diff --git a/app/settings.py b/app/settings.py
index 08076b7..50d31a9 100644
--- a/app/settings.py
+++ b/app/settings.py
@@ -56,8 +56,7 @@ def db_dsn_parsed(self) -> URL:
 
     @property
     def sync_db_dsn_parsed(self) -> URL:
-        # Alembic drives psycopg2, not asyncpg.
-        return self.db_dsn_parsed.set(drivername="postgresql")
+        return self.db_dsn_parsed.set(drivername="postgresql+psycopg2")
 
     @property
     def api_bootstrapper_config(self) -> LitestarConfig:
diff --git a/pyproject.toml b/pyproject.toml
index ee84d52..129fca2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,8 @@ dependencies = [
     "alembic",
     "alembic-postgresql-enum",
     "psycopg2",
-    "sqlalchemy[asyncio]",
+    # <2.1 until advanced-alchemy translates 2.1 integrity errors (litestar-org/advanced-alchemy#803).
+    "sqlalchemy[asyncio]<2.1",
     "asyncpg",
     # tracing
     "opentelemetry-instrumentation-asyncpg",
diff --git a/tests/test_settings.py b/tests/test_settings.py
index 0162f88..f4b8669 100644
--- a/tests/test_settings.py
+++ b/tests/test_settings.py
@@ -9,9 +9,9 @@ def test_db_dsn_parsed_exposes_driver() -> None:
     assert settings.db_dsn_parsed.database == "dbname"
 
 
-def test_sync_db_dsn_parsed_drops_the_async_driver() -> None:
+def test_sync_db_dsn_parsed_names_the_sync_driver() -> None:
     settings = Settings(db_dsn="postgresql+asyncpg://user:pw@host/dbname")
-    assert settings.sync_db_dsn_parsed.drivername == "postgresql"
+    assert settings.sync_db_dsn_parsed.drivername == "postgresql+psycopg2"
     assert settings.sync_db_dsn_parsed.database == "dbname"