--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1,5 @@
-mock==1.0.1
-pytest==2.7.2
-coverage==3.7.1
-pytest-cov==2.1.0
-flake8==2.4.1
\ No newline at end of file
+mock>=1.0.1
+pytest>=2.7.2
+coverage>=3.7.1
+pytest-cov>=2.1.0
+flake8>=2.4.1