diff --git a/requirements.txt b/requirements.txt
index d3ba029b367..aa77cd52424 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 # 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
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
 Paste # MIT
 PasteDeploy>=1.5.0 # MIT
@@ -15,11 +15,11 @@ 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
 netifaces>=0.10.4 # MIT
-neutron-lib>=1.3.0 # Apache-2.0
+neutron-lib>=1.4.0 # Apache-2.0
 python-neutronclient>=5.1.0 # Apache-2.0
 tenacity>=3.2.1 # Apache-2.0
 ryu>=4.9 # Apache-2.0
-SQLAlchemy>=1.0.10 # MIT
+SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT
 WebOb>=1.7.1 # MIT
 keystoneauth1>=2.18.0 # Apache-2.0
 alembic>=0.8.10 # MIT