diff --git a/requirements-dev.txt b/requirements-dev.txt
index 3b71e06..0336d61 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,7 +1,7 @@
-coverage==3.7.1
-flake8==2.2.5
-mccabe==0.2.1
-pep8==1.5.7
-pyflakes==0.8.1
+coverage
+flake8
+mccabe
+pep8
+pyflakes
 
 -e .