My first guess is you have a typo in your reformatting! https://gitlab.freedesktop.org/freetype/docker-images/-/commit/6efc314210a1f53495b8be6ea824de5ca702216c
You should only need to change one line - the first: FROM debian:buster-20210511-slim to FROM debian:bookworm-20250428-slim (and make sure debian:bookworm-20250428-slim is valid?) I'd try backing out everything else - the cosmetic / reformatting at the bottom. The docker scripts are mostly shell script syntax - you might have an invisible white space after "\". Anyway, separating functionality change from cosmetic / reformatting changes is a good idea. On Tuesday 29 April 2025 at 09:40:09 BST, Werner LEMBERG <w...@gnu.org> wrote: Folks, I've updated https://gitlab.freedesktop.org/freetype/docker-images/-/blob/master/Dockerfile?ref_type=heads to use Debian Bookworm – we need a more recent HarfBuzz library for tests. However, the pipeline to create the Docker image fails, see https://gitlab.freedesktop.org/freetype/docker-images/-/jobs/75403707 What am I missing? I'm a complete noob regarding CI — and Docker. Please advise. Werner