diff --git a/package.json b/package.json
index 01ef979..e2e41af 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
   "directories": {},
   "_resolved": "https://registry.npmjs.org/zklib/-/zklib-0.0.7.tgz",
   "dependencies": {
-    "async": "^2.6.0"
+    "async": "^3.2.2"
   },
   "devDependencies": {
     "@types/node": "^10.3.1",
diff --git a/yarn.lock b/yarn.lock
index 799e7da..1b89fd2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -169,12 +169,16 @@ async@^1.4.0:
   version "1.5.2"
   resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
 
-async@^2.1.4, async@^2.6.0:
+async@^2.1.4:
   version "2.6.0"
   resolved "https://registry.yarnpkg.com/async/-/async-2.6.0.tgz#61a29abb6fcc026fea77e56d1c6ec53a795951f4"
   dependencies:
     lodash "^4.14.0"
 
+async@^3.2.2:
+  version "3.2.2"
+  resolved "https://registry.yarnpkg.com/async/-/async-3.2.2.tgz#2eb7671034bb2194d45d30e31e24ec7e7f9670cd"
+
 asynckit@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/asynckit/-/asynckit-0.4.0.tgz#c79ed97f7f34cb8f2ba1bc9790bcc366474b4b79"