diff --git a/requirements.txt b/requirements.txt
index 6aa9af6..9488982 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-mock==1.0.1
-nose==1.2.1
-flake8==1.7.0
+mock>=1.0.1
+nose>=1.2.1
+flake8>=1.7.0