diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 129cbca..006a18d 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -5,16 +5,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.21.x, 1.22.x]
+        go-version: [1.22.x, 1.23.x, 1.24.x]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
     - name: Install Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Run lints
       uses: golangci/golangci-lint-action@v6
       with:
diff --git a/.golangci.yml b/.golangci.yml
index 39fe61d..69ad57d 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,5 +1,5 @@
 run:
-  deadline: 10m
+  timeout: 10m
 
 issues:
   exclude-use-default: false
diff --git a/go.mod b/go.mod
index dd98e31..af77632 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module github.com/yuin/goldmark
 
-go 1.19
+go 1.21
diff --git a/parser/delimiter.go b/parser/delimiter.go
index d097e3f..93b32de 100644
--- a/parser/delimiter.go
+++ b/parser/delimiter.go
@@ -111,7 +111,7 @@ func NewDelimiter(canOpen, canClose bool, length int, char byte, processor Delim
 }
 
 // ScanDelimiter scans a delimiter by given DelimiterProcessor.
-func ScanDelimiter(line []byte, before rune, min int, processor DelimiterProcessor) *Delimiter {
+func ScanDelimiter(line []byte, before rune, minimum int, processor DelimiterProcessor) *Delimiter {
 	i := 0
 	c := line[i]
 	j := i
@@ -120,7 +120,7 @@ func ScanDelimiter(line []byte, before rune, min int, processor DelimiterProcess
 	}
 	for ; j < len(line) && c == line[j]; j++ {
 	}
-	if (j - i) >= min {
+	if (j - i) >= minimum {
 		after := rune(' ')
 		if j != len(line) {
 			after = util.ToRune(line, j)
diff --git a/util/util_unsafe_go120.go b/util/util_unsafe_go120.go
deleted file mode 100644
index d6be534..0000000
--- a/util/util_unsafe_go120.go
+++ /dev/null
@@ -1,24 +0,0 @@
-//go:build !appengine && !js && !go1.21
-// +build !appengine,!js,!go1.21
-
-package util
-
-import (
-	"reflect"
-	"unsafe"
-)
-
-// BytesToReadOnlyString returns a string converted from given bytes.
-func BytesToReadOnlyString(b []byte) string {
-	return *(*string)(unsafe.Pointer(&b))
-}
-
-// StringToReadOnlyBytes returns bytes converted from given string.
-func StringToReadOnlyBytes(s string) (bs []byte) {
-	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
-	bh := (*reflect.SliceHeader)(unsafe.Pointer(&bs))
-	bh.Data = sh.Data
-	bh.Cap = sh.Len
-	bh.Len = sh.Len
-	return
-}