diff --git a/package-lock.json b/package-lock.json
index 9e2a2cd..0e961f2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -378,12 +378,12 @@
       "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==",
       "dev": true,
       "requires": {
-        "lodash": "^4.17.11"
+        "lodash": "^4.17.14"
       }
     },
     "async-limiter": {
diff --git a/package.json b/package.json
index 9b16e8b..b1a8291 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "humanize-duration": "3.18.0"
   },
   "devDependencies": {
-    "async": "^2.6.2",
+    "async": "^2.6.4",
     "mocha": "^6.1.4",
     "nyc": "^14.1.0",
     "serverless-google-cloudfunctions": "^2.3.2",