diff --git a/commonspace/object/acl/syncacl/syncaclhandler.go b/commonspace/object/acl/syncacl/syncaclhandler.go
index 709a6fb0..46cb62fa 100644
--- a/commonspace/object/acl/syncacl/syncaclhandler.go
+++ b/commonspace/object/acl/syncacl/syncaclhandler.go
@@ -11,6 +11,7 @@ import (
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
 	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"github.com/anyproto/any-sync/net/secureservice"
 )
 
 var (
@@ -58,7 +59,18 @@ func (s *syncAclHandler) HandleMessage(ctx context.Context, senderId string, pro
 	case content.GetFullSyncRequest() != nil:
 		return ErrMessageIsRequest
 	case content.GetFullSyncResponse() != nil:
-		return s.syncProtocol.FullSyncResponse(ctx, senderId, content.GetFullSyncResponse())
+		err := s.syncProtocol.FullSyncResponse(ctx, senderId, content.GetFullSyncResponse())
+		if err != nil {
+			return err
+		}
+		if protoVersion <= secureservice.ProtoVersion || s.aclList.Head().Id == head {
+			return nil
+		}
+		req, err := s.syncClient.CreateFullSyncRequest(s.aclList, head)
+		if err != nil {
+			return err
+		}
+		return s.syncClient.QueueRequest(senderId, req)
 	}
 	return
 }
diff --git a/commonspace/object/acl/syncacl/syncaclhandler_test.go b/commonspace/object/acl/syncacl/syncaclhandler_test.go
index 4fe5536a..7259a6e8 100644
--- a/commonspace/object/acl/syncacl/syncaclhandler_test.go
+++ b/commonspace/object/acl/syncacl/syncaclhandler_test.go
@@ -10,11 +10,13 @@ import (
 	"github.com/stretchr/testify/require"
 	"go.uber.org/mock/gomock"
 
+	"github.com/anyproto/any-sync/commonspace/object/acl/list"
 	"github.com/anyproto/any-sync/commonspace/object/acl/list/mock_list"
 	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl/mock_syncacl"
 	"github.com/anyproto/any-sync/commonspace/spacesyncproto"
 	"github.com/anyproto/any-sync/commonspace/syncstatus"
 	"github.com/anyproto/any-sync/consensus/consensusproto"
+	"github.com/anyproto/any-sync/net/secureservice"
 )
 
 type testAclMock struct {
@@ -182,6 +184,43 @@ func TestSyncAclHandler_HandleMessage(t *testing.T) {
 		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, 0, objectMsg)
 		require.NoError(t, err)
 	})
+	t.Run("handle full sync response, new protocol, not equal heads", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullResponse := &consensusproto.LogFullSyncResponse{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapFullResponse(fullResponse, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().Head().AnyTimes().Return(&list.AclRecord{Id: "h2"})
+		fx.syncProtocolMock.EXPECT().FullSyncResponse(ctx, fx.senderId, gomock.Any()).Return(nil)
+		req := &consensusproto.LogSyncMessage{}
+		fx.syncClientMock.EXPECT().CreateFullSyncRequest(fx.aclMock, "h1").Return(req, nil)
+		fx.syncClientMock.EXPECT().QueueRequest(fx.senderId, req).Return(nil)
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, secureservice.NewSyncProtoVersion, objectMsg)
+		require.NoError(t, err)
+	})
+	t.Run("handle full sync response, new protocol, equal heads", func(t *testing.T) {
+		fx := newSyncHandlerFixture(t)
+		defer fx.stop()
+		chWithId := &consensusproto.RawRecordWithId{}
+		fullResponse := &consensusproto.LogFullSyncResponse{
+			Head:    "h1",
+			Records: []*consensusproto.RawRecordWithId{chWithId},
+		}
+		logMessage := consensusproto.WrapFullResponse(fullResponse, chWithId)
+		objectMsg, _ := spacesyncproto.MarshallSyncMessage(logMessage, fx.spaceId, fx.aclId)
+
+		fx.aclMock.EXPECT().Id().AnyTimes().Return(fx.aclId)
+		fx.aclMock.EXPECT().Head().AnyTimes().Return(&list.AclRecord{Id: "h1"})
+		fx.syncProtocolMock.EXPECT().FullSyncResponse(ctx, fx.senderId, gomock.Any()).Return(nil)
+		err := fx.syncHandler.HandleMessage(ctx, fx.senderId, secureservice.NewSyncProtoVersion, objectMsg)
+		require.NoError(t, err)
+	})
 }
 
 func TestSyncAclHandler_HandleRequest(t *testing.T) {
diff --git a/commonspace/object/tree/synctree/synctreehandler.go b/commonspace/object/tree/synctree/synctreehandler.go
index 0e5a053c..3a82e1b9 100644
--- a/commonspace/object/tree/synctree/synctreehandler.go
+++ b/commonspace/object/tree/synctree/synctreehandler.go
@@ -143,11 +143,8 @@ func (s *syncTreeHandler) handleMessage(ctx context.Context, msg *treechangeprot
 		if err != nil {
 			return err
 		}
-		if protoVersion <= secureservice.ProtoVersion {
-			return nil
-		}
 		cnt := content.GetFullSyncResponse()
-		if slice.UnsortedEquals(cnt.Heads, s.objTree.Heads()) {
+		if protoVersion <= secureservice.ProtoVersion || slice.UnsortedEquals(cnt.Heads, s.objTree.Heads()) {
 			return nil
 		}
 		req, err := s.syncClient.CreateFullSyncRequest(s.objTree, cnt.Heads, cnt.SnapshotPath)