diff --git a/test-requirements.txt b/test-requirements.txt
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1,5 @@
-mock==1.0.1
-pytest==2.9.1
-coverage==3.7.1
-pytest-cov==2.1.0
-flake8==3.4.1
+mock>=1.0.1
+pytest>=2.9.1
+coverage>=3.7.1
+pytest-cov>=2.1.0
+flake8>=3.4.1
-- 
2.9.0