diff --git a/test-requirements.txt b/test-requirements.txt
index 95d8f3d..c46ca66 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,6 +3,10 @@
 # process, which may cause wedges in the gate later.
 
 hacking>=1.1.0,<1.2.0 # 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
 
 # docs
 sphinx>=2.0.0,!=2.1.0 # BSD