diff --git a/requirements.txt b/requirements.txt
index 67299c4..8beeb53 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 py-dateutil
+websocket-client<=0.47.0; python_version == '2.6'
 docker<=2.6; python_version == '2.6'
 docker>=2; python_version >= '2.7'
 jsonpath_rw