diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4b113427907f852c9e4b7c7813eb528e97cbbf43..d559b9585f52e10bcb9cb8c28048f75fb9466974 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,6 +1,6 @@
-sphinx==1.6.*
-sphinx_rtd_theme==0.*
-mock==2.*
-coverage==4.*
-pytest==3.*
-pytest-cov==2.*
+sphinx
+sphinx_rtd_theme
+mock
+coverage
+pytest
+pytest-cov