diff --git a/package-lock.json b/package-lock.json
index 13d7c0c..965b397 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -236,9 +236,21 @@
       }
     },
     "async": {
-      "version": "0.2.10",
-      "resolved": "https://registry.npmjs.org/async/-/async-0.2.10.tgz",
-      "integrity": "sha1-trvgsGdLnXGXCMo43owjfLUmw9E="
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.14"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.21",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+          "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
+          "dev": true
+        }
+      }
     },
     "asynckit": {
       "version": "0.4.0",
@@ -2244,6 +2256,11 @@
         "through": "2.3.4"
       },
       "dependencies": {
+        "async": {
+          "version": "0.2.10",
+          "resolved": "https://registry.npmjs.org/async/-/async-0.2.10.tgz",
+          "integrity": "sha1-trvgsGdLnXGXCMo43owjfLUmw9E="
+        },
         "lodash": {
           "version": "2.4.2",
           "resolved": "https://registry.npmjs.org/lodash/-/lodash-2.4.2.tgz",
@@ -4632,6 +4649,13 @@
             "source-map": "0.1.34",
             "uglify-to-browserify": "1.0.2",
             "yargs": "3.5.4"
+          },
+          "dependencies": {
+            "async": {
+              "version": "0.2.10",
+              "resolved": "https://registry.npmjs.org/async/-/async-0.2.10.tgz",
+              "integrity": "sha1-trvgsGdLnXGXCMo43owjfLUmw9E="
+            }
           }
         }
       }
@@ -4984,6 +5008,11 @@
         "underscore.string": "2.3.3"
       },
       "dependencies": {
+        "async": {
+          "version": "0.2.10",
+          "resolved": "https://registry.npmjs.org/async/-/async-0.2.10.tgz",
+          "integrity": "sha1-trvgsGdLnXGXCMo43owjfLUmw9E="
+        },
         "glob": {
           "version": "3.2.11",
           "resolved": "https://registry.npmjs.org/glob/-/glob-3.2.11.tgz",
diff --git a/package.json b/package.json
index ec1b01a..db6dd17 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "yeoman-generator": "^0.16.0"
   },
   "devDependencies": {
-    "async": "~0.2.9",
+    "async": "~2.6.4",
     "csslint": "^0.10.0",
     "grunt": "~0.4.1",
     "grunt-contrib-jshint": "~0.8.0",