diff --git a/requirements.txt b/requirements.txt
index 3092ee47..77d6f4d7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,15 +3,15 @@
 # process, which may cause wedges in the gate later.
 argparse
 pbr>=1.6
-Babel>=1.3
+Babel!=2.3.0,!=2.3.1,!=2.3.2,!=2.3.3,>=1.3 # BSD
 oslo.config>=2.3.0 # Apache-2.0
 oslo.i18n>=1.5.0 # Apache-2.0
 oslo.serialization>=1.4.0 # Apache-2.0
 oslo.utils!=2.6.0,>=2.0.0 # Apache-2.0
 iso8601>=0.1.9
 requests!=2.8.0,!=2.9.0,>=2.5.2
-PrettyTable>=0.7,<0.8
-python-keystoneclient!=1.8.0,>=1.6.0
+PrettyTable<0.8,>=0.7
+python-keystoneclient!=1.8.0,<3.0.0,>=1.6.0
 PyYAML>=3.1.0
 stevedore>=1.5.0 # Apache-2.0
 six>=1.9.0