diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9c634d0..253015d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,62 +1,49 @@
-image: debian-stable
+image: python:3.9.16-slim-bullseye
 
 stages:
   - analyse
   - test
   - deploy
 
-variables:
-  GIT_SUBMODULE_STRATEGY: normal
-
 cache:
   paths:
     - .venv/
+    - /.cache/poetry
 
 .setup_build: &setup_build
   - apt-get update
   - apt-get dist-upgrade -y
   - >
     apt-get install --no-install-recommends -y
-    bash
-    build-essential
-    cmake
-    coreutils
-    findutils
+    curl
     git
-    grep
     make
     plantuml
     python3
-    python3-pip
-    python3-venv
+    python3-distutils
     rsync
-    sed
-  # Convenient hack until this is fixed.
   - ln -s /usr/bin/python3 /usr/bin/python
-  - python -m venv .venv
-  - . ./.venv/bin/activate
-  - python -m pip install -r requirements.txt
-  - mkdir build
-  - cd build
+  - curl -sSL https://install.python-poetry.org | python3 - --version 1.4.1
+  - export PATH="/root/.local/bin:$PATH"
 
-sphinx_html:
+doc:
   stage: test
   needs: []
   script:
     - *setup_build
-    - cmake -DDOC:STRING=html ..
+    - poetry install -n
     - make
   artifacts:
     paths:
-      - build/doc/html
+      - build/doc
 
 pages:
   stage: deploy
   rules:
     - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
-  needs: ["sphinx_html"]
+  needs: ["doc"]
   script:
-    - mv build/doc/html public
+    - mv build/doc public
   artifacts:
     paths:
       - public