diff --git a/package-lock.json b/package-lock.json
index 222934d..97fdebc 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -1024,6 +1079,15 @@
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-        "exit": "~0.1.1",
-        "getobject": "~0.1.0",
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@@ -1351,6 +1432,15 @@
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@@ -2802,6 +2994,15 @@
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       "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
@@ -2838,12 +3039,12 @@
       "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo="
     },
     "underscore.string": {
-      "version": "3.3.5",
-      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.5.tgz",
-      "integrity": "sha512-g+dpmgn+XBneLmXXo+sGlW5xQEt4ErkS3mgeN2GFbremYeMBSJKr9Wf2KJplQVaiPY/f7FN6atosWYNm9ovrYg==",
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.6.tgz",
+      "integrity": "sha512-VoC83HWXmCrF6rgkyxS9GHv8W9Q5nhMKho+OadDJGzL2oDYbYEppBaCMH6pFlwLeqj2QS+hhkw2kpXkSdD1JxQ==",
       "dev": true,
       "requires": {
-        "sprintf-js": "^1.0.3",
+        "sprintf-js": "^1.1.1",
         "util-deprecate": "^1.0.2"
       }
     },
diff --git a/package.json b/package.json
index 096df77..3057468 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "puppeteer": "^3.0.4"
   },
   "devDependencies": {
-    "grunt": "^1.3.0",
+    "grunt": "^1.5.3",
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-jshint": "^2.1.0",