diff --git a/package.json b/package.json
index af0f805..1f31e0f 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "mocha": "^2.0.1"
   },
   "dependencies": {
-    "bn.js": "^4.0.0",
+    "bn.js": "^5.0.0",
     "brorand": "^1.0.1"
   }
 }