diff --git a/package.json b/package.json
index b1d1551..b938651 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
     "webtorrent-fixtures": "^1.3.0"
   },
   "optionalDependencies": {
-    "bufferutil": "^3.0.0"
+    "bufferutil": "^4.0.0"
   },
   "keywords": [
     "bittorrent",