diff --git a/changelog.d/13159.misc b/changelog.d/13159.misc
new file mode 100644
index 000000000..bb5554ebe
--- /dev/null
+++ b/changelog.d/13159.misc
@@ -0,0 +1 @@
+Improve and fix type hints.
\ No newline at end of file
diff --git a/mypy.ini b/mypy.ini
index b9b16860d..d757a88fd 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -73,7 +73,6 @@ exclude = (?x)
    |tests/util/test_lrucache.py
    |tests/util/test_rwlock.py
    |tests/util/test_wheel_timer.py
-   |tests/utils.py
    )$
 
 [mypy-synapse.federation.transport.client]
diff --git a/tests/server.py b/tests/server.py
index b9f465971..ce017ca0f 100644
--- a/tests/server.py
+++ b/tests/server.py
@@ -830,7 +830,6 @@ def setup_test_homeserver(
 
     # Mock TLS
     hs.tls_server_context_factory = Mock()
-    hs.tls_client_options_factory = Mock()
 
     hs.setup()
     if homeserver_to_use == TestHomeServer:
diff --git a/tests/utils.py b/tests/utils.py
index cabb2c0de..aca6a0083 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -64,7 +64,7 @@ def setupdb():
             password=POSTGRES_PASSWORD,
             dbname=POSTGRES_DBNAME_FOR_INITIAL_CREATE,
         )
-        db_conn.autocommit = True
+        db_engine.attempt_to_set_autocommit(db_conn, autocommit=True)
         cur = db_conn.cursor()
         cur.execute("DROP DATABASE IF EXISTS %s;" % (POSTGRES_BASE_DB,))
         cur.execute(
@@ -94,7 +94,7 @@ def setupdb():
                 password=POSTGRES_PASSWORD,
                 dbname=POSTGRES_DBNAME_FOR_INITIAL_CREATE,
             )
-            db_conn.autocommit = True
+            db_engine.attempt_to_set_autocommit(db_conn, autocommit=True)
             cur = db_conn.cursor()
             cur.execute("DROP DATABASE IF EXISTS %s;" % (POSTGRES_BASE_DB,))
             cur.close()