diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index da8c516..13c1ad6 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v3
diff --git a/setup.py b/setup.py
index f870b91..b542c5e 100755
--- a/setup.py
+++ b/setup.py
@@ -21,6 +21,7 @@ def read(f):
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Operating System :: POSIX",
     "Environment :: Web Environment",
     "Development Status :: 3 - Alpha",
diff --git a/tests/conftest.py b/tests/conftest.py
index 431b732..309eb25 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -85,15 +85,15 @@ def dsn(tmp_path, request, db):
         mysql_params = request.getfixturevalue("mysql_params")
         conf = create_mysql_dsn(mysql_params)
     else:
-        conf = os.environ.get(
-            "DSN", f'Driver=SQLite3;Database={tmp_path / "sqlite.db"}'
-        )
+        p = tmp_path / "sqlite.db"
+        conf = os.environ.get("DSN", "Driver=SQLite3;Database={}".format(p))
 
     return conf
 
 
 @pytest_asyncio.fixture
 async def conn(dsn, connection_maker):
+    assert dsn
     connection = await connection_maker()
     yield connection