diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c8575a4f2..ef1ea8761d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -62,6 +62,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 - (rpc) [#1685](https://github.com/evmos/ethermint/pull/1685) Fix parse for websocket connID.
 - (rpc) [#1773](https://github.com/evmos/ethermint/pull/1773) Avoid channel get changed when concurrent subscribe happens.
 * (mempool) [#310](https://github.com/crypto-org-chain/ethermint/pull/310) disable vesting messages in check tx mode.
+* (rpc) [#364](https://github.com/crypto-org-chain/ethermint/pull/364) Only use NextBaseFee as last item to avoid concurrent write in `eth_feeHistory`.
 
 ### Improvements
 
diff --git a/cmd/ethermintd/root.go b/cmd/ethermintd/root.go
index 12ef6471a1..1665b73ce8 100644
--- a/cmd/ethermintd/root.go
+++ b/cmd/ethermintd/root.go
@@ -174,6 +174,7 @@ func queryCommand() *cobra.Command {
 		rpc.BlockCommand(),
 		authcmd.QueryTxsByEventsCmd(),
 		authcmd.QueryTxCmd(),
+		rpc.QueryEventForTxCmd(),
 	)
 
 	app.ModuleBasics.AddQueryCommands(cmd)
diff --git a/rpc/backend/backend.go b/rpc/backend/backend.go
index e73ce8634b..29b7925821 100644
--- a/rpc/backend/backend.go
+++ b/rpc/backend/backend.go
@@ -32,6 +32,7 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/signer/core/apitypes"
+	"github.com/evmos/ethermint/rpc/types"
 	rpctypes "github.com/evmos/ethermint/rpc/types"
 	"github.com/evmos/ethermint/server/config"
 	ethermint "github.com/evmos/ethermint/types"
@@ -144,6 +145,14 @@ var _ BackendI = (*Backend)(nil)
 
 var bAttributeKeyEthereumBloom = []byte(evmtypes.AttributeKeyEthereumBloom)
 
+type ProcessBlocker func(
+	tendermintBlock *tmrpctypes.ResultBlock,
+	ethBlock *map[string]interface{},
+	rewardPercentiles []float64,
+	tendermintBlockResult *tmrpctypes.ResultBlockResults,
+	targetOneFeeHistory *types.OneFeeHistory,
+) error
+
 // Backend implements the BackendI interface
 type Backend struct {
 	ctx                 context.Context
@@ -154,6 +163,7 @@ type Backend struct {
 	cfg                 config.Config
 	allowUnprotectedTxs bool
 	indexer             ethermint.EVMTxIndexer
+	processBlocker      ProcessBlocker
 }
 
 // NewBackend creates a new Backend instance for cosmos and ethereum namespaces
@@ -174,7 +184,7 @@ func NewBackend(
 		panic(err)
 	}
 
-	return &Backend{
+	b := &Backend{
 		ctx:                 context.Background(),
 		clientCtx:           clientCtx,
 		queryClient:         rpctypes.NewQueryClient(clientCtx),
@@ -184,4 +194,6 @@ func NewBackend(
 		allowUnprotectedTxs: allowUnprotectedTxs,
 		indexer:             indexer,
 	}
+	b.processBlocker = b.processBlock
+	return b
 }
diff --git a/rpc/backend/chain_info.go b/rpc/backend/chain_info.go
index 9502e22e9a..aa3459a6df 100644
--- a/rpc/backend/chain_info.go
+++ b/rpc/backend/chain_info.go
@@ -252,7 +252,7 @@ func (b *Backend) FeeHistory(
 				}
 
 				oneFeeHistory := rpctypes.OneFeeHistory{}
-				err = b.processBlock(tendermintblock, &ethBlock, rewardPercentiles, tendermintBlockResult, &oneFeeHistory)
+				err = b.processBlocker(tendermintblock, &ethBlock, rewardPercentiles, tendermintBlockResult, &oneFeeHistory)
 				if err != nil {
 					chanErr <- err
 					return
@@ -260,7 +260,10 @@ func (b *Backend) FeeHistory(
 
 				// copy
 				thisBaseFee[index] = (*hexutil.Big)(oneFeeHistory.BaseFee)
-				thisBaseFee[index+1] = (*hexutil.Big)(oneFeeHistory.NextBaseFee)
+				// only use NextBaseFee as last item to avoid concurrent write
+				if int(index) == len(thisBaseFee)-2 {
+					thisBaseFee[index+1] = (*hexutil.Big)(oneFeeHistory.NextBaseFee)
+				}
 				thisGasUsedRatio[index] = oneFeeHistory.GasUsedRatio
 				if calculateRewards {
 					for j := 0; j < rewardCount; j++ {
diff --git a/rpc/backend/chain_info_test.go b/rpc/backend/chain_info_test.go
index eab4957353..1f94866486 100644
--- a/rpc/backend/chain_info_test.go
+++ b/rpc/backend/chain_info_test.go
@@ -320,13 +320,14 @@ func (suite *BackendTestSuite) TestGlobalMinGasPrice() {
 
 func (suite *BackendTestSuite) TestFeeHistory() {
 	testCases := []struct {
-		name           string
-		registerMock   func(validator sdk.AccAddress)
-		userBlockCount ethrpc.DecimalOrHex
-		latestBlock    ethrpc.BlockNumber
-		expFeeHistory  *rpc.FeeHistoryResult
-		validator      sdk.AccAddress
-		expPass        bool
+		name              string
+		registerMock      func(validator sdk.AccAddress)
+		userBlockCount    ethrpc.DecimalOrHex
+		latestBlock       ethrpc.BlockNumber
+		expFeeHistory     *rpc.FeeHistoryResult
+		validator         sdk.AccAddress
+		expPass           bool
+		targetNewBaseFees []*big.Int
 	}{
 		{
 			"fail - can't get params ",
@@ -341,6 +342,7 @@ func (suite *BackendTestSuite) TestFeeHistory() {
 			nil,
 			nil,
 			false,
+			nil,
 		},
 		{
 			"fail - user block count higher than max block count ",
@@ -355,6 +357,7 @@ func (suite *BackendTestSuite) TestFeeHistory() {
 			nil,
 			nil,
 			false,
+			nil,
 		},
 		{
 			"fail - Tendermint block fetching error ",
@@ -371,6 +374,7 @@ func (suite *BackendTestSuite) TestFeeHistory() {
 			nil,
 			nil,
 			false,
+			nil,
 		},
 		{
 			"fail - Eth block fetching error",
@@ -388,6 +392,7 @@ func (suite *BackendTestSuite) TestFeeHistory() {
 			nil,
 			nil,
 			true,
+			nil,
 		},
 		{
 			"fail - Invalid base fee",
@@ -409,6 +414,7 @@ func (suite *BackendTestSuite) TestFeeHistory() {
 			nil,
 			sdk.AccAddress(tests.GenerateAddress().Bytes()),
 			false,
+			nil,
 		},
 		{
 			"pass - Valid FeeHistoryResults object",
@@ -438,6 +444,39 @@ func (suite *BackendTestSuite) TestFeeHistory() {
 			},
 			sdk.AccAddress(tests.GenerateAddress().Bytes()),
 			true,
+			nil,
+		},
+		{
+			"pass - Concurrent FeeHistoryResults object",
+			func(validator sdk.AccAddress) {
+				var header metadata.MD
+				baseFee := sdk.NewInt(1)
+				queryClient := suite.backend.queryClient.QueryClient.(*mocks.EVMQueryClient)
+				fQueryClient := suite.backend.queryClient.FeeMarket.(*mocks.FeeMarketQueryClient)
+				client := suite.backend.clientCtx.Client.(*mocks.Client)
+				suite.backend.cfg.JSONRPC.FeeHistoryCap = 2
+				RegisterBlock(client, ethrpc.BlockNumber(1).Int64(), nil)
+				RegisterBlockResults(client, 1)
+				RegisterBaseFee(queryClient, baseFee)
+				RegisterValidatorAccount(queryClient, validator)
+				RegisterConsensusParams(client, 1)
+				RegisterParams(queryClient, &header, 1)
+				RegisterParamsWithoutHeader(queryClient, 1)
+				RegisterFeeMarketParams(fQueryClient, 1)
+			},
+			1,
+			1,
+			&rpc.FeeHistoryResult{
+				OldestBlock:  (*hexutil.Big)(big.NewInt(1)),
+				BaseFee:      []*hexutil.Big{(*hexutil.Big)(big.NewInt(1)), (*hexutil.Big)(big.NewInt(0))},
+				GasUsedRatio: []float64{0},
+				Reward:       [][]*hexutil.Big{{(*hexutil.Big)(big.NewInt(0)), (*hexutil.Big)(big.NewInt(0)), (*hexutil.Big)(big.NewInt(0)), (*hexutil.Big)(big.NewInt(0))}},
+			},
+			sdk.AccAddress(tests.GenerateAddress().Bytes()),
+			true,
+			[]*big.Int{
+				big.NewInt(0), // for overwrite overlap
+			},
 		},
 	}
 
@@ -446,6 +485,22 @@ func (suite *BackendTestSuite) TestFeeHistory() {
 			suite.SetupTest() // reset test and queries
 			tc.registerMock(tc.validator)
 
+			called := 0
+			if len(tc.targetNewBaseFees) > 0 {
+				suite.backend.processBlocker = func(
+					tendermintBlock *tmrpctypes.ResultBlock,
+					ethBlock *map[string]interface{},
+					rewardPercentiles []float64,
+					tendermintBlockResult *tmrpctypes.ResultBlockResults,
+					targetOneFeeHistory *rpc.OneFeeHistory,
+				) error {
+					suite.backend.processBlock(tendermintBlock, ethBlock, rewardPercentiles, tendermintBlockResult, targetOneFeeHistory)
+					targetOneFeeHistory.NextBaseFee = tc.targetNewBaseFees[called]
+					called += 1
+					return nil
+				}
+			}
+
 			feeHistory, err := suite.backend.FeeHistory(tc.userBlockCount, tc.latestBlock, []float64{25, 50, 75, 100})
 			if tc.expPass {
 				suite.Require().NoError(err)
diff --git a/tests/integration_tests/configs/cosmovisor.jsonnet b/tests/integration_tests/configs/cosmovisor.jsonnet
index dc3cb1a4a2..9ab20f617f 100644
--- a/tests/integration_tests/configs/cosmovisor.jsonnet
+++ b/tests/integration_tests/configs/cosmovisor.jsonnet
@@ -12,6 +12,20 @@ config {
             base_fee:: super.base_fee,
           },
         },
+        gov: {
+          voting_params: {
+            voting_period: '10s',
+          },
+          deposit_params: {
+            max_deposit_period: '10s',
+            min_deposit: [
+              {
+                denom: 'aphoton',
+                amount: '1',
+              },
+            ],
+          },
+        },
       },
     },
   },
diff --git a/tests/integration_tests/configs/default.jsonnet b/tests/integration_tests/configs/default.jsonnet
index 8dca8f3c40..6a7e2a81af 100644
--- a/tests/integration_tests/configs/default.jsonnet
+++ b/tests/integration_tests/configs/default.jsonnet
@@ -57,10 +57,8 @@
           },
         },
         gov: {
-          voting_params: {
+          params: {
             voting_period: '10s',
-          },
-          deposit_params: {
             max_deposit_period: '10s',
             min_deposit: [
               {
diff --git a/tests/integration_tests/cosmoscli.py b/tests/integration_tests/cosmoscli.py
index 75c818f989..8c8564c256 100644
--- a/tests/integration_tests/cosmoscli.py
+++ b/tests/integration_tests/cosmoscli.py
@@ -1,4 +1,5 @@
 import json
+import subprocess
 import tempfile
 
 import requests
@@ -13,10 +14,10 @@ class ChainCommand:
     def __init__(self, cmd):
         self.cmd = cmd
 
-    def __call__(self, cmd, *args, stdin=None, **kwargs):
+    def __call__(self, cmd, *args, stdin=None, stderr=subprocess.STDOUT, **kwargs):
         "execute chain-maind"
         args = " ".join(build_cli_args_safe(cmd, *args, **kwargs))
-        return interact(f"{self.cmd} {args}", input=stdin)
+        return interact(f"{self.cmd} {args}", input=stdin, stderr=stderr)
 
 
 class CosmosCLI:
@@ -700,6 +701,7 @@ def gov_propose(self, proposer, kind, proposal, **kwargs):
 
     def gov_vote(self, voter, proposal_id, option, **kwargs):
         kwargs.setdefault("gas_prices", DEFAULT_GAS_PRICE)
+        kwargs.setdefault("broadcast_mode", "sync")
         return json.loads(
             self.raw(
                 "tx",
@@ -839,3 +841,38 @@ def rollback(self):
 
     def migrate_keystore(self):
         return self.raw("keys", "migrate", home=self.data_dir)
+
+    def get_default_kwargs(self):
+        return {
+            "gas_prices": DEFAULT_GAS_PRICE,
+            "gas": "auto",
+            "gas_adjustment": "1.5",
+        }
+
+    def event_query_tx_for(self, hash):
+        return json.loads(
+            self.raw(
+                "query",
+                "event-query-tx-for",
+                hash,
+                "-y",
+                home=self.data_dir,
+                stderr=subprocess.DEVNULL,
+            )
+        )
+
+    def submit_gov_proposal(self, proposal, **kwargs):
+        default_kwargs = self.get_default_kwargs()
+        kwargs.setdefault("broadcast_mode", "sync")
+        return json.loads(
+            self.raw(
+                "tx",
+                "gov",
+                "submit-proposal",
+                proposal,
+                "-y",
+                home=self.data_dir,
+                stderr=subprocess.DEVNULL,
+                **(default_kwargs | kwargs),
+            )
+        )
diff --git a/tests/integration_tests/poetry.lock b/tests/integration_tests/poetry.lock
index 18ed1bb10d..1555fd2167 100644
--- a/tests/integration_tests/poetry.lock
+++ b/tests/integration_tests/poetry.lock
@@ -866,64 +866,70 @@ files = [
 
 [[package]]
 name = "grpcio"
-version = "1.50.0"
+version = "1.59.0"
 description = "HTTP/2-based RPC framework"
 category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "grpcio-1.50.0-cp310-cp310-linux_armv7l.whl", hash = "sha256:906f4d1beb83b3496be91684c47a5d870ee628715227d5d7c54b04a8de802974"},
-    {file = "grpcio-1.50.0-cp310-cp310-macosx_12_0_x86_64.whl", hash = "sha256:2d9fd6e38b16c4d286a01e1776fdf6c7a4123d99ae8d6b3f0b4a03a34bf6ce45"},
-    {file = "grpcio-1.50.0-cp310-cp310-manylinux_2_17_aarch64.whl", hash = "sha256:4b123fbb7a777a2fedec684ca0b723d85e1d2379b6032a9a9b7851829ed3ca9a"},
-    {file = "grpcio-1.50.0-cp310-cp310-manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:b2f77a90ba7b85bfb31329f8eab9d9540da2cf8a302128fb1241d7ea239a5469"},
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-[package.dependencies]
-six = ">=1.5.2"
-
 [package.extras]
-protobuf = ["grpcio-tools (>=1.50.0)"]
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 multitail2 = "^1.5.2"
 python-dateutil = "^2.8.1"
 python-dotenv = "^0.19.2"
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 pyyaml-include = "^1.3"
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 [package.source]
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 url = "https://github.com/crypto-com/pystarport.git"
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 name = "pytest"
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 ]
 
 [[package]]
@@ -2153,4 +2180,4 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "f701da5d29ad9ec428e21c44fb751ef4fcdb07c406955da8fe98dd493667bdcc"
+content-hash = "616e02455de7ba3255af44480e45b94d134ff876ccd1bff4bffb202f38cb7757"
diff --git a/tests/integration_tests/pyproject.toml b/tests/integration_tests/pyproject.toml
index 0847329999..7451b8e381 100644
--- a/tests/integration_tests/pyproject.toml
+++ b/tests/integration_tests/pyproject.toml
@@ -14,13 +14,13 @@ flake8-black = "^0.3.2"
 flake8-isort = "^4.1.1"
 pep8-naming = "^0.11.1"
 protobuf = "^3.13.0"
-grpcio = "^1.33.2"
-PyYAML = "^5.3.1"
+grpcio = "^1.53.0"
+pyyaml = "^6.0.1"
 python-dateutil = "^2.8.1"
 web3 = "^6.0.0b6"
 eth-bloom = "^1.0.4"
 python-dotenv = "^0.19.2"
-pystarport = { git = "https://github.com/crypto-com/pystarport.git", branch = "main" }
+pystarport = { git = "https://github.com/crypto-com/pystarport.git", branch = "main", rev = "326bb3e8c4523458463496a524defad0fb7a655e" }
 websockets = "^10.3"
 toml = "^0.10.2"
 pysha3 = "^1.0.2"
diff --git a/tests/integration_tests/test_fee_history.py b/tests/integration_tests/test_fee_history.py
index a6fa0aa10e..8d6f5f93f4 100644
--- a/tests/integration_tests/test_fee_history.py
+++ b/tests/integration_tests/test_fee_history.py
@@ -1,3 +1,5 @@
+import hashlib
+import json
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from pathlib import Path
 
@@ -5,7 +7,13 @@
 from web3 import Web3
 
 from .network import setup_custom_ethermint
-from .utils import ADDRS, send_transaction, w3_wait_for_new_blocks
+from .utils import (
+    ADDRS,
+    approve_proposal,
+    eth_to_bech32,
+    send_transaction,
+    w3_wait_for_new_blocks,
+)
 
 
 @pytest.fixture(scope="module")
@@ -160,3 +168,61 @@ def test_percentiles(cluster):
         ]
         result = [future.result() for future in as_completed(tasks)]
         assert all(msg in res["error"]["message"] for res in result)
+
+
+def test_concurrent(custom_ethermint, tmp_path):
+    w3: Web3 = custom_ethermint.w3
+    tx = {"to": ADDRS["community"], "value": 10, "gasPrice": w3.eth.gas_price}
+    # send multi txs, overlap happens with query with 2nd tx's block number
+    send_transaction(w3, tx)
+    receipt1 = send_transaction(w3, tx)
+    b1 = receipt1.blockNumber
+    send_transaction(w3, tx)
+
+    call = w3.provider.make_request
+    field = "baseFeePerGas"
+
+    cli = custom_ethermint.cosmos_cli()
+    p = cli.get_params("feemarket")["params"]
+    new_multiplier = 2
+    new_denominator = 200000000
+    p["elasticity_multiplier"] = new_multiplier
+    p["base_fee_change_denominator"] = new_denominator
+
+    proposal = tmp_path / "proposal.json"
+    # governance module account as signer
+    data = hashlib.sha256("gov".encode()).digest()[:20]
+    signer = eth_to_bech32(data)
+    print("mm-signer", signer)
+    proposal_src = {
+        "messages": [
+            {
+                "@type": "/ethermint.feemarket.v1.MsgUpdateParams",
+                "authority": signer,
+                "params": p,
+            }
+        ],
+        "deposit": "2aphoton",
+        "title": "title",
+        "summary": "summary",
+    }
+    proposal.write_text(json.dumps(proposal_src))
+    rsp = cli.submit_gov_proposal(proposal, from_="community")
+    assert rsp["code"] == 0, rsp["raw_log"]
+    approve_proposal(custom_ethermint, rsp)
+    print("check params have been updated now")
+    p = cli.get_params("feemarket")["params"]
+    assert p["elasticity_multiplier"] == new_multiplier
+    assert p["base_fee_change_denominator"] == new_denominator
+
+    percentiles = []
+    method = "eth_feeHistory"
+    # big enough concurrent requests to trigger overwrite bug
+    total = 10
+    size = 2
+    params = [size, hex(b1), percentiles]
+    res = []
+    with ThreadPoolExecutor(total) as exec:
+        t = [exec.submit(call, method, params) for i in range(total)]
+        res = [future.result()["result"][field] for future in as_completed(t)]
+    assert all(sublist == res[0] for sublist in res), res
diff --git a/tests/integration_tests/utils.py b/tests/integration_tests/utils.py
index 5f9c3c9f2f..fc8e5f1878 100644
--- a/tests/integration_tests/utils.py
+++ b/tests/integration_tests/utils.py
@@ -264,3 +264,37 @@ def build_batch_tx(w3, cli, txs, key=KEYS["validator"]):
         },
         "signatures": [],
     }, tx_hashes
+
+
+def find_log_event_attrs(logs, ev_type, cond=None):
+    for ev in logs[0]["events"]:
+        if ev["type"] == ev_type:
+            attrs = {attr["key"]: attr["value"] for attr in ev["attributes"]}
+            if cond is None or cond(attrs):
+                return attrs
+    return None
+
+
+def approve_proposal(n, rsp, event_query_tx=True):
+    cli = n.cosmos_cli()
+    if event_query_tx:
+        rsp = cli.event_query_tx_for(rsp["txhash"])
+    # get proposal_id
+
+    def cb(attrs):
+        return "proposal_id" in attrs
+
+    ev = find_log_event_attrs(rsp["logs"], "submit_proposal", cb)
+    proposal_id = ev["proposal_id"]
+    for i in range(len(n.config["validators"])):
+        rsp = n.cosmos_cli(i).gov_vote("validator", proposal_id, "yes")
+        assert rsp["code"] == 0, rsp["raw_log"]
+    wait_for_new_blocks(cli, 1)
+    assert (
+        int(cli.query_tally(proposal_id)["yes_count"]) == cli.staking_pool()
+    ), "all validators should have voted yes"
+    print("wait for proposal to be activated")
+    proposal = cli.query_proposal(proposal_id)
+    wait_for_block_time(cli, isoparse(proposal["voting_end_time"]))
+    proposal = cli.query_proposal(proposal_id)
+    assert proposal["status"] == "PROPOSAL_STATUS_PASSED", proposal