diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c1fa639af12b9937e78a06c0294bec6f06b7717e..b9c34c3ef7875c6569a29e37735e5fe05c4d8e6e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: python:latest
+image: python:3.9
 
 variables:
   PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"