diff --git a/session/pessimistic_test.go b/session/pessimistic_test.go
index 961b1d538716a..1e1b597b7058a 100644
--- a/session/pessimistic_test.go
+++ b/session/pessimistic_test.go
@@ -2119,6 +2119,7 @@ func (s *testPessimisticSuite) TestAsyncCommitWithSchemaChange(c *C) {
 }
 
 func (s *testPessimisticSuite) Test1PCWithSchemaChange(c *C) {
+	c.Skip("unstable")
 	// TODO: implement commit_ts calculation in unistore
 	if !*withTiKV {
 		return
@@ -2470,7 +2471,6 @@ func (s *testPessimisticSuite) TestIssue21498(c *C) {
 }
 
 func (s *testPessimisticSuite) TestPlanCacheSchemaChange(c *C) {
-	c.Skip("unstable")
 	orgEnable := plannercore.PreparedPlanCacheEnabled()
 	defer func() {
 		plannercore.SetPreparedPlanCache(orgEnable)