diff --git a/x/plugin/gov_plugin.go b/x/plugin/gov_plugin.go
index cb64fe0703..b3539ebd4f 100644
--- a/x/plugin/gov_plugin.go
+++ b/x/plugin/gov_plugin.go
@@ -149,6 +149,12 @@ func (govPlugin *GovPlugin) BeginBlock(blockHash common.Hash, header *types.Head
 				}
 				log.Info("Successfully upgraded the new version 1.3.0", "blockNumber", blockNumber, "blockHash", blockHash, "preActiveProposalID", preActiveVersionProposalID)
 			}
+			if versionProposal.NewVersion == params.FORKVERSION_1_5_0 {
+				if err := gov.UpdateGovernParamValue(gov.ModuleStaking, gov.KeyMaxValidators, fmt.Sprint(xcom.MaxValidatorsForVersion150), blockNumber+1, blockHash); err != nil {
+					return err
+				}
+				log.Info("Successfully upgraded the new version 1.5.0", "blockNumber", blockNumber, "blockHash", blockHash)
+			}
 
 			log.Info("version proposal is active", "blockNumber", blockNumber, "proposalID", versionProposal.ProposalID, "newVersion", versionProposal.NewVersion, "newVersionString", xutil.ProgramVersion2Str(versionProposal.NewVersion))
 		}
diff --git a/x/xcom/common_config.go b/x/xcom/common_config.go
index f17d0dff54..afcbeb57f9 100644
--- a/x/xcom/common_config.go
+++ b/x/xcom/common_config.go
@@ -20,11 +20,12 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/PlatONnetwork/PlatON-Go/params"
-	"github.com/PlatONnetwork/PlatON-Go/rlp"
 	"math/big"
 	"sync"
 
+	"github.com/PlatONnetwork/PlatON-Go/params"
+	"github.com/PlatONnetwork/PlatON-Go/rlp"
+
 	"github.com/PlatONnetwork/PlatON-Go/log"
 
 	"github.com/PlatONnetwork/PlatON-Go/common"
@@ -69,6 +70,8 @@ const (
 	ElectionBasePIP3 = 43
 
 	MainNetECHash = "0x259176769541cdb61bc19806cbf5a3f3489f4829b6b69f804f45f947a0c9c3e9"
+
+	MaxValidatorsForVersion150 = 225
 )
 
 var (