diff --git a/sdk/package-lock.json b/sdk/package-lock.json
index 41155de..e99f10d 100644
--- a/sdk/package-lock.json
+++ b/sdk/package-lock.json
@@ -210,11 +210,18 @@
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
     },
     "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"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.21",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+          "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
+        }
       }
     },
     "async-limiter": {
diff --git a/sdk/package.json b/sdk/package.json
index 96ad1f3..d7ecc7b 100644
--- a/sdk/package.json
+++ b/sdk/package.json
@@ -10,7 +10,7 @@
   "license": "MIT",
   "dependencies": {
     "@binance-chain/javascript-sdk": "^2.10.0",
-    "async": "^2.6.2",
+    "async": "^2.6.4",
     "axios": "^0.18.1",
     "bip39": "^3.0.2",
     "compression": "^1.7.4",