diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4f041867..2ba35d31 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,21 +7,6 @@ stages:
 variables:
   GIT_SUBMODULE_STRATEGY: recursive
 
-# Debian Bullseye
-py39-django42:
-  stage: test
-  image: debian:bullseye
-  before_script:
-    - >
-        apt-get update &&
-        apt-get install --no-install-recommends -y
-        python3-django python3-django-crispy-forms
-        python3-django-extensions python3-django-filters python3-django-polymorphic
-        python3-djangorestframework python3-django-oauth-toolkit python3-psycopg2 python3-pil
-        python3-babel python3-lockfile python3-pip python3-phonenumbers python3-memcache
-        python3-bs4 python3-setuptools tox texlive-xetex
-  script: tox -e py39-django42
-
 # Ubuntu 22.04
 py310-django42:
   stage: test
@@ -54,8 +39,6 @@ py311-django42:
         python3-bs4 python3-setuptools tox texlive-xetex
   script: tox -e py311-django42
 
-
-
 linters:
   stage: quality-assurance
   image: debian:bookworm
diff --git a/tox.ini b/tox.ini
index 31d827a0..924ea514 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,14 +1,14 @@
 [tox]
 envlist =
-    # Debian Bullseye Python
-    py39-django42
-
     # Ubuntu 22.04 Python
     py310-django42
 
     # Debian Bookworm Python
     py311-django42
 
+    # Ubuntu 24.04 Python
+    py312-django42
+
     linters
 skipsdist = True