diff --git a/tools/keymaster/requirements.txt b/tools/keymaster/requirements.txt
index 682f1e5dc..9703cc86f 100644
--- a/tools/keymaster/requirements.txt
+++ b/tools/keymaster/requirements.txt
@@ -1,4 +1,5 @@
 click
 python-json-config
 web3
-prometheus_client
\ No newline at end of file
+prometheus_client
+websockets>=10.0 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file