diff --git a/src/access_control.py b/src/access_control.py
index 15625aa..f71cff2 100644
--- a/src/access_control.py
+++ b/src/access_control.py
@@ -160,6 +160,7 @@ def execute_decision(  # noqa: PLR0913
     approver: entities.slack.User,
     requester: entities.slack.User,
     reason: str,
+    thread_ts: str | None = None,
 ) -> bool:
     logger.info("Executing decision")
     if not decision.grant:
@@ -215,6 +216,7 @@ def execute_decision(  # noqa: PLR0913
             permission_set_arn=permission_set.arn,
             user_principal_id=sso_user_principal_id,
         ),
+        thread_ts=thread_ts,
     )
     return True  # Temporary solution for testing
 
@@ -227,6 +229,7 @@ def execute_decision_on_group_request(  # noqa: PLR0913
     requester: entities.slack.User,
     reason: str,
     identity_store_id: str,
+    thread_ts: str | None = None,
 ) -> bool:
     logger.info("Executing decision")
     if not decision.grant:
@@ -284,5 +287,6 @@ def execute_decision_on_group_request(  # noqa: PLR0913
             user_principal_id=sso_user_principal_id,
             membership_id=membership_id,
         ),
+        thread_ts=thread_ts,
     )
     return  # type: ignore # noqa: PGH003
diff --git a/src/events.py b/src/events.py
index 0daf5fd..55b1bec 100644
--- a/src/events.py
+++ b/src/events.py
@@ -14,6 +14,7 @@ class RevokeEvent(BaseModel):
     requester: entities.slack.User
     user_account_assignment: sso.UserAccountAssignment
     permission_duration: timedelta
+    thread_ts: str | None = None
 
 
 class GroupRevokeEvent(BaseModel):
@@ -22,6 +23,7 @@ class GroupRevokeEvent(BaseModel):
     requester: entities.slack.User
     group_assignment: sso.GroupAssignment
     permission_duration: timedelta
+    thread_ts: str | None = None
 
 
 class ScheduledGroupRevokeEvent(BaseModel):
diff --git a/src/group.py b/src/group.py
index ce28cd0..5c9d386 100644
--- a/src/group.py
+++ b/src/group.py
@@ -138,6 +138,7 @@ def handle_request_for_group_access_submittion(
         reason=request.reason,
         decision=decision,
         identity_store_id=identity_store_id,
+        thread_ts=slack_response["ts"],
     )
 
     if decision.grant:
@@ -247,6 +248,7 @@ def handle_group_button_click(body: dict, client: WebClient, context: BoltContex
         requester=requester,
         reason=payload.request.reason,
         identity_store_id=identity_store_id,
+        thread_ts=payload.thread_ts,
     )
     cache_for_dublicate_requests.clear()
     if cfg.send_dm_if_user_not_in_channel and not is_user_in_channel:
diff --git a/src/main.py b/src/main.py
index 3240c39..39ed8b8 100644
--- a/src/main.py
+++ b/src/main.py
@@ -289,6 +289,7 @@ def handle_button_click(body: dict, client: WebClient, context: BoltContext) ->
         approver=approver,
         requester=requester,
         reason=payload.request.reason,
+        thread_ts=payload.thread_ts,
     )
     cache_for_dublicate_requests.clear()
     if cfg.send_dm_if_user_not_in_channel and not is_user_in_channel:
@@ -448,6 +449,7 @@ def handle_request_for_access_submittion(  # noqa: PLR0915, PLR0912
         approver=requester,
         requester=requester,
         reason=request.reason,
+        thread_ts=slack_response["ts"],
     )
 
     if decision.grant:
diff --git a/src/revoker.py b/src/revoker.py
index 9846665..3dee375 100644
--- a/src/revoker.py
+++ b/src/revoker.py
@@ -182,6 +182,7 @@ def slack_notify_user_on_revoke(  # noqa: PLR0913
     sso_client: SSOAdminClient,
     identitystore_client: IdentityStoreClient,
     slack_client: slack_sdk.WebClient,
+    thread_ts: str | None = None,
 ) -> SlackResponse:
     mention = slack_helpers.create_slack_mention_by_principal_id(
         sso_user_id=(
@@ -197,6 +198,7 @@ def slack_notify_user_on_revoke(  # noqa: PLR0913
     return slack_client.chat_postMessage(
         channel=cfg.slack_channel_id,
         text=f"Revoked role {permission_set.name} for user {mention} in account {account.name}",
+        thread_ts=thread_ts,
     )
 
 
@@ -206,6 +208,7 @@ def slack_notify_user_on_group_access_revoke(  # noqa: PLR0913
     sso_client: SSOAdminClient,
     identitystore_client: IdentityStoreClient,
     slack_client: slack_sdk.WebClient,
+    thread_ts: str | None = None,
 ) -> SlackResponse:
     mention = slack_helpers.create_slack_mention_by_principal_id(
         sso_user_id=group_assignment.user_principal_id,
@@ -217,6 +220,7 @@ def slack_notify_user_on_group_access_revoke(  # noqa: PLR0913
     return slack_client.chat_postMessage(
         channel=cfg.slack_channel_id,
         text=f"User {mention} has been removed from the group {group_assignment.group_name}.",
+        thread_ts=thread_ts,
     )
 
 
@@ -270,6 +274,7 @@ def handle_scheduled_account_assignment_deletion(  # noqa: PLR0913
             sso_client=sso_client,
             identitystore_client=identitystore_client,
             slack_client=slack_client,
+            thread_ts=revoke_event.thread_ts,
         )
 
 
@@ -307,6 +312,7 @@ def handle_scheduled_group_assignment_deletion(  # noqa: PLR0913
             sso_client=sso_client,
             identitystore_client=identitystore_client,
             slack_client=slack_client,
+            thread_ts=group_revoke_event.thread_ts,
         )
 
 
diff --git a/src/schedule.py b/src/schedule.py
index 6b2ffa3..01eb3ca 100644
--- a/src/schedule.py
+++ b/src/schedule.py
@@ -137,6 +137,7 @@ def schedule_revoke_event(
     approver: entities.slack.User,
     requester: entities.slack.User,
     user_account_assignment: sso.UserAccountAssignment,
+    thread_ts: str | None = None,
 ) -> scheduler_type_defs.CreateScheduleOutputTypeDef:
     logger.info("Scheduling revoke event")
     schedule_name = f"{cfg.revoker_function_name}" + datetime.now(timezone.utc).strftime("%Y-%m-%d-%H-%M-%S")
@@ -147,6 +148,7 @@ def schedule_revoke_event(
         requester=requester,
         user_account_assignment=user_account_assignment,
         permission_duration=permission_duration,
+        thread_ts=thread_ts,
     )
     logger.debug("Creating schedule", extra={"revoke_event": revoke_event})
     return schedule_client.create_schedule(
@@ -175,6 +177,7 @@ def schedule_group_revoke_event(
     approver: entities.slack.User,
     requester: entities.slack.User,
     group_assignment: sso.GroupAssignment,
+    thread_ts: str | None = None,
 ) -> scheduler_type_defs.CreateScheduleOutputTypeDef:
     logger.info("Scheduling revoke event")
     schedule_name = f"{cfg.revoker_function_name}" + datetime.now(timezone.utc).strftime("%Y-%m-%d-%H-%M-%S")
@@ -184,6 +187,7 @@ def schedule_group_revoke_event(
         requester=requester,
         group_assignment=group_assignment,
         permission_duration=permission_duration,
+        thread_ts=thread_ts,
     )
     get_and_delete_scheduled_revoke_event_if_already_exist(schedule_client, group_assignment)
     logger.debug("Creating schedule", extra={"revoke_event": revoke_event})
diff --git a/src/tests/test_model_serialization.py b/src/tests/test_model_serialization.py
index bef1182..03af46b 100644
--- a/src/tests/test_model_serialization.py
+++ b/src/tests/test_model_serialization.py
@@ -1,6 +1,17 @@
 """Tests for model serialization, particularly handling frozensets with nested Pydantic models."""
 
+from datetime import timedelta
+
+import entities
+import sso
 from access_control import AccessRequestDecision, ApproveRequestDecision, DecisionReason
+from events import (
+    Event,
+    GroupRevokeEvent,
+    RevokeEvent,
+    ScheduledGroupRevokeEvent,
+    ScheduledRevokeEvent,
+)
 from statement import Statement, GroupStatement
 
 
@@ -174,3 +185,138 @@ def test_group_statement_dict_serialization(self):
         assert isinstance(result["approvers"], list)
         assert result["allow_self_approval"] is False
         assert result["approval_is_not_required"] is True
+
+
+class TestRevokeEventSerialization:
+    """Test that RevokeEvent and GroupRevokeEvent serialize thread_ts correctly through EventBridge payload."""
+
+    def _sample_user(self):
+        return entities.slack.User(email="user@example.com", id="U123", real_name="Test User")
+
+    def _sample_user_account_assignment(self):
+        return sso.UserAccountAssignment(
+            instance_arn="arn:aws:sso:::instance/ssoins-123",
+            account_id="123456789012",
+            permission_set_arn="arn:aws:sso:::permissionSet/ssoins-123/ps-123",
+            user_principal_id="user-principal-123",
+        )
+
+    def _sample_group_assignment(self):
+        return sso.GroupAssignment(
+            identity_store_id="d-123456789",
+            group_name="TestGroup",
+            group_id="group-123",
+            user_principal_id="user-principal-123",
+            membership_id="membership-123",
+        )
+
+    def test_revoke_event_with_thread_ts_json_roundtrip(self):
+        """Test RevokeEvent preserves thread_ts through JSON serialization (EventBridge payload)."""
+        event = RevokeEvent(
+            schedule_name="test-schedule",
+            approver=self._sample_user(),
+            requester=self._sample_user(),
+            user_account_assignment=self._sample_user_account_assignment(),
+            permission_duration=timedelta(hours=1),
+            thread_ts="1234567890.123456",
+        )
+
+        # Serialize to JSON (mimics EventBridge payload)
+        json_str = event.json()
+
+        # Deserialize back
+        restored = RevokeEvent.model_validate_json(json_str)
+
+        assert restored.thread_ts == "1234567890.123456"
+
+    def test_revoke_event_without_thread_ts_backward_compat(self):
+        """Test RevokeEvent works without thread_ts (older scheduled jobs)."""
+        # JSON without thread_ts field (simulates older scheduled jobs)
+        event = RevokeEvent(
+            schedule_name="test-schedule",
+            approver=self._sample_user(),
+            requester=self._sample_user(),
+            user_account_assignment=self._sample_user_account_assignment(),
+            permission_duration=timedelta(hours=1),
+        )
+
+        json_str = event.json()
+        restored = RevokeEvent.model_validate_json(json_str)
+
+        assert restored.thread_ts is None
+
+    def test_group_revoke_event_with_thread_ts_json_roundtrip(self):
+        """Test GroupRevokeEvent preserves thread_ts through JSON serialization."""
+        event = GroupRevokeEvent(
+            schedule_name="test-schedule",
+            approver=self._sample_user(),
+            requester=self._sample_user(),
+            group_assignment=self._sample_group_assignment(),
+            permission_duration=timedelta(hours=1),
+            thread_ts="1234567890.654321",
+        )
+
+        json_str = event.json()
+        restored = GroupRevokeEvent.model_validate_json(json_str)
+
+        assert restored.thread_ts == "1234567890.654321"
+
+    def test_group_revoke_event_without_thread_ts_backward_compat(self):
+        """Test GroupRevokeEvent works without thread_ts (older scheduled jobs)."""
+        event = GroupRevokeEvent(
+            schedule_name="test-schedule",
+            approver=self._sample_user(),
+            requester=self._sample_user(),
+            group_assignment=self._sample_group_assignment(),
+            permission_duration=timedelta(hours=1),
+        )
+
+        json_str = event.json()
+        restored = GroupRevokeEvent.model_validate_json(json_str)
+
+        assert restored.thread_ts is None
+
+    def test_scheduled_revoke_event_parses_thread_ts_from_nested_json(self):
+        """Test ScheduledRevokeEvent model_validator preserves thread_ts from JSON string."""
+        revoke_event = RevokeEvent(
+            schedule_name="test-schedule",
+            approver=self._sample_user(),
+            requester=self._sample_user(),
+            user_account_assignment=self._sample_user_account_assignment(),
+            permission_duration=timedelta(hours=1),
+            thread_ts="1234567890.999999",
+        )
+
+        # This mimics the EventBridge payload structure where revoke_event is a JSON string
+        payload = {
+            "action": "event_bridge_revoke",
+            "revoke_event": revoke_event.json(),
+        }
+
+        # Parse using Event (the root model used in revoker.py)
+        parsed = Event.model_validate(payload)
+
+        assert isinstance(parsed.root, ScheduledRevokeEvent)
+        assert parsed.root.revoke_event.thread_ts == "1234567890.999999"
+
+    def test_scheduled_group_revoke_event_parses_thread_ts_from_nested_json(self):
+        """Test ScheduledGroupRevokeEvent model_validator preserves thread_ts from JSON string."""
+        group_revoke_event = GroupRevokeEvent(
+            schedule_name="test-schedule",
+            approver=self._sample_user(),
+            requester=self._sample_user(),
+            group_assignment=self._sample_group_assignment(),
+            permission_duration=timedelta(hours=1),
+            thread_ts="1234567890.111111",
+        )
+
+        # This mimics the EventBridge payload structure
+        payload = {
+            "action": "event_bridge_group_revoke",
+            "revoke_event": group_revoke_event.json(),
+        }
+
+        parsed = Event.model_validate(payload)
+
+        assert isinstance(parsed.root, ScheduledGroupRevokeEvent)
+        assert parsed.root.revoke_event.thread_ts == "1234567890.111111"