diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 627051b..6f528b2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -142,6 +142,7 @@ test:
           - .DEBIAN/requirements-ubuntu-23.04.txt
   before_script:
     - apt-get update && apt-get install -y python3-dev gcc
+    - pip install cython
     - pip install -r $REQUIREMENTS
     - pip install pytest httpx
     - mkdir -p app/cert