diff --git a/doc/requirements.txt b/doc/requirements.txt
index 4cd49fe936..09ea11b196 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -6,4 +6,4 @@ openstackdocstheme>=1.18.1 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0
 sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
 reno>=2.5.0 # Apache-2.0
-sphinxcontrib-httpdomain>=1.3.0  # BSD
+sphinxcontrib-httpdomain>=1.3.0 # BSD
diff --git a/requirements.txt b/requirements.txt
index c0109cdb69..75a21e967a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 Babel!=2.4.0,>=2.3.4 # BSD
 croniter>=0.3.4 # MIT License
-cryptography!=2.0,>=1.9 # BSD/Apache-2.0
+cryptography>=2.1 # BSD/Apache-2.0
 eventlet!=0.18.3,!=0.20.1,<0.21.0,>=0.18.2 # MIT
 keystoneauth1>=3.4.0 # Apache-2.0
 keystonemiddleware>=4.17.0 # Apache-2.0
@@ -30,7 +30,7 @@ osprofiler>=1.4.0 # Apache-2.0
 oslo.versionedobjects>=1.31.2 # Apache-2.0
 PasteDeploy>=1.5.0 # MIT
 aodhclient>=0.9.0 # Apache-2.0
-python-barbicanclient!=4.5.0,!=4.5.1,>=4.0.0 # Apache-2.0
+python-barbicanclient>=4.5.2 # Apache-2.0
 python-ceilometerclient>=2.5.0 # Apache-2.0
 python-cinderclient>=3.3.0 # Apache-2.0
 python-designateclient>=2.7.0 # Apache-2.0