diff --git a/requirements.txt b/requirements.txt
index d33d2cc..4a907d6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-pbr>=2.0.0 # Apache-2.0
-Babel>=2.3.4 # BSD
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
+Babel!=2.4.0,>=2.3.4 # BSD
 
 Paste # MIT
 PasteDeploy>=1.5.0 # MIT
@@ -18,17 +18,17 @@ Jinja2!=2.9.0,!=2.9.1,!=2.9.2,!=2.9.3,!=2.9.4,>=2.8 # BSD License (3 clause)
 keystonemiddleware>=4.12.0 # Apache-2.0
 netaddr!=0.7.16,>=0.7.13 # BSD
 retrying!=1.3.0,>=1.2.3 # Apache-2.0
-SQLAlchemy>=1.0.10 # MIT
-WebOb>=1.6.0 # MIT
+SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT
+WebOb>=1.7.1 # MIT
 alembic>=0.8.10 # MIT
 six>=1.9.0 # MIT
 stevedore>=1.20.0 # Apache-2.0
 oslo.concurrency>=3.8.0 # Apache-2.0
 oslo.config>=3.22.0 # Apache-2.0
 oslo.context>=2.12.0 # Apache-2.0
-oslo.db>=4.15.0 # Apache-2.0
+oslo.db>=4.19.0 # Apache-2.0
 oslo.i18n>=2.1.0 # Apache-2.0
-oslo.log>=3.11.0 # Apache-2.0
+oslo.log>=3.22.0 # Apache-2.0
 oslo.messaging>=5.19.0 # Apache-2.0
 oslo.middleware>=3.10.0 # Apache-2.0
 oslo.policy>=1.17.0 # Apache-2.0