabwE4O8kRUy+HIwxQtZLBPll/jx1LJyBcqNfB3/cpv9EZwOw==",
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-        "rfile": "~1.0.0",
-        "ruglify": "~1.0.0",
-        "through": "~2.3.4",
-        "uglify-js": "~2.4.0"
+        "acorn-node": "^1.3.0",
+        "dash-ast": "^1.0.0",
+        "get-assigned-identifiers": "^1.2.0",
+        "simple-concat": "^1.0.0",
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@@ -4143,9 +4876,9 @@
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-      "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz",
-      "integrity": "sha1-Ah5NnHcF8hu/N9A861h2dAJ3TGQ=",
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
+      "integrity": "sha512-kbailJa29QrtXnxgq+DdCEGlbTeYM2eJUxsz6vjZavrCYPMIFHMKQmSKYAIuUK2i7hgPm28a8piX5NTUtM/LKQ==",
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@@ -4155,7 +4888,7 @@
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-          "integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0=",
+          "integrity": "sha512-RofWgt/7fL5wP1Y7fxE7/EmTLzQVnB0ycyibJ0OOHIlJqTNzglYFxVwETOcIoJqJmpDXJ9xImDv+Fq34F/d4Dw==",
           "dev": true
         }
       }
@@ -4335,6 +5068,33 @@
         }
       }
     },
+    "which-boxed-primitive": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz",
+      "integrity": "sha512-bwZdv0AKLpplFY2KZRX6TvyuN7ojjr7lwkg6ml0roIy9YeuSr7JS372qlNW18UQYzgYK9ziGcerWqZOmEn9VNg==",
+      "dev": true,
+      "requires": {
+        "is-bigint": "^1.0.1",
+        "is-boolean-object": "^1.1.0",
+        "is-number-object": "^1.0.4",
+        "is-string": "^1.0.5",
+        "is-symbol": "^1.0.3"
+      }
+    },
+    "which-typed-array": {
+      "version": "1.1.8",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.8.tgz",
+      "integrity": "sha512-Jn4e5PItbcAHyLoRDwvPj1ypu27DJbtdYXUa5zsinrUx77Uvfb0cXwwnGMTn7cjUfhhqgVQnVJCwF+7cgU7tpw==",
+      "dev": true,
+      "requires": {
+        "available-typed-arrays": "^1.0.5",
+        "call-bind": "^1.0.2",
+        "es-abstract": "^1.20.0",
+        "for-each": "^0.3.3",
+        "has-tostringtag": "^1.0.0",
+        "is-typed-array": "^1.1.9"
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     "window-size": {
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       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
@@ -4354,30 +5114,10 @@
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-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-3.0.0.tgz",
-      "integrity": "sha1-XM50B7r2Qsunvs2laBEcST9ZZlo=",
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
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-    "yargs": {
-      "version": "3.5.4",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.5.4.tgz",
-      "integrity": "sha1-2K/49mXpTDS9JZvevRv68N3TU2E=",
-      "dev": true,
-      "requires": {
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-          "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
-          "dev": true
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   }
 }
diff --git a/package.json b/package.json
index 48ee1fd..f302be8 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "source-map": "^0.6.0"
   },
   "devDependencies": {
-    "browserify": "^4.2.3",
+    "browserify": "^17.0.0",
     "coffeescript": "^1.12.7",
     "http-server": "^0.11.1",
     "mocha": "^3.5.3",