diff --git a/test-requirements.txt b/test-requirements.txt
index c2d595b..b99db27 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,6 +3,10 @@
 # process, which may cause wedges in the gate later.
 
 hacking<0.13,>=0.12.0 # 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
 
 python-subunit>=1.0.0 # Apache-2.0/BSD
 oslotest>=3.2.0 # Apache-2.0