diff --git a/lower-constraints.txt b/lower-constraints.txt
index f70638de..374c2137 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -1,7 +1,7 @@
 appdirs==1.3.0
 Babel==2.3.4
 bandit==1.4.0
-cassandra-driver==3.11.0
+cassandra-driver==3.21.0
 coverage==4.0
 debtcollector==1.2.0
 docutils==0.11
@@ -15,7 +15,7 @@ GitPython==1.0.1
 greenlet==0.4.10
 influxdb==2.9.2
 iso8601==0.1.11
-kazoo==2.2
+kazoo==2.8.0
 keystoneauth1==3.4.0
 linecache2==1.0.0
 mccabe==0.4.0
diff --git a/requirements.txt b/requirements.txt
index c61f1fbb..bbc6e546 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,5 @@ oslo.log>=3.36.0 # Apache-2.0
 
 six>=1.10.0 # MIT
 monasca-common>=2.16.0 # Apache-2.0
-cassandra-driver>=3.11.0
+cassandra-driver>=3.21.0
 simplejson>=3.8.1
diff --git a/setup.cfg b/setup.cfg
index 0dc22304..05c7ca70 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -38,7 +38,7 @@ data_files =
 influxdb =
   influxdb>=2.9.2 # MIT
 cassandra =
-  cassandra-driver>=3.11.0 # Apache-2.0
+  cassandra-driver>=3.21.0 # Apache-2.0
 elasticsearch =
   elasticsearch<3.0.0,>=2.0.0 # Apache-2.0
 
diff --git a/test-requirements.txt b/test-requirements.txt
index 237e3b16..9b058298 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,12 +4,16 @@
 bandit>=1.1.0 # Apache-2.0
 flake8<2.6.0,>=2.5.4 # MIT
 hacking>=3.0.1,<3.1.0 # Apache-2.0
+# remove this pyflakes from here once you bump the
+# hacking to 3.2.0 or above. hacking 3.2.0 takes
+# care of pyflakes version compatibilty.
+pyflakes>=2.1.1
 coverage!=4.4,>=4.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 stestr>=1.0.0 # Apache-2.0
 docutils>=0.11 # OSI-Approved Open Source, Public Domain
 pycodestyle>=2.5.0 # MIT
-cassandra-driver>=3.11.0
+cassandra-driver>=3.21.0
 
 # release notes
 sphinx>=2.0.0,!=2.1.0 # BSD