diff --git a/calc.go b/calc.go
index 5f991bafa2..0272c91b82 100644
--- a/calc.go
+++ b/calc.go
@@ -29,7 +29,6 @@ import (
 	"sync"
 	"time"
 	"unicode"
-	"unicode/utf16"
 	"unicode/utf8"
 	"unsafe"
 
@@ -14509,7 +14508,7 @@ func (fn *formulaFuncs) TEXTJOIN(argsList *list.List) formulaArg {
 		return ok
 	}
 	result := strings.Join(args, delimiter.Value())
-	if len(utf16.Encode([]rune(result))) > TotalCellChars {
+	if countUTF16String(result) > TotalCellChars {
 		return newErrorFormulaArg(formulaErrorVALUE, fmt.Sprintf("TEXTJOIN function exceeds %d characters", TotalCellChars))
 	}
 	return newStringFormulaArg(result)
diff --git a/cell.go b/cell.go
index baa5555fde..278d9f45a2 100644
--- a/cell.go
+++ b/cell.go
@@ -21,7 +21,6 @@ import (
 	"strconv"
 	"strings"
 	"time"
-	"unicode/utf16"
 
 	"github.com/xuri/efp"
 )
@@ -447,7 +446,7 @@ func (f *File) SetCellStr(sheet, cell, value string) error {
 
 // setCellString provides a function to set string type to shared string table.
 func (f *File) setCellString(value string) (t, v string, err error) {
-	if len(utf16.Encode([]rune(value))) > TotalCellChars {
+	if countUTF16String(value) > TotalCellChars {
 		value = truncateUTF16Units(value, TotalCellChars)
 	}
 	t = "s"
@@ -510,7 +509,7 @@ func (f *File) setSharedString(val string) (int, error) {
 
 // trimCellValue provides a function to set string type to cell.
 func trimCellValue(value string, escape bool) (v string, ns xml.Attr) {
-	if len(utf16.Encode([]rune(value))) > TotalCellChars {
+	if countUTF16String(value) > TotalCellChars {
 		value = truncateUTF16Units(value, TotalCellChars)
 	}
 	if value != "" {
@@ -1211,7 +1210,7 @@ func setRichText(runs []RichTextRun) ([]xlsxR, error) {
 		totalCellChars int
 	)
 	for _, textRun := range runs {
-		totalCellChars += len(utf16.Encode([]rune(textRun.Text)))
+		totalCellChars += countUTF16String(textRun.Text)
 		if totalCellChars > TotalCellChars {
 			return textRuns, ErrCellCharsLength
 		}
diff --git a/chart.go b/chart.go
index 3cc11182a1..bf232020f4 100644
--- a/chart.go
+++ b/chart.go
@@ -904,6 +904,9 @@ func (opts *Chart) parseTitle() {
 //	ShowPercent
 //	ShowSerName
 //	ShowVal
+//	Fill
+//	UpBars
+//	DownBars
 //	NumFmt
 //
 // SecondPlotValues: Specifies the values in second plot for the 'PieOfPie' and
@@ -935,6 +938,14 @@ func (opts *Chart) parseTitle() {
 // ShowVal: Specifies that the value shall be shown in a data label.
 // The 'ShowVal' property is optional. The default value is false.
 //
+// Fill: Set fill color of the chart.
+//
+// UpBars: Specifies the format for stock chart up bars. The 'UpBars' property
+// is optional.
+//
+// DownBars: Specifies the format for stock chart down bars. The 'DownBars'
+// property is optional.
+//
 // NumFmt: Specifies that if linked to source and set custom number format code
 // for data labels. The 'NumFmt' property is optional. The default format code
 // is 'General'.
diff --git a/datavalidation.go b/datavalidation.go
index 3b5a852dbc..68de62a785 100644
--- a/datavalidation.go
+++ b/datavalidation.go
@@ -18,7 +18,6 @@ import (
 	"math"
 	"slices"
 	"strings"
-	"unicode/utf16"
 )
 
 // DataValidationType defined the type of data validation.
@@ -150,7 +149,7 @@ func (dv *DataValidation) SetInput(title, msg string) {
 // for their cells.
 func (dv *DataValidation) SetDropList(keys []string) error {
 	formula := strings.Join(keys, ",")
-	if MaxFieldLength < len(utf16.Encode([]rune(formula))) {
+	if MaxFieldLength < countUTF16String(formula) {
 		return ErrDataValidationFormulaLength
 	}
 	dv.Type = dataValidationTypeMap[DataValidationTypeList]
diff --git a/go.mod b/go.mod
index 91868dcb3f..571f7680c6 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/xuri/excelize/v2
 
-go 1.23.0
+go 1.24.0
 
 require (
 	github.com/richardlehane/mscfb v1.0.4
@@ -8,10 +8,10 @@ require (
 	github.com/tiendc/go-deepcopy v1.6.1
 	github.com/xuri/efp v0.0.1
 	github.com/xuri/nfp v0.0.2-0.20250530014748-2ddeb826f9a9
-	golang.org/x/crypto v0.40.0
+	golang.org/x/crypto v0.42.0
 	golang.org/x/image v0.25.0
-	golang.org/x/net v0.42.0
-	golang.org/x/text v0.27.0
+	golang.org/x/net v0.44.0
+	golang.org/x/text v0.29.0
 )
 
 require (
diff --git a/go.sum b/go.sum
index 106b26cd6a..f141ca1839 100644
--- a/go.sum
+++ b/go.sum
@@ -15,14 +15,14 @@ github.com/xuri/efp v0.0.1 h1:fws5Rv3myXyYni8uwj2qKjVaRP30PdjeYe2Y6FDsCL8=
 github.com/xuri/efp v0.0.1/go.mod h1:ybY/Jr0T0GTCnYjKqmdwxyxn2BQf2RcQIIvex5QldPI=
 github.com/xuri/nfp v0.0.2-0.20250530014748-2ddeb826f9a9 h1:+C0TIdyyYmzadGaL/HBLbf3WdLgC29pgyhTjAT/0nuE=
 github.com/xuri/nfp v0.0.2-0.20250530014748-2ddeb826f9a9/go.mod h1:WwHg+CVyzlv/TX9xqBFXEZAuxOPxn2k1GNHwG41IIUQ=
-golang.org/x/crypto v0.40.0 h1:r4x+VvoG5Fm+eJcxMaY8CQM7Lb0l1lsmjGBQ6s8BfKM=
-golang.org/x/crypto v0.40.0/go.mod h1:Qr1vMER5WyS2dfPHAlsOj01wgLbsyWtFn/aY+5+ZdxY=
+golang.org/x/crypto v0.42.0 h1:chiH31gIWm57EkTXpwnqf8qeuMUi0yekh6mT2AvFlqI=
+golang.org/x/crypto v0.42.0/go.mod h1:4+rDnOTJhQCx2q7/j6rAN5XDw8kPjeaXEUR2eL94ix8=
 golang.org/x/image v0.25.0 h1:Y6uW6rH1y5y/LK1J8BPWZtr6yZ7hrsy6hFrXjgsc2fQ=
 golang.org/x/image v0.25.0/go.mod h1:tCAmOEGthTtkalusGp1g3xa2gke8J6c2N565dTyl9Rs=
-golang.org/x/net v0.42.0 h1:jzkYrhi3YQWD6MLBJcsklgQsoAcw89EcZbJw8Z614hs=
-golang.org/x/net v0.42.0/go.mod h1:FF1RA5d3u7nAYA4z2TkclSCKh68eSXtiFwcWQpPXdt8=
-golang.org/x/text v0.27.0 h1:4fGWRpyh641NLlecmyl4LOe6yDdfaYNrGb2zdfo4JV4=
-golang.org/x/text v0.27.0/go.mod h1:1D28KMCvyooCX9hBiosv5Tz/+YLxj0j7XhWjpSUF7CU=
+golang.org/x/net v0.44.0 h1:evd8IRDyfNBMBTTY5XRF1vaZlD+EmWx6x8PkhR04H/I=
+golang.org/x/net v0.44.0/go.mod h1:ECOoLqd5U3Lhyeyo/QDCEVQ4sNgYsqvCZ722XogGieY=
+golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
+golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/lib.go b/lib.go
index 73d37c74e7..e12965d0f1 100644
--- a/lib.go
+++ b/lib.go
@@ -941,6 +941,15 @@ func setPtrFieldsVal(fields []string, immutable, mutable reflect.Value) {
 	}
 }
 
+// countUTF16String returns the number of UTF-16 code units in a string.
+func countUTF16String(s string) int {
+	var cnt int
+	for _, r := range s {
+		cnt += utf16.RuneLen(r)
+	}
+	return cnt
+}
+
 // truncateUTF16Units truncates a string to a maximum number of UTF-16 code
 // units.
 func truncateUTF16Units(s string, length int) string {
diff --git a/lib_test.go b/lib_test.go
index 6d33b19de7..fe5eed0530 100644
--- a/lib_test.go
+++ b/lib_test.go
@@ -11,7 +11,6 @@ import (
 	"strings"
 	"sync"
 	"testing"
-	"unicode/utf16"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -357,7 +356,7 @@ func TestBstrMarshal(t *testing.T) {
 func TestTruncateUTF16Units(t *testing.T) {
 	assertTrunc := func(s string, max int, expected string) {
 		assert.Equal(t, expected, truncateUTF16Units(s, max), "src=%q max=%d", s, max)
-		assert.LessOrEqual(t, len(utf16.Encode([]rune(truncateUTF16Units(s, max)))), max)
+		assert.LessOrEqual(t, countUTF16String(truncateUTF16Units(s, max)), max)
 	}
 	// No truncation
 	assertTrunc("ABC", 3, "ABC")
diff --git a/sheet.go b/sheet.go
index c68bc5a032..1440ba58df 100644
--- a/sheet.go
+++ b/sheet.go
@@ -24,7 +24,6 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"unicode/utf16"
 
 	"github.com/tiendc/go-deepcopy"
 )
@@ -1341,7 +1340,7 @@ func (f *File) SetHeaderFooter(sheet string, opts *HeaderFooterOptions) error {
 	// Check 6 string type fields: OddHeader, OddFooter, EvenHeader, EvenFooter,
 	// FirstFooter, FirstHeader
 	for i := 4; i < v.NumField()-1; i++ {
-		if len(utf16.Encode([]rune(v.Field(i).String()))) > MaxFieldLength {
+		if countUTF16String(v.Field(i).String()) > MaxFieldLength {
 			return newFieldLengthError(v.Type().Field(i).Name)
 		}
 	}
@@ -1484,7 +1483,7 @@ func checkSheetName(name string) error {
 	if name == "" {
 		return ErrSheetNameBlank
 	}
-	if len(utf16.Encode([]rune(name))) > MaxSheetNameLength {
+	if countUTF16String(name) > MaxSheetNameLength {
 		return ErrSheetNameLength
 	}
 	if strings.HasPrefix(name, "'") || strings.HasSuffix(name, "'") {