diff --git a/test-requirements.txt b/test-requirements.txt
index fe6146bf..212a0c9a 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,6 +2,10 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 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
 python-barbicanclient>=4.5.2 # Apache-2.0