diff --git a/requirements_dev.txt b/requirements_dev.txt
index 2e3a124..65015a2 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,5 +4,4 @@ twine==1.13.0
 pytest==4.3.0
 pytest-cov==2.6.1
 coveralls==1.6.0
-setuptools
-tox
\ No newline at end of file
+setuptools==40.8.0
\ No newline at end of file