diff --git a/CHANGELOG.md b/CHANGELOG.md
index 63865fbc..f13d267f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,10 @@ any parts of the framework not mentioned in the documentation should generally b
   This adds full support for using multipart field names for includes while configuring `JSON_API_FORMAT_FIELD_NAMES`.
 * Ensured that sparse fieldset fully supports `JSON_API_FORMAT_FIELD_NAMES`.
 
+### Changed
+
+* Set minimum required version of optional Polymorphic Models for Django to 4.0.0.
+
 ### Removed
 
 * Removed support for Python 3.8.
diff --git a/requirements/requirements-optionals.txt b/requirements/requirements-optionals.txt
index 3db600e2..279fd95c 100644
--- a/requirements/requirements-optionals.txt
+++ b/requirements/requirements-optionals.txt
@@ -2,4 +2,4 @@ django-filter==24.3
 # once next version has been released (>3.1.0) this
 # should be set to pinned version again
 # see https://github.com/django-polymorphic/django-polymorphic/pull/541
-django-polymorphic@git+https://github.com/django-polymorphic/django-polymorphic@master  # pyup: ignore
+django-polymorphic@git+https://github.com/django-polymorphic/django-polymorphic@master  # pyup: ignore
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 0b88f4c9..2a2a28dd 100755
--- a/setup.py
+++ b/setup.py
@@ -110,7 +110,7 @@ def get_package_data(package):
         "django>=4.2",
     ],
     extras_require={
-        "django-polymorphic": ["django-polymorphic>=3.0"],
+        "django-polymorphic": ["django-polymorphic>=4.0.0"],
         "django-filter": ["django-filter>=2.4"],
     },
     setup_requires=wheel,