diff --git a/.gitlab-ci/Dockerfile b/.gitlab-ci/Dockerfile
index e428ff28431a7894d2a28ac5363f45ee9ae1df93..493b2416f8fb1b0c23578f3fc868f33445aa4727 100644
--- a/.gitlab-ci/Dockerfile
+++ b/.gitlab-ci/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:buster
+FROM debian:bullseye
 
 ENV LANG C.UTF-8
 ENV DEBIAN_FRONTEND noninteractive