diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9fc7fd8..35ff27a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,7 +10,7 @@ py37-django22:
         apt-get update &&
         apt-get install --no-install-recommends -t buster-backports -y
         python3-django python3-django-casclient python3-django-reversion python3-djangorestframework
-        python3-pil python3-tz python3-six python3-sqlparse python3-stdnum python3-yaml python3-coreapi
+        python3-pil python3-tz python3-six python3-sqlparse python3-stdnum python3-yaml python3-coreapi tox
   script: tox -e py37
 
 py38-django22:
@@ -23,7 +23,7 @@ py38-django22:
         apt-get update &&
         apt-get install --no-install-recommends -y
         python3-django python3-django-casclient python3-django-reversion python3-djangorestframework
-        python3-pil python3-tz python3-six python3-sqlparse python3-stdnum python3-yaml python3-coreapi
+        python3-pil python3-tz python3-six python3-sqlparse python3-stdnum python3-yaml python3-coreapi tox
   script: tox -e py37
 
 linters: