diff --git a/debian/gitlab-ci.yml b/debian/gitlab-ci.yml
index 8d0fd11f594d0b40e1f85148cfa191b8e5e1f029..a6f8a4e7e37931af3e45d8ac3472a3ab9de28f8e 100644
--- a/debian/gitlab-ci.yml
+++ b/debian/gitlab-ci.yml
@@ -167,7 +167,7 @@ package:sniper:
 
 build:devel:
     stage: build
-    image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/debian:testing-slim
+    image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/debian:bookworm-slim
     before_script:
         - *common_before_script
         - |
@@ -204,7 +204,7 @@ build:devel:
 
 build:clang:
     stage: build
-    image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/debian:testing-slim
+    image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/debian:bookworm-slim
     before_script:
         - *common_before_script
         - ./ci/prepare-deb.sh $BUILD_DEPENDENCIES clang clang-tools libclang-rt-dev