diff --git a/nova/tests/unit/db/api/test_migrations.py b/nova/tests/unit/db/api/test_migrations.py
index f714cf1852de..5b25755c7694 100644
--- a/nova/tests/unit/db/api/test_migrations.py
+++ b/nova/tests/unit/db/api/test_migrations.py
@@ -41,6 +41,10 @@ LOG = logging.getLogger(__name__)
 class NovaModelsMigrationsSync(test_migrations.ModelsMigrationsSync):
     """Test that the models match the database after migrations are run."""
 
+    # Migrations can take a long time, particularly on underpowered CI nodes.
+    # Give them some breathing room.
+    TIMEOUT_SCALING_FACTOR = 4
+
     def setUp(self):
         super().setUp()
         self.engine = enginefacade.writer.get_engine()
@@ -185,6 +189,10 @@ class NovaMigrationsWalk(
     test_fixtures.OpportunisticDBTestMixin, test.NoDBTestCase,
 ):
 
+    # Migrations can take a long time, particularly on underpowered CI nodes.
+    # Give them some breathing room.
+    TIMEOUT_SCALING_FACTOR = 4
+
     def setUp(self):
         super().setUp()
         self.engine = enginefacade.writer.get_engine()
diff --git a/nova/tests/unit/db/main/test_migrations.py b/nova/tests/unit/db/main/test_migrations.py
index c0da4cc66ae5..627b3fdc75e5 100644
--- a/nova/tests/unit/db/main/test_migrations.py
+++ b/nova/tests/unit/db/main/test_migrations.py
@@ -49,6 +49,10 @@ LOG = logging.getLogger(__name__)
 class NovaModelsMigrationsSync(test_migrations.ModelsMigrationsSync):
     """Test sqlalchemy-migrate migrations."""
 
+    # Migrations can take a long time, particularly on underpowered CI nodes.
+    # Give them some breathing room.
+    TIMEOUT_SCALING_FACTOR = 4
+
     def setUp(self):
         # Ensure BaseTestCase's ConfigureLogging fixture is disabled since
         # we're using our own (StandardLogging).
@@ -197,6 +201,10 @@ class NovaMigrationsWalk(
     test_fixtures.OpportunisticDBTestMixin, test.NoDBTestCase,
 ):
 
+    # Migrations can take a long time, particularly on underpowered CI nodes.
+    # Give them some breathing room.
+    TIMEOUT_SCALING_FACTOR = 4
+
     def setUp(self):
         super().setUp()
         self.engine = enginefacade.writer.get_engine()