1 files changed, 1 insertions, 1 deletions
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index eb52552..e500b7a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,7 +17,7 @@ cache:
 
 before_script:
   - python --version  # For debugging
-  - pip install tox
+  - pip install 'tox<4'
 
 test:
   script: