diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index e3bf179..7c1d719 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -1025,11 +1025,11 @@
       "dev": true
     },
     "async": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.2.tgz",
-      "integrity": "sha512-H1qVYh1MYhEEFLsP97cVKqCGo7KfCyTt6uEWqsTBr9SO84oK9Uwbyd/yCW+6rKJLHksBNUVWZDAjfS+Ccx0Bbg==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "requires": {
-        "lodash": "^4.17.11"
+        "lodash": "^4.17.14"
       }
     },
     "async-done": {
diff --git a/package.json b/package.json
index 995b45e..b472c97 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
   },
   "dependencies": {
     "abstract-leveldown": "3.0.0",
-    "async": "2.6.2",
+    "async": "2.6.4",
     "bip39": "2.5.0",
     "cachedown": "1.0.0",
     "clone": "2.1.2",