diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bb3dd749e72ac2ac1de1572dedc6292a2e022b1f..455f0c7a6f6513e0e7f449a45a5ad3efcd5afe40 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,6 +7,10 @@ dune:git  clang  C++17:
   image: registry.dune-project.org/docker/ci/dune:git-debian-10-clang-7-libcpp-17
   script: duneci-standard-test
 
+dune:git  gcc-9  C++20:
+  image: registry.dune-project.org/docker/ci/dune:git-debian-11-gcc-9-20
+  script: duneci-standard-test
+
 dune:git  gcc-8  C++17:
   image: registry.dune-project.org/docker/ci/dune:git-debian-10-gcc-8-17
   script: duneci-standard-test