diff --git a/requirements.txt b/requirements.txt
index 352ca990..b05de776 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ gevent==0.13.8
 importlib
 keystonemiddleware>=1.2.0
 kombu
-oslo.serialization>=1.0.0
+oslo.serialization>=1.0.0,<=1.2.0
 pecan>=0.3.0,<0.6.0
 psycopg2>=2.5.1
 stevedore>=0.10