diff --git a/package.json b/package.json
index 984ba49..3de84c5 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "url": "https://github.com/foundation/supercollider/issues"
   },
   "dependencies": {
-    "async": "^0.9.0",
+    "async": "^2.6.4",
     "chalk": "^1.1.1",
     "commander": "^2.8.1",
     "escape-html": "^1.0.3",
diff --git a/yarn.lock b/yarn.lock
index 6ea0e68..b52ab10 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -158,10 +158,12 @@ assertion-error@^1.0.1:
   resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
   integrity sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==
 
-async@^0.9.0:
-  version "0.9.2"
-  resolved "https://registry.yarnpkg.com/async/-/async-0.9.2.tgz#aea74d5e61c1f899613bf64bda66d4c78f2fd17d"
-  integrity sha1-rqdNXmHB+JlhO/ZL2mbUx48v0X0=
+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"
 
 babel-runtime@^6.22.0, babel-runtime@^6.26.0:
   version "6.26.0"