diff --git a/package.json b/package.json
index 91e1161e..f06db7f6 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "author": "Jérémy Hagneré <jeremy.hagnere@gmail.com>",
   "license": "MIT",
   "dependencies": {
-    "async": "^2.1.4",
+    "async": "^2.6.4",
     "hash-files": "^1.1.1",
     "image-optimizer": "^0.4.0-pre2",
     "img-loader": "^3.0.1",
diff --git a/yarn.lock b/yarn.lock
index ffac4dfd..6c488556 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -460,10 +460,10 @@ async@^1.2.1, async@^1.5.2:
   resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
   integrity sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=
 
-async@^2.1.4:
-  version "2.6.3"
-  resolved "https://registry.yarnpkg.com/async/-/async-2.6.3.tgz#d72625e2344a3656e3a3ad4fa749fa83299d82ff"
-  integrity sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==
+async@^2.6.4:
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/async/-/async-2.6.4.tgz#706b7ff6084664cd7eae713f6f965433b5504221"
+  integrity sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==
   dependencies:
     lodash "^4.17.14"