diff --git a/package-lock.json b/package-lock.json
index 5e363b1b..e07f1b51 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1205,12 +1205,12 @@
       "dev": true
     },
     "async": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
-      "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "dev": true,
       "requires": {
-        "lodash": "^4.14.0"
+        "lodash": "^4.17.14"
       }
     },
     "async-each": {
diff --git a/package.json b/package.json
index a8a951e4..de1ce643 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
   "devDependencies": {
     "@nomiclabs/buidler": "^1.3.2",
     "@nomiclabs/buidler-ethers": "^1.3.2",
-    "async": "2.6.0",
+    "async": "2.6.4",
     "chai": "^4.2.0",
     "chromedriver": "^75.0",
     "copy-webpack-plugin": "4.5.1",