diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b4effa0..c69c6e7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,12 +9,6 @@ jobs:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
         django-version: ["3.2", "4.0", "4.1"]
         exclude:
-          # Python 3.6 is not compatible with 4.0
-          - python-version: "3.6"
-            django-version: "4.0"
-          # Python 3.6 is not compatible with 4.1
-          - python-version: "3.6"
-            django-version: "4.1"
           # Python 3.7 is not compatible with 4.0
           - python-version: "3.7"
             django-version: "4.0"
diff --git a/dj_database_url.py b/dj_database_url.py
index c9198e2..bfba749 100644
--- a/dj_database_url.py
+++ b/dj_database_url.py
@@ -102,7 +102,7 @@ def parse(url, engine=None, conn_max_age=0, ssl_require=False):
     port = (
         str(url.port)
         if url.port
-        and engine in [SCHEMES["oracle"], SCHEMES["mssql"], SCHEMES["mssqlms"]]
+        and engine in (SCHEMES["oracle"], SCHEMES["mssql"], SCHEMES["mssqlms"])
         else url.port
     )
 
diff --git a/setup.py b/setup.py
index 21bc2b7..05b9df5 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,8 @@
+from pathlib import Path
+
 from setuptools import setup
 
-with open("README.rst") as readme_rst:
-    readme = readme_rst.read()
+readme = Path("README.rst").read_text()
 
 setup(
     name="dj-database-url",