diff --git a/.travis.yml b/.travis.yml
index 53b22ea65..4c832e296 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: python
 
 before_script:
-- pip install tox
+- pip install 'tox<2.4.0,>=2.0'
 
 script: tox