diff --git a/package-lock.json b/package-lock.json
index 54bfc8a..7de1cb1 100644
--- a/package-lock.json
+++ b/package-lock.json
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-                    "integrity": "sha1-ay6YIrGizgpgq2TWEOzK1TyyTQ8=",
-                    "dev": true,
-                    "requires": {
-                        "path-exists": "^2.0.0",
-                        "pinkie-promise": "^2.0.0"
-                    }
-                },
-                "path-exists": {
-                    "version": "2.1.0",
-                    "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-2.1.0.tgz",
-                    "integrity": "sha1-D+tsZPD8UY2adU3V77YscCJ2H0s=",
-                    "dev": true,
-                    "requires": {
-                        "pinkie-promise": "^2.0.0"
-                    }
-                }
-            }
-        },
         "readable-stream": {
             "version": "2.3.7",
             "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
@@ -4424,16 +4408,6 @@
                 "resolve": "^1.1.6"
             }
         },
-        "redent": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/redent/-/redent-1.0.0.tgz",
-            "integrity": "sha1-z5Fqsf1fHxbfsggi3W7H9zDCr94=",
-            "dev": true,
-            "requires": {
-                "indent-string": "^2.1.0",
-                "strip-indent": "^1.0.1"
-            }
-        },
         "regenerate": {
             "version": "1.4.0",
             "resolved": "https://registry.npmjs.org/regenerate/-/regenerate-1.4.0.tgz",
@@ -4952,38 +4926,6 @@
             "integrity": "sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=",
             "dev": true
         },
-        "spdx-correct": {
-            "version": "3.1.0",
-            "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
-            "integrity": "sha512-lr2EZCctC2BNR7j7WzJ2FpDznxky1sjfxvvYEyzxNyb6lZXHODmEoJeFu4JupYlkfha1KZpJyoqiJ7pgA1qq8Q==",
-            "dev": true,
-            "requires": {
-                "spdx-expression-parse": "^3.0.0",
-                "spdx-license-ids": "^3.0.0"
-            }
-        },
-        "spdx-exceptions": {
-            "version": "2.2.0",
-            "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz",
-            "integrity": "sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA==",
-            "dev": true
-        },
-        "spdx-expression-parse": {
-            "version": "3.0.0",
-            "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
-            "integrity": "sha512-Yg6D3XpRD4kkOmTpdgbUiEJFKghJH03fiC1OPll5h/0sO6neh2jqRDVHOQ4o/LMea0tgCkbMgea5ip/e+MkWyg==",
-            "dev": true,
-            "requires": {
-                "spdx-exceptions": "^2.1.0",
-                "spdx-license-ids": "^3.0.0"
-            }
-        },
-        "spdx-license-ids": {
-            "version": "3.0.5",
-            "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
-            "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q==",
-            "dev": true
-        },
         "split-string": {
             "version": "3.1.0",
             "resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
@@ -5107,29 +5049,11 @@
                 "ansi-regex": "^2.0.0"
             }
         },
-        "strip-bom": {
-            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
-            "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
-            "dev": true,
-            "requires": {
-                "is-utf8": "^0.2.0"
-            }
-        },
         "strip-eof": {
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
             "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8="
         },
-        "strip-indent": {
-            "version": "1.0.1",
-            "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
-            "integrity": "sha1-DHlipq3vp7vUrDZkYKY4VSrhoKI=",
-            "dev": true,
-            "requires": {
-                "get-stdin": "^4.0.1"
-            }
-        },
         "strip-json-comments": {
             "version": "2.0.1",
             "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
@@ -5140,6 +5064,12 @@
             "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
             "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc="
         },
+        "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
+        },
         "symbol-tree": {
             "version": "3.2.4",
             "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
@@ -5445,12 +5375,6 @@
                 }
             }
         },
-        "trim-newlines": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
-            "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
-            "dev": true
-        },
         "trim-right": {
             "version": "1.0.1",
             "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
@@ -5524,13 +5448,21 @@
             "dev": true
         },
         "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"
+            },
+            "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
+                }
             }
         },
         "union-value": {
@@ -5633,16 +5565,6 @@
                 "homedir-polyfill": "^1.0.1"
             }
         },
-        "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==",
-            "dev": true,
-            "requires": {
-                "spdx-correct": "^3.0.0",
-                "spdx-expression-parse": "^3.0.0"
-            }
-        },
         "verror": {
             "version": "1.10.0",
             "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
diff --git a/package.json b/package.json
index ac7f86d..a5204db 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
         "babel": "~6.23.0",
         "chai": "~4.2.0",
         "eslint": "~4.19.1",
-        "grunt": "^1.0.4",
+        "grunt": "^1.5.3",
         "grunt-babel": "~7.0.0",
         "grunt-cli": "~1.3.2",
         "grunt-contrib-clean": "~2.0.0",
diff --git a/yarn.lock b/yarn.lock
index 08553f0..44f1c2e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2123,7 +2123,7 @@ grunt-systemjs-builder@~1.0.0:
   dependencies:
     systemjs-builder "0.14.11 - 0.16.x"
 
-grunt@^1.0.4:
+grunt@^1.5.3:
   version "1.5.3"
   resolved "https://registry.yarnpkg.com/grunt/-/grunt-1.5.3.tgz#3214101d11257b7e83cf2b38ea173b824deab76a"
   integrity sha512-mKwmo4X2d8/4c/BmcOETHek675uOqw0RuA/zy12jaspWqvTp4+ZeQF1W+OTpcbncnaBsfbQJ6l0l4j+Sn/GmaQ==