diff --git a/CHANGELOG.md b/CHANGELOG.md
index 01787997..812f4c91 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Improvements
 
 ### Bug Fixes
+* (global) [\#103](https://github.com/line/lbm/pull/103) replace deprecated functions of ioutil package
 
 ### Improvements
 
diff --git a/cli_test/cli_test.go b/cli_test/cli_test.go
index 2b8bc29f..0cc93025 100644
--- a/cli_test/cli_test.go
+++ b/cli_test/cli_test.go
@@ -7,7 +7,6 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -1113,7 +1112,7 @@ func TestLBMCollectGentxs(t *testing.T) {
 	f := NewFixtures(t, getHomeDir(t))
 
 	// Initialize temporary directories
-	gentxDir, err := ioutil.TempDir("", "")
+	gentxDir, err := os.MkdirTemp("", "")
 	gentxDoc := filepath.Join(gentxDir, "gentx.json")
 	require.NoError(t, err)
 
@@ -1278,7 +1277,7 @@ func TestLBMWasmContract(t *testing.T) {
 		require.Len(t, queryCodesResponse.CodeInfos, 1)
 
 		// validate the hash is the same
-		expectedRow, err := ioutil.ReadFile(hashFile)
+		expectedRow, err := os.ReadFile(hashFile)
 		require.NoError(t, err)
 		expected, err := hex.DecodeString(string(expectedRow[:64]))
 		require.NoError(t, err)
diff --git a/cli_test/test_helpers.go b/cli_test/test_helpers.go
index 3f6ac1a5..19f7a8bd 100644
--- a/cli_test/test_helpers.go
+++ b/cli_test/test_helpers.go
@@ -5,7 +5,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
@@ -177,7 +176,7 @@ func getHomeDir(t *testing.T) string {
 	tmpDir := path.Join(os.ExpandEnv("$HOME"), ".lbmtest")
 	err := os.MkdirAll(tmpDir, os.ModePerm)
 	require.NoError(t, err)
-	tmpDir, err = ioutil.TempDir(tmpDir, "link_integration_"+strings.Split(t.Name(), "/")[0]+"_")
+	tmpDir, err = os.MkdirTemp(tmpDir, "link_integration_"+strings.Split(t.Name(), "/")[0]+"_")
 	require.NoError(t, err)
 	return tmpDir
 }
@@ -1147,7 +1146,7 @@ func (fg *FixtureGroup) initNodes(numberOfNodes int) {
 	t := fg.T
 
 	// Initialize temporary directories
-	gentxDir, err := ioutil.TempDir("", "")
+	gentxDir, err := os.MkdirTemp("", "")
 	require.NoError(t, err)
 	defer func() {
 		require.NoError(t, os.RemoveAll(gentxDir))
@@ -1179,13 +1178,13 @@ func (fg *FixtureGroup) initNodes(numberOfNodes int) {
 		f.CollectGenTxs(fmt.Sprintf("--gentx-dir=%s", gentxDir))
 		f.ValidateGenesis(filepath.Join(f.Home, "config", "genesis.json"))
 		if len(fg.genesisFileContent) == 0 {
-			fg.genesisFileContent, err = ioutil.ReadFile(f.GenesisFile())
+			fg.genesisFileContent, err = os.ReadFile(f.GenesisFile())
 			require.NoError(t, err)
 		}
 	}
 
 	for _, f := range fg.fixturesMap {
-		err := ioutil.WriteFile(f.GenesisFile(), fg.genesisFileContent, os.ModePerm)
+		err := os.WriteFile(f.GenesisFile(), fg.genesisFileContent, os.ModePerm)
 		require.NoError(t, err)
 	}
 }
@@ -1212,7 +1211,7 @@ func (fg *FixtureGroup) AddFullNode(flags ...string) *Fixtures {
 	chainID := fg.T.Name()
 
 	name := fmt.Sprintf("%s-%s%d", t.Name(), namePrefix, idx)
-	tmpDir, err := ioutil.TempDir("", "")
+	tmpDir, err := os.MkdirTemp("", "")
 	require.NoError(t, err)
 
 	appCfg := srvconfig.DefaultConfig()
@@ -1231,7 +1230,7 @@ func (fg *FixtureGroup) AddFullNode(flags ...string) *Fixtures {
 		if len(fg.genesisFileContent) == 0 {
 			panic("genesis file is not loaded")
 		}
-		err := ioutil.WriteFile(f.GenesisFile(), fg.genesisFileContent, os.ModePerm)
+		err := os.WriteFile(f.GenesisFile(), fg.genesisFileContent, os.ModePerm)
 		require.NoError(t, err)
 	}
 
@@ -1336,7 +1335,7 @@ func addFlags(args string, flags ...string) []string {
 
 // Write the given string to a new temporary file
 func WriteToNewTempFile(t *testing.T, s string) *os.File {
-	fp, err := ioutil.TempFile(os.TempDir(), "cosmos_cli_test_")
+	fp, err := os.CreateTemp(os.TempDir(), "cosmos_cli_test_")
 	require.Nil(t, err)
 	_, err = fp.WriteString(s)
 	require.Nil(t, err)