diff --git a/.travis.yml b/.travis.yml
index ba0fa6c9..14d5fb2c 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: python
-install: make && pip install tox
+install: pip install virtualenv==20.0.21 && make && pip install tox
 script:
 - make ci
 cache: pip