diff --git a/test-requirements.txt b/test-requirements.txt
index c8384a8..4c7bd99 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,2 +1,3 @@
 docutils
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
+pyflakes>=2.2.0