diff --git a/src/govoplan_core/core/policy.py b/src/govoplan_core/core/policy.py
index 798c4b0..d23e97b 100644
--- a/src/govoplan_core/core/policy.py
+++ b/src/govoplan_core/core/policy.py
@@ -173,6 +173,7 @@ class DefinitionGovernanceRequest:
 class DefinitionGovernancePolicy(Protocol):
     def resolve_definition_action(
         self,
+        session: object | None = None,
         *,
         request: DefinitionGovernanceRequest,
     ) -> PolicyDecision: