diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9cb177101a52ae82d4c1d06142c430e68bd935a8..b1c67fce2245c0213036666861a7c513e4fc0731 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -75,6 +75,7 @@ install_and_test_311:
   image: python:3.11
   stage: test
   script:
+    - pip3 install cython
     - pip3 install -e . --no-deps
     - python3 -m pytest
   artifacts: