diff --git a/requirements.txt b/requirements.txt
index 1abb17b..552aad3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 requests==2.22.0
 web3==5.4.0
+websockets>=9.1 # not directly required, pinned by Snyk to avoid a vulnerability