diff --git a/internal/configs/sharding/mainnet.go b/internal/configs/sharding/mainnet.go
index db5923ede..0179e0fcb 100644
--- a/internal/configs/sharding/mainnet.go
+++ b/internal/configs/sharding/mainnet.go
@@ -29,6 +29,8 @@ const (
 	mainnetV1_4Epoch = 46
 	mainnetV1_5Epoch = 54
 	mainnetV2_0Epoch = 185 // prestaking epoch
+	mainnetV2_1Epoch = 300 // open slots increase from 320 - 480  (TODO): update the epoch
+	mainnetV2_2Epoch = 300 // open slots increase from 480 - 640  (TODO): update the epoch
 
 	// MainNetHTTPPattern is the http pattern for mainnet.
 	MainNetHTTPPattern = "https://api.s%d.t.hmny.io"
@@ -43,6 +45,10 @@ type mainnetSchedule struct{}
 
 func (mainnetSchedule) InstanceForEpoch(epoch *big.Int) Instance {
 	switch {
+	case epoch.Cmp(big.NewInt(mainnetV2_2Epoch)) >= 0:
+		return mainnetV2_2
+	case epoch.Cmp(big.NewInt(mainnetV2_1Epoch)) >= 0:
+		return mainnetV2_1
 	case epoch.Cmp(big.NewInt(mainnetV2_0Epoch)) >= 0:
 		// 185 resharding epoch (for shard 0) around 14/05/2020 ~15:00 PDT
 		return mainnetV2_0
@@ -141,7 +147,7 @@ func (ms mainnetSchedule) GetShardingStructure(numShard, shardID int) []map[stri
 	return genShardingStructure(numShard, shardID, MainNetHTTPPattern, MainNetWSPattern)
 }
 
-var mainnetReshardingEpoch = []*big.Int{big.NewInt(0), big.NewInt(mainnetV0_1Epoch), big.NewInt(mainnetV0_2Epoch), big.NewInt(mainnetV0_3Epoch), big.NewInt(mainnetV0_4Epoch), big.NewInt(mainnetV1Epoch), big.NewInt(mainnetV1_1Epoch), big.NewInt(mainnetV1_2Epoch), big.NewInt(mainnetV1_3Epoch), big.NewInt(mainnetV1_4Epoch), big.NewInt(mainnetV1_5Epoch), big.NewInt(mainnetV2_0Epoch)}
+var mainnetReshardingEpoch = []*big.Int{big.NewInt(0), big.NewInt(mainnetV0_1Epoch), big.NewInt(mainnetV0_2Epoch), big.NewInt(mainnetV0_3Epoch), big.NewInt(mainnetV0_4Epoch), big.NewInt(mainnetV1Epoch), big.NewInt(mainnetV1_1Epoch), big.NewInt(mainnetV1_2Epoch), big.NewInt(mainnetV1_3Epoch), big.NewInt(mainnetV1_4Epoch), big.NewInt(mainnetV1_5Epoch), big.NewInt(mainnetV2_0Epoch), big.NewInt(mainnetV2_1Epoch), big.NewInt(mainnetV2_2Epoch)}
 
 var (
 	mainnetV0   = MustNewInstance(4, 150, 112, numeric.OneDec(), genesis.HarmonyAccounts, genesis.FoundationalNodeAccounts, mainnetReshardingEpoch, MainnetSchedule.BlocksPerEpoch())
@@ -156,4 +162,6 @@ var (
 	mainnetV1_4 = MustNewInstance(4, 250, 170, numeric.OneDec(), genesis.HarmonyAccounts, genesis.FoundationalNodeAccountsV1_4, mainnetReshardingEpoch, MainnetSchedule.BlocksPerEpoch())
 	mainnetV1_5 = MustNewInstance(4, 250, 170, numeric.OneDec(), genesis.HarmonyAccounts, genesis.FoundationalNodeAccountsV1_5, mainnetReshardingEpoch, MainnetSchedule.BlocksPerEpoch())
 	mainnetV2_0 = MustNewInstance(4, 250, 170, numeric.MustNewDecFromStr("0.68"), genesis.HarmonyAccounts, genesis.FoundationalNodeAccountsV1_5, mainnetReshardingEpoch, MainnetSchedule.BlocksPerEpoch())
+	mainnetV2_1 = MustNewInstance(4, 250, 130, numeric.MustNewDecFromStr("0.68"), genesis.HarmonyAccounts, genesis.FoundationalNodeAccountsV1_5, mainnetReshardingEpoch, MainnetSchedule.BlocksPerEpoch())
+	mainnetV2_2 = MustNewInstance(4, 250, 90, numeric.MustNewDecFromStr("0.68"), genesis.HarmonyAccounts, genesis.FoundationalNodeAccountsV1_5, mainnetReshardingEpoch, MainnetSchedule.BlocksPerEpoch())
 )