diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 3b5064e..513ba69 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: ["1.25.x", "1.26.x"]
+        go: ["1.26.x"]
         os: [ubuntu-24.04, macos-26, windows-2025]
 
     steps:
diff --git a/.gitignore b/.gitignore
index fbba440..e5c265f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 
 bin/
 tmp/
+vendor/
diff --git a/go.mod b/go.mod
index ad3cbb1..d312157 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,8 @@
 module github.com/AlekSi/hardcache
 
-go 1.25.0
+go 1.26
 
-toolchain go1.26.3
+toolchain go1.26.5
 
 // https://go.dev/doc/godebug#go-120
 // https://pkg.go.dev/archive/tar#Reader.Next
@@ -14,15 +14,11 @@ godebug (
 
 require (
 	github.com/AlekSi/lazyerrors v0.6.0
-	github.com/alecthomas/kong v1.15.0
+	github.com/AlekSi/shoulda v0.0.0-20260812055123-b29ca4861702
+	github.com/alecthomas/kong v1.16.1
 	github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b
-	github.com/stretchr/testify v1.11.1
 	github.com/xhit/go-str2duration/v2 v2.1.0
-	golang.org/x/sys v0.44.0
+	golang.org/x/sys v0.47.0
 )
 
-require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
-)
+require github.com/sanity-io/litter v1.5.8 // indirect
diff --git a/go.sum b/go.sum
index 989d45e..2575716 100644
--- a/go.sum
+++ b/go.sum
@@ -1,35 +1,40 @@
 github.com/AlekSi/lazyerrors v0.6.0 h1:TX4iCP7N+YOuOmUl6Gv5OQ7brhPzPPrSsEAm+at+avk=
 github.com/AlekSi/lazyerrors v0.6.0/go.mod h1:TresBdOmCoC169IDo09YbrYUDXiqRwlLpInBeS1qD2g=
+github.com/AlekSi/shoulda v0.0.0-20260812055123-b29ca4861702 h1:fs2UyZ4iZc54wToDRKccJ0YrI92CcOSz6wEcX++gk/g=
+github.com/AlekSi/shoulda v0.0.0-20260812055123-b29ca4861702/go.mod h1:2BlJHePkF/aGLNg+T2Zqoa6AzrXFB11MQpFxq4TBK2g=
 github.com/alecthomas/assert/v2 v2.11.0 h1:2Q9r3ki8+JYXvGsDyBXwH3LcJ+WK5D0gc5E8vS6K3D0=
 github.com/alecthomas/assert/v2 v2.11.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
-github.com/alecthomas/kong v1.15.0 h1:BVJstKbpO73zKpmIu+m/aLRrNmWwxXPIGTNin9VmLVI=
-github.com/alecthomas/kong v1.15.0/go.mod h1:wrlbXem1CWqUV5Vbmss5ISYhsVPkBb1Yo7YKJghju2I=
+github.com/alecthomas/kong v1.16.1 h1:ixhCt93XkJ98kGposQ54+bl0IK6XwqB40AsMynU7Z8E=
+github.com/alecthomas/kong v1.16.1/go.mod h1:wrlbXem1CWqUV5Vbmss5ISYhsVPkBb1Yo7YKJghju2I=
 github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs=
 github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b h1:mimo19zliBX/vSQ6PWWSL9lK8qwHozUj03+zLoEB8O0=
 github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b/go.mod h1:fvzegU4vN3H1qMT+8wDmzjAcDONcgo2/SZ/TyfdUOFs=
+github.com/davecgh/go-spew v0.0.0-20161028175848-04cdfd42973b/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
 github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
+github.com/pmezard/go-difflib v0.0.0-20151028094244-d8ed2627bdf0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sanity-io/litter v1.5.8 h1:uM/2lKrWdGbRXDrIq08Lh9XtVYoeGtcQxk9rtQ7+rYg=
+github.com/sanity-io/litter v1.5.8/go.mod h1:9gzJgR2i4ZpjZHsKvUXIRQVk7P+yM3e+jAF7bU2UI5U=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
+github.com/stretchr/testify v0.0.0-20161117074351-18a02ba4a312/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
-github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/xhit/go-str2duration/v2 v2.1.0 h1:lxklc02Drh6ynqX+DdPyp5pCKLUQpRT8bp8Ydu2Bstc=
 github.com/xhit/go-str2duration/v2 v2.1.0/go.mod h1:ohY8p+0f07DiV6Em5LKB0s2YpLtXVyJfNt1+BlmyAsU=
-golang.org/x/sys v0.44.0 h1:ildZl3J4uzeKP07r2F++Op7E9B29JRUy+a27EibtBTQ=
-golang.org/x/sys v0.44.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/internal/caches/local/disk_test.go b/internal/caches/local/disk_test.go
index 4ea15ff..c95e128 100644
--- a/internal/caches/local/disk_test.go
+++ b/internal/caches/local/disk_test.go
@@ -4,21 +4,21 @@ import (
 	"os/exec"
 	"testing"
 
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
+	"github.com/AlekSi/shoulda"
+	"github.com/AlekSi/shoulda/musta"
 )
 
 func TestDiskInfo(t *testing.T) {
 	b, err := exec.Command("df", "-m", "/").CombinedOutput()
-	require.NoError(t, err)
+	musta.NoError(t, err)
 	t.Logf("\n%s", b)
 
 	total, free, err := DiskInfo("/")
-	require.NoError(t, err)
+	musta.NoError(t, err)
 
 	t.Logf("\n           total: %dM,    free: %dM", total/1024/1024, free/1024/1024)
 
-	assert.Positive(t, total)
-	assert.Positive(t, free)
-	assert.Greater(t, total, free)
+	shoulda.BeGreater(t, total, 0)
+	shoulda.BeGreater(t, free, 0)
+	shoulda.BeGreater(t, total, free)
 }
diff --git a/internal/caches/local/local_test.go b/internal/caches/local/local_test.go
index 071febf..29c5067 100644
--- a/internal/caches/local/local_test.go
+++ b/internal/caches/local/local_test.go
@@ -9,8 +9,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
+	"github.com/AlekSi/shoulda"
+	"github.com/AlekSi/shoulda/musta"
 
 	"github.com/AlekSi/hardcache/internal/go/cache"
 )
@@ -23,7 +23,7 @@ func setup(t testing.TB) string {
 	dst := t.TempDir()
 
 	b, err := exec.Command("cp", "-a", src, dst).CombinedOutput()
-	require.NoError(t, err, "%s", b)
+	musta.NoErrorf(t, err, "%s", b)
 
 	return filepath.Join(dst, "local")
 }
@@ -45,8 +45,8 @@ func fromHex(t testing.TB, s string) [cache.HashSize]byte {
 
 	var res [cache.HashSize]byte
 	n, err := hex.Decode(res[:], []byte(s))
-	require.NoError(t, err)
-	require.Equal(t, n, cache.HashSize)
+	musta.NoError(t, err)
+	musta.BeEqual(t, n, cache.HashSize)
 
 	return res
 }
@@ -68,15 +68,13 @@ func TestCache(t *testing.T) {
 
 	dir := setup(t)
 
-	c, err := cache.Open(dir)
-	require.NoError(t, err)
+	c := musta.NotFail(cache.Open(dir))(t)
 
 	t.Cleanup(func() {
-		require.NoError(t, c.Close())
+		musta.NoError(t, c.Close())
 	})
 
-	actual, err := c.Get(actionID(t, "01a8b978c9044aabe4e554ee2d630f5437162fd385e60fbaf51492b4be15c226"))
-	require.NoError(t, err)
+	actual := musta.NotFail(c.Get(actionID(t, "01a8b978c9044aabe4e554ee2d630f5437162fd385e60fbaf51492b4be15c226")))(t)
 
 	expected := cache.Entry{
 		OutputID: outputID(t, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"),
@@ -84,20 +82,18 @@ func TestCache(t *testing.T) {
 		Time:     time.Date(2025, time.November, 17, 17, 13, 1, 426224000, time.UTC).Local(),
 	}
 
-	assert.Equal(t, expected.Time, actual.Time)
-	assert.Equal(t, expected, actual)
+	shoulda.BeDeepEqual(t, actual.Time, expected.Time)
+	shoulda.BeDeepEqual(t, actual, expected)
 
-	actual, err = c.Get(actionID(t, "fd8792322c0942921f5dca60ae1196d10c2195bfadef68f80f94de000625531c"))
-	require.NoError(t, err)
+	actual = musta.NotFail(c.Get(actionID(t, "fd8792322c0942921f5dca60ae1196d10c2195bfadef68f80f94de000625531c")))(t)
 
 	expected.Time = time.Date(2025, time.November, 17, 17, 13, 2, 227666000, time.UTC).Local()
 
-	assert.Equal(t, expected.Time, actual.Time)
-	assert.Equal(t, expected, actual)
+	shoulda.BeDeepEqual(t, actual.Time, expected.Time)
+	shoulda.BeDeepEqual(t, actual, expected)
 
 	// executable
-	actual, err = c.Get(actionID(t, "b774285e0fffc3f1827be05e08ea22244e40ae09ca8359e45e329740aaa06dba"))
-	require.NoError(t, err)
+	actual = musta.NotFail(c.Get(actionID(t, "b774285e0fffc3f1827be05e08ea22244e40ae09ca8359e45e329740aaa06dba")))(t)
 
 	expected = cache.Entry{
 		OutputID: outputID(t, "4b949c7e306fe19cf063f3dc5c1ab963a09a6bea4f7545974fe7385bdbaace94"),
@@ -105,90 +101,84 @@ func TestCache(t *testing.T) {
 		Time:     time.Date(2025, time.November, 17, 17, 13, 7, 284280000, time.UTC).Local(),
 	}
 
-	assert.Equal(t, expected.Time, actual.Time)
-	assert.Equal(t, expected, actual)
+	shoulda.BeDeepEqual(t, actual.Time, expected.Time)
+	shoulda.BeDeepEqual(t, actual, expected)
 }
 
 func TestTrimNoop(t *testing.T) {
 	t.Parallel()
 
 	c, err := New(setup(t), nil, nil, logger(t))
-	require.NoError(t, err)
+	musta.NoError(t, err)
 
 	before, freed := c.TrimForce()
-	assert.EqualValues(t, -1, before)
-	assert.EqualValues(t, 0, freed)
+	shoulda.BeEqual(t, before, -1)
+	shoulda.BeEqual(t, freed, 0)
 }
 
 func TestTrimCutoffNone(t *testing.T) {
 	t.Parallel()
 
 	cutoff := time.Date(2000, time.January, 1, 0, 0, 0, 0, time.UTC)
-	c, err := New(setup(t), &cutoff, nil, logger(t))
-	require.NoError(t, err)
+	c := musta.NotFail(New(setup(t), &cutoff, nil, logger(t)))(t)
 
 	before, freed := c.TrimForce()
-	assert.EqualValues(t, 109_518_524, before)
-	assert.EqualValues(t, 0, freed)
+	shoulda.BeEqual(t, before, int64(109_518_524))
+	shoulda.BeEqual(t, freed, int64(0))
 }
 
 func TestTrimCutoffAll(t *testing.T) {
 	t.Parallel()
 
 	cutoff := time.Date(2999, time.January, 1, 0, 0, 0, 0, time.UTC)
-	c, err := New(setup(t), &cutoff, nil, logger(t))
-	require.NoError(t, err)
+	c := musta.NotFail(New(setup(t), &cutoff, nil, logger(t)))(t)
 
 	before, freed := c.TrimForce()
-	assert.EqualValues(t, 109_518_524, before)
-	assert.EqualValues(t, 109_518_524, freed)
+	shoulda.BeEqual(t, before, int64(109_518_524))
+	shoulda.BeEqual(t, freed, int64(109_518_524))
 }
 
 func TestTrimCutoffPart(t *testing.T) {
 	t.Parallel()
 
 	cutoff := time.Date(2025, time.November, 17, 17, 13, 0, 0, time.UTC)
-	c, err := New(setup(t), &cutoff, nil, logger(t))
-	require.NoError(t, err)
+	c := musta.NotFail(New(setup(t), &cutoff, nil, logger(t)))(t)
 
 	before, freed := c.TrimForce()
-	assert.EqualValues(t, 109_518_524, before)
-	assert.EqualValues(t, 3_975_344, freed)
+	shoulda.BeEqual(t, before, int64(109_518_524))
+	shoulda.BeEqual(t, freed, int64(3_975_344))
 }
 
 func TestTrimSizeNone(t *testing.T) {
 	t.Parallel()
 
 	maxSize := int64(math.MaxInt64)
-	c, err := New(setup(t), nil, &maxSize, logger(t))
-	require.NoError(t, err)
+	c := musta.NotFail(New(setup(t), nil, &maxSize, logger(t)))(t)
 
 	before, freed := c.TrimForce()
-	assert.EqualValues(t, 109_518_524, before)
-	assert.EqualValues(t, 0, freed)
+	shoulda.BeEqual(t, before, int64(109_518_524))
+	shoulda.BeEqual(t, freed, int64(0))
 }
 
 func TestTrimSizeAll(t *testing.T) {
 	t.Parallel()
 
 	maxSize := int64(0)
-	c, err := New(setup(t), nil, &maxSize, logger(t))
-	require.NoError(t, err)
+	c := musta.NotFail(New(setup(t), nil, &maxSize, logger(t)))(t)
 
 	before, freed := c.TrimForce()
-	assert.EqualValues(t, 109_518_524, before)
-	assert.EqualValues(t, 109_518_524, freed)
+	shoulda.BeEqual(t, before, int64(109_518_524))
+	shoulda.BeEqual(t, freed, int64(109_518_524))
 }
 
 func TestTrimSizePart(t *testing.T) {
 	t.Parallel()
 
 	maxSize := int64(50_000_000)
-	c, err := New(setup(t), nil, &maxSize, logger(t))
-	require.NoError(t, err)
+	c := musta.NotFail(New(setup(t), nil, &maxSize, logger(t)))(t)
 
 	before, freed := c.TrimForce()
-	assert.EqualValues(t, 109_518_524, before)
-	assert.EqualValues(t, 60_023_595, freed)
-	assert.Less(t, before-freed, maxSize)
+	shoulda.BeEqual(t, before, int64(109_518_524))
+	shoulda.BeEqual(t, freed, int64(60_023_595))
+	shoulda.BeLess(t, before-freed, maxSize)
 }
diff --git a/internal/testdata/go.mod b/internal/testdata/go.mod
index c7dfaf5..3ccc69b 100644
--- a/internal/testdata/go.mod
+++ b/internal/testdata/go.mod
@@ -2,6 +2,6 @@
 
 module github.com/AlekSi/hardcache/internal/testdata
 
-go 1.25
+go 1.26
 
 tool github.com/AlekSi/hardcache/internal/testdata/mytool