diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a7e7bb5..700a1fa 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,8 +9,8 @@ py39-django22:
     - >
         apt-get update &&
         apt-get install --no-install-recommends -y
-        python3-django python3-django-reversion python3-djangorestframework
-        python3-docutils python3-requests tox
+        python3-django python3-django-polymorphic python3-django-reversion
+        python3-djangorestframework python3-docutils python3-requests tox
   script: tox -e py39
 
 linters:
diff --git a/med/settings.py b/med/settings.py
index 69904ef..be9456a 100644
--- a/med/settings.py
+++ b/med/settings.py
@@ -36,6 +36,7 @@ INSTALLED_APPS = [
     'reversion',
     'rest_framework',
     'django_extensions',
+    'polymorphic',
 
     # Django contrib
     'django.contrib.admin',
diff --git a/requirements.txt b/requirements.txt
index 3c3b10a..7f2237e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 docutils~=0.16  # for Django-admin docs
 Django~=2.2
 django-filter~=2.4
+django-polymorphic~=3.0
 django-reversion~=3.0
 djangorestframework~=3.12
 django_extensions~=3.0