diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 91a118ce..936f47e9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -21,7 +21,7 @@ unittests:
   - poetry run ./manage.py compilemessages
   # Run tests and export report
   - poetry run coverage run ./manage.py test
-  - poetry run coverage html
+  - poetry run coverage xml
   - poetry run coverage report
   # Build documentation
   - cd doc
@@ -32,9 +32,13 @@ unittests:
     paths:
       - .cache/pip_tests
   artifacts:
+    when: always
     paths:
+      - coverage.xml
       - coverage_report/
       - docs/_build
+    reports:
+      junit: coverage.xml
 
 # Check black
 black:
diff --git a/pyproject.toml b/pyproject.toml
index bffcffa0..fe92876b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ homepage = "https://ae.utbm.fr/"
 license = "GPL-3.0-only"
 
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.8"
 Django = "^2.2"
 Pillow = "^8.3.2"
 mistune = "^0.8.4"
@@ -41,7 +41,7 @@ django-simple-captcha = "^0.5.14"
 python-dateutil = "^2.8.2"
 psycopg2-binary = "2.8.6"
 sentry-sdk = "^1.4.3"
-graphviz = "^0.17"
+pygraphviz = "^1.9"
 Jinja2 = "<=3.0.3"
 
 # Extra optional dependencies