diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8b78ea52f3c43598e0ed8ced373634d0e3ae0cf7..6ab2fd5e1ad1b1d7b882920d4bd58a3b580cad9d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -40,6 +40,7 @@ build-openapi-scheme:
 
 run_test_cases:
   stage: test
+  image: python:3.11-slim
   before_script:
     - *install_requirements
   script: