diff --git a/requirements.txt b/requirements.txt
index b35c18a..bd6b576 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,10 +7,10 @@ argparse
 Babel>=1.3
 python-glanceclient>=0.15.0
 python-ironicclient>=0.2.1
-python-keystoneclient>=0.11.1
+python-keystoneclient>=1.1.0
 python-neutronclient>=2.3.6,<3
-python-novaclient>=2.18.0
+python-novaclient>=2.18.0,!=2.21.0
 oslo.config>=1.6.0  # Apache-2.0
-oslo.i18n>=1.0.0  # Apache-2.0
+oslo.i18n>=1.3.0  # Apache-2.0
 pyOpenSSL>=0.11
 six>=1.7.0