diff --git a/tests/conftest.py b/tests/conftest.py
index 0fd79ea..e57d3e1 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,6 +1,8 @@
 import asyncio
 
 import pytest
+import pytest_asyncio
+
 from unwind import db
 
 
@@ -13,7 +15,7 @@ def event_loop():
     loop.close()
 
 
-@pytest.fixture(scope="session")
+@pytest_asyncio.fixture(scope="session")
 async def shared_conn():
     c = db.shared_connection()
     await c.connect()
@@ -24,7 +26,7 @@ async def shared_conn():
     await c.disconnect()
 
 
-@pytest.fixture
+@pytest_asyncio.fixture
 async def conn(shared_conn):
     async with shared_conn.transaction(force_rollback=True):
         yield shared_conn
diff --git a/tests/test_db.py b/tests/test_db.py
index caeaf69..13a7de4 100644
--- a/tests/test_db.py
+++ b/tests/test_db.py
@@ -3,10 +3,9 @@ import pytest
 
 from unwind import db, models, web_models
 
-pytestmark = pytest.mark.asyncio
 
-
-async def test_add_and_get(shared_conn):
+@pytest.mark.asyncio
+async def test_add_and_get(shared_conn: db.Database):
     async with shared_conn.transaction(force_rollback=True):
 
         m1 = models.Movie(
@@ -31,7 +30,8 @@ async def test_add_and_get(shared_conn):
         assert m2 == await db.get(models.Movie, id=str(m2.id))
 
 
-async def test_find_ratings(shared_conn):
+@pytest.mark.asyncio
+async def test_find_ratings(shared_conn: db.Database):
     async with shared_conn.transaction(force_rollback=True):
 
         m1 = models.Movie(
diff --git a/tests/test_imdb.py b/tests/test_imdb.py
index 13a03fd..48308a7 100644
--- a/tests/test_imdb.py
+++ b/tests/test_imdb.py
@@ -3,12 +3,12 @@ from unwind.imdb import imdb_rating_from_score, score_from_imdb_rating
 
 
 @pytest.mark.parametrize("rating", (x / 10 for x in range(10, 101)))
-def test_rating_conversion(rating):
+def test_rating_conversion(rating: float):
     assert rating == imdb_rating_from_score(score_from_imdb_rating(rating))
 
 
 @pytest.mark.parametrize("score", range(0, 101))
-def test_score_conversion(score):
+def test_score_conversion(score: int):
     # Because our score covers 101 discrete values and IMDb's rating only 91
     # discrete values, the mapping is non-injective, i.e. 10 values can't be
     # mapped uniquely.
diff --git a/tests/test_web.py b/tests/test_web.py
index 55c2d23..250447d 100644
--- a/tests/test_web.py
+++ b/tests/test_web.py
@@ -4,13 +4,11 @@ import pytest
 from unwind import create_app
 from unwind import db, models, imdb
 
-# https://pypi.org/project/pytest-asyncio/
-pytestmark = pytest.mark.asyncio
-
 app = create_app()
 
 
-async def test_app(shared_conn):
+@pytest.mark.asyncio
+async def test_app(shared_conn: db.Database):
     async with shared_conn.transaction(force_rollback=True):
 
         # https://www.starlette.io/testclient/