diff --git a/tests/requirements.txt b/tests/requirements.txt
index 0fa34ef..45b1005 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -43,4 +43,4 @@ trie==1.3.8
 urllib3==1.24.1
 vyper==0.1.0b7
 web3==4.8.1
-websockets==6.0
+websockets==9.1