diff --git a/.github/workflows/ce-dev-build-dev.yml b/.github/workflows/ce-dev-build-dev.yml
index 7f592bf..7db7823 100644
--- a/.github/workflows/ce-dev-build-dev.yml
+++ b/.github/workflows/ce-dev-build-dev.yml
@@ -39,5 +39,5 @@ jobs:
       - name: Build and push Docker images
         run: |
           echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
-          /bin/sh docker-images/export.sh --version devel --image-name ce-dev --base-image debian:bookworm-slim --dockerfile-path base-devel --push
-          /bin/sh docker-images/export.sh --version devel --image-name ce-dev-controller --base-image debian:bookworm-slim --dockerfile-path controller-devel --push
+          /bin/sh docker-images/export.sh --version devel --image-name ce-dev --base-image debian:bullseye-slim --dockerfile-path base-devel --push
+          /bin/sh docker-images/export.sh --version devel --image-name ce-dev-controller --base-image debian:bullseye-slim --dockerfile-path controller-devel --push
diff --git a/docker-images/base-devel/Dockerfile b/docker-images/base-devel/Dockerfile
index 2c89636..92afe8a 100644
--- a/docker-images/base-devel/Dockerfile
+++ b/docker-images/base-devel/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:bookworm-slim as unison
+FROM debian:bullseye-slim as unison
 RUN \
   set -x && \
   export DEBIAN_FRONTEND=noninteractive && \
@@ -14,7 +14,7 @@ RUN \
   cd /tmp/unison-2.53.3 && \
   make
 
-FROM debian:bookworm-slim
+FROM debian:bullseye-slim
 
 RUN \
   set -x && \
@@ -100,4 +100,4 @@ ENV container docker
 STOPSIGNAL SIGRTMIN+3
 VOLUME [ "/sys/fs/cgroup", "/run", "/run/lock", "/tmp" ]
 
-ENTRYPOINT ["/sbin/init"]
\ No newline at end of file
+ENTRYPOINT ["/sbin/init"]