diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..5743aa3
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+
+concurrency:
+  group: ${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    name: Python ${{ matrix.python-version }}
+    runs-on: ubuntu-22.04
+
+    strategy:
+      matrix:
+        python-version:
+        - '3.8'
+        - '3.9'
+        - '3.10'
+        - '3.11'
+        - '3.12'
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools wheel
+        python -m pip install --upgrade 'tox>=4.0.0rc3'
+
+    - name: Run tox targets for ${{ matrix.python-version }}
+      run: tox run -f py$(echo ${{ matrix.python-version }} | tr -d .)
diff --git a/django_mailbox/tests/test_process_email.py b/django_mailbox/tests/test_process_email.py
index 874da0a..c1179bf 100644
--- a/django_mailbox/tests/test_process_email.py
+++ b/django_mailbox/tests/test_process_email.py
@@ -385,7 +385,7 @@ class TestProcessEmail(EmailMessageTestCase):
 
             msg = self.mailbox.process_incoming_message(message)
 
-        assert msg.eml
+        self.assertNotEqual(msg.eml, None)
 
         self.assertTrue(msg.eml.name.endswith('.eml'))
 
@@ -407,7 +407,7 @@ class TestProcessEmail(EmailMessageTestCase):
 
             msg = self.mailbox.process_incoming_message(message)
 
-        assert not msg.eml
+        self.assertEqual(msg.eml, None)
 
     def test_message_compressed(self):
         message = self._get_email_object('generic_message.eml')
@@ -422,7 +422,7 @@ class TestProcessEmail(EmailMessageTestCase):
 
             msg = self.mailbox.process_incoming_message(message)
 
-        # actual_email_object = msg.get_email_object()
+        actual_email_object = msg.get_email_object()
 
         self.assertTrue(msg.eml.name.endswith('.eml.gz'))
 
diff --git a/tox.ini b/tox.ini
index 24c9627..a04703e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,7 +23,7 @@ passenv=
     EMAIL_PASSWORD
     EMAIL_SMTP_SERVER
 deps=
-    django50: Django>=5.0rc1,<5.1
+    django50: Django==5.0rc1,<5.1
     django42: Django>=4.2,<5.0
     django41: Django>=4.1,<4.2
     django40: Django>=4.0,<4.1