diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index c488593086..9bd030aebb 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -196,10 +196,21 @@
       "dev": true
     },
     "async": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
-      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
-      "dev": true
+      "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
+        }
+      }
     },
     "async-foreach": {
       "version": "0.1.3",
@@ -2035,6 +2046,12 @@
         "tiny-lr": "^0.2.1"
       },
       "dependencies": {
+        "async": {
+          "version": "1.5.2",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+          "dev": true
+        },
         "lodash": {
           "version": "3.10.1",
           "resolved": "https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz",
@@ -2126,6 +2143,12 @@
         "which": "~1.2.1"
       },
       "dependencies": {
+        "async": {
+          "version": "1.5.2",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+          "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+          "dev": true
+        },
         "lodash": {
           "version": "4.3.0",
           "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.3.0.tgz",
diff --git a/package.json b/package.json
index 102c8b9332..5d2a29a8fe 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "private": true,
   "description": "Moodle",
   "devDependencies": {
-    "async": "1.5.2",
+    "async": "2.6.4",
     "eslint": "4.6.1",
     "eslint-plugin-promise": "3.5.0",
     "gherkin-lint": "1.1.3",