diff --git a/CHANGELOG.md b/CHANGELOG.md
index 23576f9d06..81576ab9a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -55,6 +55,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (server/grpc) [\#516](https://github.com/line/lbm-sdk/pull/516) restore build norace flag
 * (genesis) [\#517](https://github.com/line/lbm-sdk/pull/517) fix genesis auth account format(cosmos-sdk style -> lbm-sdk style)
 * (x/foundation) [\#545](https://github.com/line/lbm-sdk/pull/545) fix genesis and support abstain
+* (x/auth) [\#563](https://github.com/line/lbm-sdk/pull/563) fix unmarshal bug of `BaseAccountJSON`
 
 ### Breaking Changes
 
diff --git a/x/auth/types/account.go b/x/auth/types/account.go
index 1c7a1eb550..5f520d4178 100644
--- a/x/auth/types/account.go
+++ b/x/auth/types/account.go
@@ -438,7 +438,7 @@ type PubKeyJSON struct {
 type BaseAccountJSON struct {
 	Address       string     `json:"address"`
 	PubKey        PubKeyJSON `json:"pub_key"`
-	AccountNumber uint64     `json:"account_number"`
+	AccountNumber uint64     `json:"account_number,string"`
 	Sequence      string     `json:"sequence"`
 }
 
diff --git a/x/auth/types/account_test.go b/x/auth/types/account_test.go
index 0a5b7179b7..1037621f44 100644
--- a/x/auth/types/account_test.go
+++ b/x/auth/types/account_test.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"strings"
 	"testing"
 
 	"github.com/gogo/protobuf/jsonpb"
@@ -237,6 +238,15 @@ func TestModuleAccountJSONPB(t *testing.T) {
 	require.Error(t, err)
 }
 
+func TestBaseAccountJSONPB(t *testing.T) {
+	baseAccountJson := `{"address":"link1rrfywnytlm87ywes0hvxn4rhm4grrn9qquqljc","pub_key":{"type":0,"key":null},"account_number":"10","sequence":"50"}`
+	ba := new(types.BaseAccount)
+	jum := jsonpb.Unmarshaler{}
+	err := jum.Unmarshal(strings.NewReader(baseAccountJson), ba)
+	require.NoError(t, err)
+	require.Equal(t, ba.AccountNumber, uint64(10))
+}
+
 func TestGenesisAccountsContains(t *testing.T) {
 	pubkey := secp256k1.GenPrivKey().PubKey()
 	addr := sdk.BytesToAccAddress(pubkey.Address())