diff --git a/.github/workflows/gin.yml b/.github/workflows/gin.yml
index 2e43434..4a9dbc9 100644
--- a/.github/workflows/gin.yml
+++ b/.github/workflows/gin.yml
@@ -34,7 +34,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        go: ["1.18", "1.19", "1.20", "1.21", "1.22"]
+        go: ["1.20", "1.21", "1.22"]
         test-tags:
           ["", "-tags nomsgpack", '-tags "sonic avx"', "-tags go_json", "-race"]
         include:
diff --git a/context_1.18_test.go b/context_1.18_test.go
deleted file mode 100644
index 6118bea..0000000
--- a/context_1.18_test.go
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright 2021 Gin Core Team. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.19
-
-package gin
-
-import (
-	"bytes"
-	"mime/multipart"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestContextFormFileFailed18(t *testing.T) {
-	buf := new(bytes.Buffer)
-	mw := multipart.NewWriter(buf)
-	defer func(mw *multipart.Writer) {
-		err := mw.Close()
-		if err != nil {
-			assert.Error(t, err)
-		}
-	}(mw)
-	c, _ := CreateTestContext(httptest.NewRecorder())
-	c.Request, _ = http.NewRequest("POST", "/", nil)
-	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
-	c.engine.MaxMultipartMemory = 8 << 20
-	assert.Panics(t, func() {
-		f, err := c.FormFile("file")
-		assert.Error(t, err)
-		assert.Nil(t, f)
-	})
-}
diff --git a/context_1.19_test.go b/context_1.19_test.go
deleted file mode 100644
index dd75325..0000000
--- a/context_1.19_test.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2022 Gin Core Team. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build go1.19
-
-package gin
-
-import (
-	"bytes"
-	"mime/multipart"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestContextFormFileFailed19(t *testing.T) {
-	buf := new(bytes.Buffer)
-	mw := multipart.NewWriter(buf)
-	mw.Close()
-	c, _ := CreateTestContext(httptest.NewRecorder())
-	c.Request, _ = http.NewRequest("POST", "/", nil)
-	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
-	c.engine.MaxMultipartMemory = 8 << 20
-	f, err := c.FormFile("file")
-	assert.Error(t, err)
-	assert.Nil(t, f)
-}
diff --git a/context_test.go b/context_test.go
index e9bbae5..ae34c65 100644
--- a/context_test.go
+++ b/context_test.go
@@ -90,6 +90,19 @@ func TestContextFormFile(t *testing.T) {
 	assert.NoError(t, c.SaveUploadedFile(f, "test"))
 }
 
+func TestContextFormFileFailed(t *testing.T) {
+	buf := new(bytes.Buffer)
+	mw := multipart.NewWriter(buf)
+	mw.Close()
+	c, _ := CreateTestContext(httptest.NewRecorder())
+	c.Request, _ = http.NewRequest("POST", "/", nil)
+	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
+	c.engine.MaxMultipartMemory = 8 << 20
+	f, err := c.FormFile("file")
+	assert.Error(t, err)
+	assert.Nil(t, f)
+}
+
 func TestContextMultipartForm(t *testing.T) {
 	buf := new(bytes.Buffer)
 	mw := multipart.NewWriter(buf)
diff --git a/debug.go b/debug.go
index 0d808f1..ae346e9 100644
--- a/debug.go
+++ b/debug.go
@@ -78,7 +78,7 @@ func getMinVer(v string) (uint64, error) {
 
 func debugPrintWARNINGDefault() {
 	if v, e := getMinVer(runtime.Version()); e == nil && v < ginSupportMinGoVer {
-		debugPrint(`[WARNING] Now Gin requires Go 1.18+.
+		debugPrint(`[WARNING] Now Gin requires Go 1.20+.
 
 `)
 	}
diff --git a/debug_test.go b/debug_test.go
index 2d5e9a5..e390972 100644
--- a/debug_test.go
+++ b/debug_test.go
@@ -104,7 +104,7 @@ func TestDebugPrintWARNINGDefault(t *testing.T) {
 	})
 	m, e := getMinVer(runtime.Version())
 	if e == nil && m < ginSupportMinGoVer {
-		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.18+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
+		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.20+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	} else {
 		assert.Equal(t, "[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	}
diff --git a/internal/bytesconv/bytesconv_1.20.go b/internal/bytesconv/bytesconv.go
similarity index 97%
rename from internal/bytesconv/bytesconv_1.20.go
rename to internal/bytesconv/bytesconv.go
index 5b6040a..a02c53c 100644
--- a/internal/bytesconv/bytesconv_1.20.go
+++ b/internal/bytesconv/bytesconv.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.
 
-//go:build go1.20
-
 package bytesconv
 
 import (
diff --git a/internal/bytesconv/bytesconv_1.19.go b/internal/bytesconv/bytesconv_1.19.go
deleted file mode 100644
index 669c9c9..0000000
--- a/internal/bytesconv/bytesconv_1.19.go
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2020 Gin Core Team. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.20
-
-package bytesconv
-
-import (
-	"unsafe"
-)
-
-// StringToBytes converts string to byte slice without a memory allocation.
-func StringToBytes(s string) []byte {
-	return *(*[]byte)(unsafe.Pointer(
-		&struct {
-			string
-			Cap int
-		}{s, len(s)},
-	))
-}
-
-// BytesToString converts byte slice to string without a memory allocation.
-func BytesToString(b []byte) string {
-	return *(*string)(unsafe.Pointer(&b))
-}