diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 217d6ce015063fd7875f4f37544b815fa06f77ba..8fde40c0d1e1f463073f90881ee8386fbf74370f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: python:3.8-buster
+image: python:3.9-bullseye
 
 variables:
   GIT_SUBMODULE_STRATEGY: recursive