diff --git a/tests/p2p/test_sync_v2.py b/tests/p2p/test_sync_v2.py
index 0a9ef50bc..f25086215 100644
--- a/tests/p2p/test_sync_v2.py
+++ b/tests/p2p/test_sync_v2.py
@@ -15,6 +15,8 @@
 class BaseRandomSimulatorTestCase(SimulatorTestCase):
     __test__ = True
 
+    seed_config = 2
+
     def _get_partial_blocks(self, tx_storage):
         with tx_storage.allow_partially_validated_context():
             partial_blocks = set()
diff --git a/tests/simulation/test_simulator.py b/tests/simulation/test_simulator.py
index 3947a57f9..6e9f090d8 100644
--- a/tests/simulation/test_simulator.py
+++ b/tests/simulation/test_simulator.py
@@ -156,11 +156,15 @@ class SyncV1RandomSimulatorTestCase(unittest.SyncV1Params, BaseRandomSimulatorTe
 class SyncV2RandomSimulatorTestCase(unittest.SyncV2Params, BaseRandomSimulatorTestCase):
     __test__ = True
 
+    seed_config = 3
+
 
 # sync-bridge should behave like sync-v2
 class SyncBridgeRandomSimulatorTestCase(unittest.SyncBridgeParams, SyncV2RandomSimulatorTestCase):
     __test__ = True
 
+    seed_config = 4
+
     def test_compare_mempool_implementations(self):
         manager1 = self.create_peer()
         manager2 = self.create_peer()