diff --git a/go.mod b/go.mod
index e695ebb1..490b0a4c 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/openinfradev/tks-api
 
-go 1.20
+go 1.19
 
 require (
 	github.com/Nerzal/gocloak/v13 v13.1.0
diff --git a/internal/route/route.go b/internal/route/route.go
index 4459a877..7edbd419 100644
--- a/internal/route/route.go
+++ b/internal/route/route.go
@@ -5,7 +5,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"time"
 
@@ -216,7 +215,7 @@ func loggingMiddleware(next http.Handler) http.Handler {
 		if err == nil {
 			log.InfoWithContext(r.Context(), fmt.Sprintf("REQUEST BODY : %s", bytes.NewBuffer(body).String()))
 		}
-		r.Body = ioutil.NopCloser(bytes.NewBuffer(body))
+		r.Body = io.NopCloser(bytes.NewBuffer(body))
 
 		next.ServeHTTP(w, r)
 
diff --git a/pkg/api-client/api-client.go b/pkg/api-client/api-client.go
index 6e6c4260..47f1ef05 100644
--- a/pkg/api-client/api-client.go
+++ b/pkg/api-client/api-client.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"time"
 
@@ -72,7 +72,7 @@ func (c *ApiClientImpl) Get(path string) (out interface{}, err error) {
 		return nil, fmt.Errorf("Failed to call api server.")
 	}
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return nil, err
 	}
@@ -132,7 +132,7 @@ func (c *ApiClientImpl) callWithBody(prefix string, method string, path string,
 		return nil, fmt.Errorf("Failed to call api server.")
 	}
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return nil, err
 	}
diff --git a/pkg/argo-client/client.go b/pkg/argo-client/client.go
index 4fafcd49..b100b5a4 100644
--- a/pkg/argo-client/client.go
+++ b/pkg/argo-client/client.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"time"
 
@@ -64,7 +64,7 @@ func (c *ArgoClientImpl) GetWorkflowTemplates(namespace string) (*GetWorkflowTem
 		}
 	}()
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return nil, err
 	}
@@ -95,7 +95,7 @@ func (c *ArgoClientImpl) GetWorkflow(namespace string, workflowName string) (*Wo
 		}
 	}()
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return nil, err
 	}
@@ -128,7 +128,7 @@ func (c *ArgoClientImpl) GetWorkflowLog(namespace string, container string, work
 		}
 	}()
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return logs, err
 	}
@@ -154,7 +154,7 @@ func (c *ArgoClientImpl) GetWorkflows(namespace string) (*GetWorkflowsResponse,
 		}
 	}()
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return nil, err
 	}
@@ -204,7 +204,7 @@ func (c *ArgoClientImpl) SumbitWorkflowFromWftpl(wftplName string, opts SubmitOp
 		}
 	}()
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return "", err
 	}
diff --git a/pkg/log/log.go b/pkg/log/log.go
index 039bd547..5ad235dd 100644
--- a/pkg/log/log.go
+++ b/pkg/log/log.go
@@ -2,7 +2,7 @@ package log
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"os"
 	"strings"
 
@@ -109,5 +109,5 @@ func Fatalf(format string, v ...interface{}) {
 }
 
 func Disable() {
-	logger.Out = ioutil.Discard
+	logger.Out = io.Discard
 }
diff --git a/pkg/thanos-client/client.go b/pkg/thanos-client/client.go
index 1cdf034c..61a602b7 100644
--- a/pkg/thanos-client/client.go
+++ b/pkg/thanos-client/client.go
@@ -3,7 +3,7 @@ package thanos
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"time"
@@ -63,7 +63,7 @@ func (c *ThanosClientImpl) Get(query string) (out Metric, err error) {
 		}
 	}()
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return out, err
 	}
@@ -100,7 +100,7 @@ func (c *ThanosClientImpl) FetchRange(query string, start int, end int, step int
 		}
 	}()
 
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return out, err
 	}