diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 751d916bf..28e7715f4 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -46,7 +46,7 @@ import (
 // Tuning parameters.
 const (
 	headerBatchCount = 2000
-	version          = "0.2.4"
+	version          = "0.2.5"
 
 	defaultInitialGAS                      = 52000000_00000000
 	defaultGCPeriod                        = 10000
diff --git a/pkg/core/dao/dao.go b/pkg/core/dao/dao.go
index 23ca3bb68..505e589dc 100644
--- a/pkg/core/dao/dao.go
+++ b/pkg/core/dao/dao.go
@@ -99,7 +99,7 @@ func (dao *Simple) putWithBuffer(entity io.Serializable, key []byte, buf *io.Buf
 func (dao *Simple) makeContractIDKey(id int32) []byte {
 	key := dao.getKeyBuf(5)
 	key[0] = byte(storage.STContractID)
-	binary.LittleEndian.PutUint32(key[1:], uint32(id))
+	binary.BigEndian.PutUint32(key[1:], uint32(id))
 	return key
 }