diff --git a/package-lock.json b/package-lock.json
index 32ad399..5f0f217 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -54,10 +54,16 @@
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-      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
-      "integrity": "sha1-DHlipq3vp7vUrDZkYKY4VSrhoKI=",
-      "dev": true,
-      "requires": {
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-      }
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       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-1.0.4.tgz",
@@ -1843,6 +2049,12 @@
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       "dev": true
     },
+    "supports-preserve-symlinks-flag": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
+      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/throttleit/-/throttleit-1.0.0.tgz",
@@ -1857,6 +2069,15 @@
       "dev": true,
       "optional": true
     },
+    "to-regex-range": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
+      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+      "dev": true,
+      "requires": {
+        "is-number": "^7.0.0"
+      }
+    },
     "tough-cookie": {
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       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
@@ -1868,12 +2089,6 @@
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-      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
-      "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
-      "dev": true
-    },
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@@ -1914,12 +2129,30 @@
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-    "underscore.string": {
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-      "resolved": "http://registry.npmjs.org/underscore.string/-/underscore.string-3.2.3.tgz",
-      "integrity": "sha1-gGmSYzZl1eX8tNsfs6hi62jp5to=",
+    "unc-path-regex": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
+      "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo=",
       "dev": true
     },
+    "underscore.string": {
+      "version": "3.3.6",
+      "resolved": "http://registry.npmjs.org/underscore.string/-/underscore.string-3.3.6.tgz",
+      "integrity": "sha512-VoC83HWXmCrF6rgkyxS9GHv8W9Q5nhMKho+OadDJGzL2oDYbYEppBaCMH6pFlwLeqj2QS+hhkw2kpXkSdD1JxQ==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "^1.1.1",
+        "util-deprecate": "^1.0.2"
+      },
+      "dependencies": {
+        "sprintf-js": {
+          "version": "1.1.2",
+          "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.2.tgz",
+          "integrity": "sha512-VE0SOVEHCk7Qc8ulkWw3ntAzXuqf7S2lvwQaDLRnUeIEaKNQJzV6BwmLKhOqT61aGhfUMrXeaBk+oDGCzvhcug==",
+          "dev": true
+        }
+      }
+    },
     "unicode-5.2.0": {
       "version": "0.7.5",
       "resolved": "https://registry.npmjs.org/unicode-5.2.0/-/unicode-5.2.0-0.7.5.tgz",
@@ -1930,8 +2163,7 @@
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       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true,
-      "optional": true
+      "dev": true
     },
     "uuid": {
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@@ -1940,14 +2172,13 @@
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-    "validate-npm-package-license": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
-      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+    "v8flags": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
+      "integrity": "sha512-mH8etigqMfiGWdeXpaaqGfs6BndypxusHHcv2qSHyZkGEznCd/qAXCWWRzeowtL54147cktFOC4P5y+kl8d8Jg==",
       "dev": true,
       "requires": {
-        "spdx-correct": "^3.0.0",
-        "spdx-expression-parse": "^3.0.0"
+        "homedir-polyfill": "^1.0.1"
       }
     },
     "verror": {
diff --git a/package.json b/package.json
index b363780..cbb34ba 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "uglify-js": "2.7.5"
   },
   "devDependencies": {
-    "grunt": "1.0.1",
+    "grunt": "1.5.2",
     "grunt-cli": "1.2.0",
     "grunt-contrib-jshint": "1.1.0",
     "grunt-contrib-copy": "1.0.0",