klauspost · klauspost · Feb 24, 2026 · Feb 17, 2026 · Feb 17, 2026 · Feb 17, 2026
diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
@@ -12,7 +12,7 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: [1.23.x, 1.24.x, 1.25.x]
+        go-version: [1.24.x, 1.25.x, 1.26.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     env:
       CGO_ENABLED: 0
@@ -60,7 +60,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v6.2.0
       with:
-        go-version: 1.25.x
+        go-version: 1.26.x
 
     - name: Checkout code
       uses: actions/checkout@v6.0.2
@@ -82,7 +82,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v6.2.0
       with:
-        go-version: 1.25.x
+        go-version: 1.26.x
 
     - name: Checkout code
       uses: actions/checkout@v6.0.2
@@ -97,10 +97,10 @@ jobs:
       run: go build github.com/klauspost/compress/s2/cmd/s2c && go build github.com/klauspost/compress/s2/cmd/s2d&&./s2c -verify s2c &&./s2d s2c.s2&&rm ./s2c&&rm s2d&&rm s2c.s2
 
     - name: goreleaser deprecation
-      run: curl -sfL https://git.io/goreleaser | VERSION=v2.3.2 sh -s -- check
+      run: curl -sfL https://goreleaser.com/static/run | VERSION=v2.13.3 bash -s -- check
 
     - name: goreleaser snapshot
-      run: curl -sL https://git.io/goreleaser | VERSION=v2.3.2 sh -s -- --snapshot --clean
+      run: curl -sfL https://goreleaser.com/static/run | VERSION=v2.13.3 bash -s -- --snapshot --clean
 
     - name: Test S2 GOAMD64 v3
       env:
@@ -125,7 +125,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6.2.0
         with:
-          go-version: 1.25.x
+          go-version: 1.26.x
 
       - name: Checkout code
         uses: actions/checkout@v6.0.2

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
@@ -21,12 +21,12 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@a5f9b05d2d216f63e13859e0d847461041025775 # v5.2.0
         with:
-          go-version: 1.25.x
+          go-version: 1.26.x
       -
         name: Run GoReleaser
         uses: goreleaser/goreleaser-action@e435ccd777264be153ace6237001ef4d979d3a7a # v6.4.0
         with:
-          version: 2.11.2
+          version: 2.13.3
           args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

diff --git a/.goreleaser.yml b/.goreleaser.yml
@@ -31,6 +31,9 @@ builds:
       - mips64le
     goarm:
       - 7
+    ignore:
+      - goos: windows
+        goarch: arm
   -
     id: "s2d"
     binary: s2d
@@ -57,6 +60,9 @@ builds:
       - mips64le
     goarm:
       - 7
+    ignore:
+      - goos: windows
+        goarch: arm
   -
     id: "s2sx"
     binary: s2sx
@@ -84,14 +90,17 @@ builds:
       - mips64le
     goarm:
       - 7
+    ignore:
+      - goos: windows
+        goarch: arm
 
 archives:
   -
     id: s2-binaries
     name_template: "s2-{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
     format_overrides:
       - goos: windows
-        format: zip
+        formats: ['zip']
     files:
       - unpack/*
       - s2/LICENSE

diff --git a/flate/example_test.go b/flate/example_test.go
@@ -177,7 +177,7 @@ func Example_synchronization() {
 		}
 
 		b := make([]byte, 256)
-		for _, m := range strings.Fields("A long time ago in a galaxy far, far away...") {
+		for m := range strings.FieldsSeq("A long time ago in a galaxy far, far away...") {
 			// We use a simple framing format where the first byte is the
 			// message length, followed the message itself.
 			b[0] = uint8(copy(b[1:], m))

diff --git a/flate/regmask_other.go b/flate/regmask_other.go
@@ -1,5 +1,4 @@
 //go:build !amd64
-// +build !amd64
 
 package flate
 

diff --git a/flate/writer_test.go b/flate/writer_test.go
@@ -335,7 +335,6 @@ func TestWriter_Reset(t *testing.T) {
 	}
 	in := buf.Bytes()
 	for l := range 10 {
-		l := l
 		if testing.Short() && l > 1 {
 			continue
 		}

diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module github.com/klauspost/compress
 
-go 1.23
+go 1.24
 
 retract (
 	// https://github.com/klauspost/compress/issues/1114

diff --git a/gzhttp/asserts_test.go b/gzhttp/asserts_test.go
@@ -6,6 +6,7 @@ package gzhttp
 
 import (
 	"reflect"
+	"slices"
 	"testing"
 )
 
@@ -51,7 +52,7 @@ func isNil(object any) bool {
 		[]reflect.Kind{
 			reflect.Chan, reflect.Func,
 			reflect.Interface, reflect.Map,
-			reflect.Ptr, reflect.Slice},
+			reflect.Pointer, reflect.Slice},
 		kind)
 
 	if isNilableKind && value.IsNil() {
@@ -63,11 +64,5 @@ func isNil(object any) bool {
 
 // containsKind checks if a specified kind in the slice of kinds.
 func containsKind(kinds []reflect.Kind, kind reflect.Kind) bool {
-	for i := range kinds {
-		if kind == kinds[i] {
-			return true
-		}
-	}
-
-	return false
+	return slices.Contains(kinds, kind)
 }
diff --git a/gzip/gzip_test.go b/gzip/gzip_test.go
@@ -361,12 +361,12 @@ func testFileWindow(i, window int, t *testing.T) {
 }
 
 func testBigGzip(i int, t *testing.T) {
+	rng := rand.New(rand.NewSource(1337))
 	if len(testbuf) != i {
 		// Make results predictable
-		rand.Seed(1337)
 		testbuf = make([]byte, i)
 		for idx := range testbuf {
-			testbuf[idx] = byte(65 + rand.Intn(20))
+			testbuf[idx] = byte(65 + rng.Intn(20))
 		}
 	}
 	c := BestCompression
@@ -441,10 +441,10 @@ func testDeterm(level int, t *testing.T) {
 	if testing.Short() {
 		length = 100000
 	}
-	rand.Seed(1337)
+	rng := rand.New(rand.NewSource(1337))
 	t1 := make([]byte, length)
 	for idx := range t1 {
-		t1[idx] = byte(65 + rand.Intn(8))
+		t1[idx] = byte(65 + rng.Intn(8))
 	}
 
 	br := bytes.NewBuffer(t1)
@@ -462,10 +462,10 @@ func testDeterm(level int, t *testing.T) {
 
 	// We recreate the buffer, so we have a goos chance of getting a
 	// different memory address.
-	rand.Seed(1337)
+	rng = rand.New(rand.NewSource(1337))
 	t2 := make([]byte, length)
 	for idx := range t2 {
-		t2[idx] = byte(65 + rand.Intn(8))
+		t2[idx] = byte(65 + rng.Intn(8))
 	}
 
 	br2 := bytes.NewBuffer(t2)
@@ -538,46 +538,6 @@ func benchmarkGzipN(b *testing.B, level int) {
 	}
 }
 
-/*
-func BenchmarkOldGzipL1(b *testing.B) { benchmarkOldGzipN(b, 1) }
-func BenchmarkOldGzipL2(b *testing.B) { benchmarkOldGzipN(b, 2) }
-func BenchmarkOldGzipL3(b *testing.B) { benchmarkOldGzipN(b, 3) }
-func BenchmarkOldGzipL4(b *testing.B) { benchmarkOldGzipN(b, 4) }
-func BenchmarkOldGzipL5(b *testing.B) { benchmarkOldGzipN(b, 5) }
-func BenchmarkOldGzipL6(b *testing.B) { benchmarkOldGzipN(b, 6) }
-func BenchmarkOldGzipL7(b *testing.B) { benchmarkOldGzipN(b, 7) }
-func BenchmarkOldGzipL8(b *testing.B) { benchmarkOldGzipN(b, 8) }
-func BenchmarkOldGzipL9(b *testing.B) { benchmarkOldGzipN(b, 9) }
-
-func benchmarkOldGzipN(b *testing.B, level int) {
-	dat, _ := os.ReadFile("testdata/test.json")
-	dat = append(dat, dat...)
-	dat = append(dat, dat...)
-	dat = append(dat, dat...)
-	dat = append(dat, dat...)
-	dat = append(dat, dat...)
-
-	b.SetBytes(int64(len(dat)))
-	w, _ := oldgz.NewWriterLevel(io.Discard, level)
-	b.ResetTimer()
-	for n := 0; n < b.N; n++ {
-		w.Reset(io.Discard)
-		n, err := w.Write(dat)
-		if n != len(dat) {
-			panic("short write")
-		}
-		if err != nil {
-			panic(err)
-		}
-		err = w.Close()
-		if err != nil {
-			panic(err)
-		}
-	}
-}
-
-*/
-
 func BenchmarkCompressAllocations(b *testing.B) {
 	payload := []byte(strings.Repeat("Tiny payload", 20))
 	for j := -2; j <= 9; j++ {

diff --git a/huff0/_generate/go.mod b/huff0/_generate/go.mod
@@ -1,6 +1,6 @@
 module github.com/klauspost/compress/huff0/_generate
 
-go 1.23
+go 1.24
 
 toolchain go1.24.2
 

diff --git a/huff0/decompress_amd64.go b/huff0/decompress_amd64.go
@@ -1,5 +1,4 @@
 //go:build amd64 && !appengine && !noasm && gc
-// +build amd64,!appengine,!noasm,gc
 
 // This file contains the specialisation of Decoder.Decompress4X
 // and Decoder.Decompress1X that use an asm implementation of thir main loops.

diff --git a/huff0/decompress_generic.go b/huff0/decompress_generic.go
@@ -1,5 +1,4 @@
 //go:build !amd64 || appengine || !gc || noasm
-// +build !amd64 appengine !gc noasm
 
 // This file contains a generic implementation of Decoder.Decompress4X.
 package huff0

diff --git a/internal/cpuinfo/cpuinfo_amd64.go b/internal/cpuinfo/cpuinfo_amd64.go
@@ -1,5 +1,4 @@
 //go:build amd64 && !appengine && !noasm && gc
-// +build amd64,!appengine,!noasm,gc
 
 package cpuinfo
 

diff --git a/s2/cmd/_s2sx/go.mod b/s2/cmd/_s2sx/go.mod
@@ -1,8 +1,6 @@
 module github.com/klauspost/compress/s2/cmd/_s2sx
 
-go 1.23
-
-toolchain go1.24.2
+go 1.24
 
 require github.com/klauspost/compress v1.11.9
 

diff --git a/s2/cmd/s2d/main.go b/s2/cmd/s2d/main.go
@@ -197,8 +197,8 @@ Options:`)
 	for _, filename := range files {
 		dstFilename := cleanFileName(filename)
 		block := *block
-		if strings.HasSuffix(dstFilename, ".block") {
-			dstFilename = strings.TrimSuffix(dstFilename, ".block")
+		if before, ok := strings.CutSuffix(dstFilename, ".block"); ok {
+			dstFilename = before
 			block = true
 		}
 		switch {

diff --git a/s2/decode_other.go b/s2/decode_other.go
@@ -4,7 +4,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build (!amd64 && !arm64) || appengine || !gc || noasm
-// +build !amd64,!arm64 appengine !gc noasm
 
 package s2
 

diff --git a/s2/encode_amd64.go b/s2/encode_amd64.go
@@ -1,5 +1,4 @@
 //go:build !appengine && !noasm && gc
-// +build !appengine,!noasm,gc
 
 package s2
 

diff --git a/s2/encode_go.go b/s2/encode_go.go
@@ -1,5 +1,4 @@
 //go:build !amd64 || appengine || !gc || noasm
-// +build !amd64 appengine !gc noasm
 
 package s2
 

diff --git a/s2/fuzz_test.go b/s2/fuzz_test.go
@@ -1,5 +1,4 @@
 //go:build go1.18
-// +build go1.18
 
 package s2
 

diff --git a/zip/internal/obscuretestdata/obscuretestdata.go b/zip/internal/obscuretestdata/obscuretestdata.go
@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build go1.16
-// +build go1.16
 
 // Package obscuretestdata contains functionality used by tests to more easily
 // work with testdata that must be obscured primarily due to

diff --git a/zstd/_generate/go.mod b/zstd/_generate/go.mod
@@ -1,6 +1,6 @@
 module github.com/klauspost/compress/zstd/_generate
 
-go 1.23
+go 1.24
 
 toolchain go1.24.2
 

diff --git a/zstd/fse_decoder_amd64.go b/zstd/fse_decoder_amd64.go
@@ -1,5 +1,4 @@
 //go:build amd64 && !appengine && !noasm && gc
-// +build amd64,!appengine,!noasm,gc
 
 package zstd
 

diff --git a/zstd/fse_decoder_generic.go b/zstd/fse_decoder_generic.go
@@ -1,5 +1,4 @@
 //go:build !amd64 || appengine || !gc || noasm
-// +build !amd64 appengine !gc noasm
 
 package zstd
 

diff --git a/zstd/fuzz_test.go b/zstd/fuzz_test.go
@@ -1,5 +1,4 @@
 //go:build go1.18
-// +build go1.18
 
 package zstd
 

diff --git a/zstd/internal/xxhash/xxhash_other.go b/zstd/internal/xxhash/xxhash_other.go
@@ -1,5 +1,4 @@
 //go:build (!amd64 && !arm64) || appengine || !gc || purego || noasm
-// +build !amd64,!arm64 appengine !gc purego noasm
 
 package xxhash
 

diff --git a/zstd/matchlen_amd64.go b/zstd/matchlen_amd64.go
@@ -1,5 +1,4 @@
 //go:build amd64 && !appengine && !noasm && gc
-// +build amd64,!appengine,!noasm,gc
 
 // Copyright 2019+ Klaus Post. All rights reserved.
 // License information can be found in the LICENSE file.

diff --git a/zstd/matchlen_generic.go b/zstd/matchlen_generic.go
@@ -1,5 +1,4 @@
 //go:build !amd64 || appengine || !gc || noasm
-// +build !amd64 appengine !gc noasm
 
 // Copyright 2019+ Klaus Post. All rights reserved.
 // License information can be found in the LICENSE file.

diff --git a/zstd/race_enabled_test.go b/zstd/race_enabled_test.go
@@ -2,7 +2,6 @@
 // License information can be found in the LICENSE file.
 
 //go:build race
-// +build race
 
 package zstd
 

diff --git a/zstd/seqdec_amd64.go b/zstd/seqdec_amd64.go
@@ -1,5 +1,4 @@
 //go:build amd64 && !appengine && !noasm && gc
-// +build amd64,!appengine,!noasm,gc
 
 package zstd
 

diff --git a/zstd/seqdec_amd64_test.go b/zstd/seqdec_amd64_test.go
@@ -1,5 +1,4 @@
 //go:build amd64 && !appengine && !noasm && gc
-// +build amd64,!appengine,!noasm,gc
 
 package zstd