diff --git a/lower-constraints.txt b/lower-constraints.txt
index c328932d..794ccca8 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -15,9 +15,7 @@ dulwich==0.15.0
 extras==1.0.0
 fasteners==0.7.0
 fixtures==3.0.0
-flake8==2.5.5
 future==0.16.0
-hacking==0.12.0
 idna==2.6
 imagesize==0.7.1
 iso8601==0.1.11
@@ -26,10 +24,9 @@ jmespath==0.9.0
 jsonpatch==1.16
 jsonpointer==1.13
 jsonschema==2.6.0
-keystoneauth1==3.4.0
+keystoneauth1==3.11.0
 linecache2==1.0.0
 MarkupSafe==1.0
-mccabe==0.2.1
 monotonic==0.6
 mox3==0.20.0
 msgpack-python==0.4.0
@@ -51,13 +48,10 @@ oslo.utils==3.33.0
 oslotest==3.2.0
 paramiko==2.0.0
 pbr==2.0.0
-pep8==1.5.7
 positional==1.2.1
 prettytable==0.7.2
 pyasn1==0.1.8
 pycparser==2.18
-pyflakes==0.8.1
-Pygments==2.2.0
 pyinotify==0.9.6
 pyOpenSSL==17.1.0
 pyparsing==2.1.0
@@ -72,8 +66,8 @@ python-novaclient==9.1.0
 python-openstackclient==3.12.0
 python-subunit==1.0.0
 python-swiftclient==3.2.0
-pytz==2013.6
-PyYAML==3.13
+pytz==2015.7
+PyYAML==5.3.1
 requests==2.14.2
 requests-mock==1.2.0
 requestsexceptions==1.2.0
diff --git a/requirements.txt b/requirements.txt
index 05ace59d..2b55c0e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,13 +3,13 @@
 # process, which may cause wedges in the gate later.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-PrettyTable<0.8,>=0.7.2 # BSD
-keystoneauth1>=3.4.0 # Apache-2.0
+PrettyTable>=0.7.2 # BSD
+keystoneauth1>=3.11.0 # Apache-2.0
 openstacksdk>=0.24.0 # Apache-2.0
 osc-lib>=1.11.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 python-heatclient>=1.10.0 # Apache-2.0
-PyYAML>=3.13 # MIT
+PyYAML>=5.3.1 # MIT
 requests>=2.14.2 # Apache-2.0