diff --git a/error/error.go b/error/error.go
index 671f6693..3d7272d4 100644
--- a/error/error.go
+++ b/error/error.go
@@ -155,13 +155,14 @@ func IsErrWriteConflict(err error) bool {
 	return errors.As(err, &e)
 }
 
-//NewErrWriteConfictWithArgs generates an ErrWriteConflict with args.
-func NewErrWriteConfictWithArgs(startTs, conflictTs, conflictCommitTs uint64, key []byte) *ErrWriteConflict {
+// NewErrWriteConflictWithArgs generates an ErrWriteConflict with args.
+func NewErrWriteConflictWithArgs(startTs, conflictTs, conflictCommitTs uint64, key []byte, reason kvrpcpb.WriteConflict_Reason) *ErrWriteConflict {
 	conflict := kvrpcpb.WriteConflict{
 		StartTs:          startTs,
 		ConflictTs:       conflictTs,
 		Key:              key,
 		ConflictCommitTs: conflictCommitTs,
+		Reason:           reason,
 	}
 	return &ErrWriteConflict{WriteConflict: &conflict}
 }
diff --git a/go.mod b/go.mod
index 530bc0bd..f489053d 100644
--- a/go.mod
+++ b/go.mod
@@ -13,7 +13,7 @@ require (
 	github.com/opentracing/opentracing-go v1.2.0
 	github.com/pingcap/failpoint v0.0.0-20210918120811-547c13e3eb00
 	github.com/pingcap/goleveldb v0.0.0-20191226122134-f82aafb29989
-	github.com/pingcap/kvproto v0.0.0-20220906053631-2e37953b2b43
+	github.com/pingcap/kvproto v0.0.0-20220908075542-7c004f4daf21
 	github.com/pingcap/log v0.0.0-20211215031037-e024ba4eb0ee
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.11.0
diff --git a/go.sum b/go.sum
index b05d8c4d..5825f68d 100644
--- a/go.sum
+++ b/go.sum
@@ -155,8 +155,8 @@ github.com/pingcap/failpoint v0.0.0-20210918120811-547c13e3eb00/go.mod h1:4qGtCB
 github.com/pingcap/goleveldb v0.0.0-20191226122134-f82aafb29989 h1:surzm05a8C9dN8dIUmo4Be2+pMRb6f55i+UIYrluu2E=
 github.com/pingcap/goleveldb v0.0.0-20191226122134-f82aafb29989/go.mod h1:O17XtbryoCJhkKGbT62+L2OlrniwqiGLSqrmdHCMzZw=
 github.com/pingcap/kvproto v0.0.0-20220510035547-0e2f26c0a46a/go.mod h1:OYtxs0786qojVTmkVeufx93xe+jUgm56GUYRIKnmaGI=
-github.com/pingcap/kvproto v0.0.0-20220906053631-2e37953b2b43 h1:5q7Ns0R7q6Uj+fpa3lDTijrcqgId4lNdGa2AG7izB5c=
-github.com/pingcap/kvproto v0.0.0-20220906053631-2e37953b2b43/go.mod h1:OYtxs0786qojVTmkVeufx93xe+jUgm56GUYRIKnmaGI=
+github.com/pingcap/kvproto v0.0.0-20220908075542-7c004f4daf21 h1:HfAWnlVF7P1nNJvXP4ew1Lcnng/BnAVQ40AsUHKR5EA=
+github.com/pingcap/kvproto v0.0.0-20220908075542-7c004f4daf21/go.mod h1:OYtxs0786qojVTmkVeufx93xe+jUgm56GUYRIKnmaGI=
 github.com/pingcap/log v0.0.0-20211215031037-e024ba4eb0ee h1:VO2t6IBpfvW34TdtD/G10VvnGqjLic1jzOuHjUb5VqM=
 github.com/pingcap/log v0.0.0-20211215031037-e024ba4eb0ee/go.mod h1:DWQW5jICDR7UJh4HtxXSM20Churx4CQL0fwL/SoOSA4=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
diff --git a/integration_tests/go.mod b/integration_tests/go.mod
index 88fc64b6..c86c26c8 100644
--- a/integration_tests/go.mod
+++ b/integration_tests/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/ninedraft/israce v0.0.3
 	github.com/pingcap/errors v0.11.5-0.20211224045212-9687c2b0f87c
 	github.com/pingcap/failpoint v0.0.0-20220423142525-ae43b7f4e5c3
-	github.com/pingcap/kvproto v0.0.0-20220906053631-2e37953b2b43
+	github.com/pingcap/kvproto v0.0.0-20220908075542-7c004f4daf21
 	github.com/pingcap/tidb v1.1.0-beta.0.20220902042024-0482b2e83ed2
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.8.0
diff --git a/integration_tests/go.sum b/integration_tests/go.sum
index 00f7a850..6fe79bbe 100644
--- a/integration_tests/go.sum
+++ b/integration_tests/go.sum
@@ -301,8 +301,8 @@ github.com/pingcap/fn v0.0.0-20200306044125-d5540d389059 h1:Pe2LbxRmbTfAoKJ65bZL
 github.com/pingcap/goleveldb v0.0.0-20191226122134-f82aafb29989 h1:surzm05a8C9dN8dIUmo4Be2+pMRb6f55i+UIYrluu2E=
 github.com/pingcap/goleveldb v0.0.0-20191226122134-f82aafb29989/go.mod h1:O17XtbryoCJhkKGbT62+L2OlrniwqiGLSqrmdHCMzZw=
 github.com/pingcap/kvproto v0.0.0-20220510035547-0e2f26c0a46a/go.mod h1:OYtxs0786qojVTmkVeufx93xe+jUgm56GUYRIKnmaGI=
-github.com/pingcap/kvproto v0.0.0-20220906053631-2e37953b2b43 h1:5q7Ns0R7q6Uj+fpa3lDTijrcqgId4lNdGa2AG7izB5c=
-github.com/pingcap/kvproto v0.0.0-20220906053631-2e37953b2b43/go.mod h1:OYtxs0786qojVTmkVeufx93xe+jUgm56GUYRIKnmaGI=
+github.com/pingcap/kvproto v0.0.0-20220908075542-7c004f4daf21 h1:HfAWnlVF7P1nNJvXP4ew1Lcnng/BnAVQ40AsUHKR5EA=
+github.com/pingcap/kvproto v0.0.0-20220908075542-7c004f4daf21/go.mod h1:OYtxs0786qojVTmkVeufx93xe+jUgm56GUYRIKnmaGI=
 github.com/pingcap/log v0.0.0-20200511115504-543df19646ad/go.mod h1:4rbK1p9ILyIfb6hU7OG2CiWSqMXnp3JMbiaVJ6mvoY8=
 github.com/pingcap/log v0.0.0-20211215031037-e024ba4eb0ee/go.mod h1:DWQW5jICDR7UJh4HtxXSM20Churx4CQL0fwL/SoOSA4=
 github.com/pingcap/log v1.1.0 h1:ELiPxACz7vdo1qAvvaWJg1NrYFoY6gqAh/+Uo6aXdD8=
diff --git a/txnkv/transaction/prewrite.go b/txnkv/transaction/prewrite.go
index d375abc7..7bf4e00d 100644
--- a/txnkv/transaction/prewrite.go
+++ b/txnkv/transaction/prewrite.go
@@ -395,7 +395,7 @@ func (action actionPrewrite) handleSingleBatch(c *twoPhaseCommitter, bo *retry.B
 			// TiKV will return a PessimisticLockNotFound error directly if it encounters a different lock. Otherwise,
 			// TiKV returns lock.TTL = 0, and we still need to resolve the lock.
 			if lock.TxnID > c.startTS && !c.isPessimistic {
-				return tikverr.NewErrWriteConfictWithArgs(c.startTS, lock.TxnID, 0, lock.Key)
+				return tikverr.NewErrWriteConflictWithArgs(c.startTS, lock.TxnID, 0, lock.Key, kvrpcpb.WriteConflict_Optimistic)
 			}
 			locks = append(locks, lock)
 		}