diff --git a/package-lock.json b/package-lock.json
index 3682c9c..5e72909 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -123,9 +123,9 @@
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c="
     },
     "async": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "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"
diff --git a/package.json b/package.json
index 75624d3..1ea91b2 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "url": "https://github.com/stephenharris/Event-Organiser/issues"
   },
   "devDependencies": {
-    "async": "^2.0.1",
+    "async": "^2.6.4",
     "crypto": "0.0.3",
     "fs": "0.0.1-security",
     "grunt": "^0.4.5",