diff --git a/package.json b/package.json
index 874b9249..7366ed02 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
   "license": "MIT",
   "dependencies": {
     "async": "2.1.4",
-    "bignum": "^0.12.5",
+    "bignum": "^0.13.1",
     "bluebird": "3.4.7",
     "body-parser": "^1.16.0",
     "bufferutil": "^1.3.0",