diff --git a/.github/workflows/test-examples-proj1.yml b/.github/workflows/test-examples-proj1.yml
index 49a1e98..94b603e 100644
--- a/.github/workflows/test-examples-proj1.yml
+++ b/.github/workflows/test-examples-proj1.yml
@@ -11,7 +11,7 @@ jobs:
       max-parallel: 5
       matrix:
         python-version: ['3.10']
-        django-version: ['3.2', '4.0', '4.2']
+        django-version: ['3.2', '4.0', '4.2', '5.0']
         include:
           - django-version: 'main'
             python-version: '3.10'
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index df4e62a..4359119 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,12 +11,20 @@ jobs:
       max-parallel: 5
       matrix:
         python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
-        django-version: ['3.2', '4.0', '4.2']
-        include:
-          - django-version: 'main'
+        django-version: ['3.2', '4.0', '4.2', '5.0']
+        exclude:
+          - python-version: '3.11'
+            django-version: '3.2'
+          - python-version: '3.12'
+            django-version: '3.2'
+          - django-version: '5.0'
+            python-version: '3.8'
+          - django-version: '5.0'
             python-version: '3.9'
           - django-version: 'main'
-            python-version: '3.10'
+            python-version: '3.8'
+          - django-version: 'main'
+            python-version: '3.9'
 
     services:
       postgres:
diff --git a/django_redshift_backend/base.py b/django_redshift_backend/base.py
index b0f02a5..cece00a 100644
--- a/django_redshift_backend/base.py
+++ b/django_redshift_backend/base.py
@@ -16,6 +16,7 @@
 from django.conf import settings
 from django.core.exceptions import FieldDoesNotExist
 from django.db.models import Index
+from django.db.models.expressions import Col
 from django.db.utils import NotSupportedError, ProgrammingError
 
 from ._vendor.django40.db.backends.base.introspection import FieldInfo, TableInfo
@@ -58,6 +59,8 @@ class DatabaseFeatures(BasePGDatabaseFeatures):
     allows_group_by_select_index = True  # since django-4.2
     # since django-4.2. I don't know the Redshift supports comments or not.
     supports_comments = False
+    # since django-5.0. I don't know the Redshift supports default expression
+    supports_default_keyword_in_insert = False  # TODO: research
 
     # If support atomic for ddl, we should implement non-atomic migration for on rename and change type(size)
     # refs django-redshift-backend #96
@@ -146,6 +149,20 @@ def on_conflict_suffix_sql(
         ):
             return ""
 
+    # copy from djang 5.0 postgresql/operations.py
+    def prepare_join_on_clause(self, lhs_table, lhs_field, rhs_table, rhs_field):
+        lhs_expr = Col(lhs_table, lhs_field)
+        rhs_expr = Col(rhs_table, rhs_field)
+
+        # Cast is not impremented for redshift.
+        # Because the following code generate redundant SQL like:
+        # ... LEFT OUTER JOIN "tbl2" ON ("tbl1"."id" = CAST("tbl2"."parent_id" AS integer))
+
+        # if lhs_field.db_type(self.connection) != rhs_field.db_type(self.connection):
+        #     rhs_expr = Cast(rhs_expr, lhs_field)
+
+        return lhs_expr, rhs_expr
+
 
 def _get_type_default(field):
     internal_type = field.get_internal_type()
diff --git a/doc/index.rst b/doc/index.rst
index 181d9e1..4323f91 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -44,7 +44,7 @@ Support versions
 This product is tested with:
 
 * Python-3.8, 3.9, 3.10, 3.11, 3.12
-* Django-3.2, 4.0, 4.2
+* Django-3.2, 4.0, 4.2, 5.0
 
 License
 =======
diff --git a/pyproject.toml b/pyproject.toml
index 396259d..10b1b99 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ classifiers = [
     "Framework :: Django :: 3.2",
     "Framework :: Django :: 4.0",
     "Framework :: Django :: 4.2",
+    "Framework :: Django :: 5.0",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python",
diff --git a/tox.ini b/tox.ini
index 95be6e0..059842e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,9 @@
 [tox]
 envlist =
-    py{38,39,310,311,312}-dj{32,40,42,main}
+    py{38,39,310}-dj32
+    py{38,39,310,311,312}-dj40
+    py{38,39,310,311,312}-dj42
+    py{310,311,312}-dj50
     lint
     check
 skipsdist = True
@@ -18,6 +21,7 @@ DJANGO =
     3.2: dj32
     4.0: dj40
     4.2: dj42
+    5.0: dj50
     main: djmain
 
 [testenv]
@@ -32,6 +36,7 @@ deps =
     dj32: Django>=3.2,<3.3
     dj40: Django>=4.0,<4.1
     dj42: Django>=4.2,<5.0
+    dj50: Django>=5.0,<5.1
     djmain: https://github.com/django/django/archive/main.tar.gz
 setenv =
     DJANGO_SETTINGS_MODULE = settings