diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 01e25c1..b627b65 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,6 +10,7 @@ services:
 cache:
   paths:
     - .cache/pip
+    - .tox
 
 tests:
   before_script: