diff --git a/test-requirements.txt b/test-requirements.txt
index 735b4dd..baf6cad 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,6 @@
-hacking>=0.12.0,!=0.13.0,<0.14  # Apache-2.0
+pep8
+pyflakes
+flake8
 
 coverage>=3.6
 sphinx>=1.5.1,<1.6