diff --git a/Dockerfile.ci-debian b/Dockerfile.ci-debian
index 6d7f9449..23494315 100644
--- a/Dockerfile.ci-debian
+++ b/Dockerfile.ci-debian
@@ -3,7 +3,7 @@ ARG EXTRA_PACKAGES
 
 COPY debian/control /tuxpkg/debian/control
 
-RUN echo 'deb http://deb.debian.org/debian bullseye-backports main'>> /etc/apt/sources.list \
+RUN echo 'deb http://deb.debian.org/debian bookworm-backports main'>> /etc/apt/sources.list \
     && apt-get update \
     && apt-get install -qy auto-apt-proxy \
     && apt-get build-dep -qy /tuxpkg \
@@ -11,7 +11,7 @@ RUN echo 'deb http://deb.debian.org/debian bullseye-backports main'>> /etc/apt/s
         black \
         codespell \
         flake8 \
-        flit/bullseye-backports \
+        flit/bookworm-backports \
         git \
         make \
         mkdocs \