diff --git a/test-requirements.txt b/test-requirements.txt
index a6a7a19d..d4d99f68 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -13,7 +13,7 @@ kombu>=3.0.7
 
 # Used for testing zookeeper & backends.
 zake>=0.1.6 # Apache-2.0
-kazoo>=1.3.1
+kazoo>=1.3.1,!=2.1
 
 # Used for testing database persistence backends.
 #