diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a2decd792acfad9c19a54bac15a22d62163515ef..64a3fecd122c9a791519086241ca5711d0909dc1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,6 +9,6 @@ dune:git  gcc-8  C++17:
   image: registry.dune-project.org/docker/ci/dune:git-debian-10-gcc-8-17
   script: duneci-standard-test
 
-dune:git  gcc-6  C++14:
-  image: registry.dune-project.org/docker/ci/dune:git-debian-9-gcc-6-14
+dune:git  gcc-9  C++20:
+  image: registry.dune-project.org/docker/ci/dune:git-debian-11-gcc-9-20
   script: duneci-standard-test