diff --git a/test-requirements.txt b/test-requirements.txt
index afcc72f..d5b8079 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,6 +3,11 @@
 # 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>=3.6
 python-subunit>=0.0.18
 oslotest>=1.10.0 # Apache-2.0