diff --git a/files/append_test.go b/files/append_test.go
index 1d6d16f..4fe2d76 100644
--- a/files/append_test.go
+++ b/files/append_test.go
@@ -8,32 +8,42 @@ import (
 
 	"codeberg.org/danjones000/my-log/config"
 	"codeberg.org/danjones000/my-log/models"
-	"github.com/stretchr/testify/suite"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
-func TestAppend(t *testing.T) {
-	suite.Run(t, new(AppendTestSuite))
+func TestAppend(tt *testing.T) {
+	tt.Run("success", func(t *testing.T) {
+		t.Run("single", appendTestSingle)
+		t.Run("two", appendTestTwoEntries)
+		t.Run("new_line", appendTestAddNewLine)
+		t.Run("no-new-line", appendTestDontAddNewLine)
+		t.Run("dot-folder", appendTestDotFolder)
+		t.Run("no-dot-folder", appendTestDotFolderNo)
+		t.Run("no-ext", appendTestNoExt)
+	})
+	tt.Run("failure", func(t *testing.T) {
+		t.Run("badEntry", appendTestBadEntry)
+		t.Run("load-err", appendTestConfLoadErr)
+		t.Run("mkdir-err", appendTestMkdirErr)
+		t.Run("append-log-err", appendTestOpenErr)
+	})
 }
 
-type AppendTestSuite struct {
-	suite.Suite
-	dir string
-}
-
-func (s *AppendTestSuite) SetupSuite() {
-	s.dir, _ = os.MkdirTemp("", "append-test")
-	config.Overrides["input.path"] = s.dir
+func setupAppendTest(t *testing.T) string {
+	t.Helper()
+	dir := t.ArtifactDir()
+	config.Overrides["input.path"] = dir
 	config.Overrides["input.ext"] = "log"
+	t.Cleanup(func() {
+		delete(config.Overrides, "input.path")
+		delete(config.Overrides, "input.ext")
+	})
+	return dir
 }
 
-func (s *AppendTestSuite) TearDownSuite() {
-	os.RemoveAll(s.dir)
-	delete(config.Overrides, "input.path")
-	delete(config.Overrides, "input.ext")
-}
-
-func (s *AppendTestSuite) TestSuccess() {
-	defer os.Remove(s.dir + "/test.log")
+func appendTestSingle(t *testing.T) {
+	dir := setupAppendTest(t)
 	when := time.Now().Local()
 	e := models.Entry{
 		Title: "Jimmy",
@@ -48,18 +58,18 @@ func (s *AppendTestSuite) TestSuccess() {
 		Entries: []models.Entry{e},
 	}
 	err := Append(l)
-	s.Require().NoError(err)
-	s.Require().FileExists(s.dir + "/test.log")
-	by, err := os.ReadFile(s.dir + "/test.log")
+	require.NoError(t, err)
+	require.FileExists(t, dir+"/test.log")
+	by, err := os.ReadFile(dir + "/test.log")
 	st := string(by)
-	s.Require().NoError(err)
-	s.Assert().Contains(st, "Jimmy\n")
-	s.Assert().Contains(st, "\n@foo 42")
-	s.Assert().Contains(st, "\n@bar true")
+	require.NoError(t, err)
+	assert.Contains(t, st, "Jimmy\n")
+	assert.Contains(t, st, "\n@foo 42")
+	assert.Contains(t, st, "\n@bar true")
 }
 
-func (s *AppendTestSuite) TestTwoEntries() {
-	defer os.Remove(s.dir + "/test.log")
+func appendTestTwoEntries(t *testing.T) {
+	dir := setupAppendTest(t)
 	when := time.Now().Local()
 	whens := when.Format(models.DateFormat)
 	e := []models.Entry{
@@ -71,17 +81,17 @@ func (s *AppendTestSuite) TestTwoEntries() {
 		Entries: e,
 	}
 	err := Append(l)
-	s.Assert().NoError(err)
-	s.Require().FileExists(s.dir + "/test.log")
-	by, _ := os.ReadFile(s.dir + "/test.log")
+	assert.NoError(t, err)
+	require.FileExists(t, dir+"/test.log")
+	by, _ := os.ReadFile(dir + "/test.log")
 	st := string(by)
-	s.Assert().Contains(st, fmt.Sprintf("@begin %s - one", whens))
-	s.Assert().Contains(st, fmt.Sprintf("@begin %s - two", whens))
+	assert.Contains(t, st, fmt.Sprintf("@begin %s - one", whens))
+	assert.Contains(t, st, fmt.Sprintf("@begin %s - two", whens))
 }
 
-func (s *AppendTestSuite) TestAddNewLine() {
-	defer os.Remove(s.dir + "/test.log")
-	os.WriteFile(s.dir+"/test.log", []byte("foo"), 0644)
+func appendTestAddNewLine(t *testing.T) {
+	dir := setupAppendTest(t)
+	os.WriteFile(dir+"/test.log", []byte("foo"), 0644)
 	when := time.Now().Local()
 	whens := when.Format(models.DateFormat)
 	e := []models.Entry{
@@ -92,16 +102,16 @@ func (s *AppendTestSuite) TestAddNewLine() {
 		Entries: e,
 	}
 	err := Append(l)
-	s.Assert().NoError(err)
-	s.Require().FileExists(s.dir + "/test.log")
-	by, _ := os.ReadFile(s.dir + "/test.log")
+	assert.NoError(t, err)
+	require.FileExists(t, dir+"/test.log")
+	by, _ := os.ReadFile(dir + "/test.log")
 	exp := fmt.Sprintf("foo\n@begin %s - one\n@id jimmy @end\n", whens)
-	s.Assert().Equal(exp, string(by))
+	assert.Equal(t, exp, string(by))
 }
 
-func (s *AppendTestSuite) TestDontAddNewLine() {
-	defer os.Remove(s.dir + "/test.log")
-	os.WriteFile(s.dir+"/test.log", []byte("foo\n"), 0644)
+func appendTestDontAddNewLine(t *testing.T) {
+	dir := setupAppendTest(t)
+	os.WriteFile(dir+"/test.log", []byte("foo\n"), 0644)
 	when := time.Now().Local()
 	whens := when.Format(models.DateFormat)
 	e := []models.Entry{
@@ -112,15 +122,15 @@ func (s *AppendTestSuite) TestDontAddNewLine() {
 		Entries: e,
 	}
 	err := Append(l)
-	s.Assert().NoError(err)
-	s.Require().FileExists(s.dir + "/test.log")
-	by, _ := os.ReadFile(s.dir + "/test.log")
+	assert.NoError(t, err)
+	require.FileExists(t, dir+"/test.log")
+	by, _ := os.ReadFile(dir + "/test.log")
 	exp := fmt.Sprintf("foo\n@begin %s - one\n@id jimmy @end\n", whens)
-	s.Assert().Equal(exp, string(by))
+	assert.Equal(t, exp, string(by))
 }
 
-func (s *AppendTestSuite) TestFailEntry() {
-	defer os.Remove(s.dir + "/test.log")
+func appendTestBadEntry(t *testing.T) {
+	dir := setupAppendTest(t)
 	e := models.Entry{
 		Title: "Jimmy",
 	}
@@ -129,14 +139,19 @@ func (s *AppendTestSuite) TestFailEntry() {
 		Entries: []models.Entry{e},
 	}
 	err := Append(l)
-	s.Assert().NoError(err)
-	s.Require().FileExists(s.dir + "/test.log")
-	by, _ := os.ReadFile(s.dir + "/test.log")
-	s.Assert().Equal([]byte{}, by)
+	assert.NoError(t, err)
+	require.FileExists(t, dir+"/test.log")
+	by, _ := os.ReadFile(dir + "/test.log")
+	assert.Equal(t, []byte{}, by)
 }
 
-func (s *AppendTestSuite) TestDotFolder() {
+func appendTestDotFolder(t *testing.T) {
 	config.Overrides["input.dotFolder"] = "true"
+	t.Cleanup(func() {
+		delete(config.Overrides, "input.dotFolder")
+	})
+
+	dir := setupAppendTest(t)
 	e := models.Entry{
 		Title: "something",
 		Date:  time.Now(),
@@ -146,16 +161,21 @@ func (s *AppendTestSuite) TestDotFolder() {
 		Entries: []models.Entry{e},
 	}
 	err := Append(l)
-	s.Require().NoError(err)
-	s.Require().FileExists(s.dir + "/sub/test.log")
-	by, err := os.ReadFile(s.dir + "/sub/test.log")
+	require.NoError(t, err)
+	require.FileExists(t, dir+"/sub/test.log")
+	by, err := os.ReadFile(dir + "/sub/test.log")
 	st := string(by)
-	s.Require().NoError(err)
-	s.Assert().Contains(st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
+	require.NoError(t, err)
+	assert.Contains(t, st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
 }
 
-func (s *AppendTestSuite) TestDotFolderNo() {
+func appendTestDotFolderNo(t *testing.T) {
 	config.Overrides["input.dotFolder"] = "false"
+	t.Cleanup(func() {
+		delete(config.Overrides, "input.dotFolder")
+	})
+
+	dir := setupAppendTest(t)
 	e := models.Entry{
 		Title: "another",
 		Date:  time.Now(),
@@ -165,19 +185,21 @@ func (s *AppendTestSuite) TestDotFolderNo() {
 		Entries: []models.Entry{e},
 	}
 	err := Append(l)
-	s.Require().NoError(err)
-	s.Require().FileExists(s.dir + "/sub.test.log")
-	by, err := os.ReadFile(s.dir + "/sub.test.log")
+	require.NoError(t, err)
+	require.FileExists(t, dir+"/sub.test.log")
+	by, err := os.ReadFile(dir + "/sub.test.log")
 	st := string(by)
-	s.Require().NoError(err)
-	s.Assert().Contains(st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
+	require.NoError(t, err)
+	assert.Contains(t, st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
 }
 
-func (s *AppendTestSuite) TestNoExt() {
+func appendTestNoExt(t *testing.T) {
+	dir := setupAppendTest(t)
 	config.Overrides["input.ext"] = ""
-	defer func() {
+	t.Cleanup(func() {
 		config.Overrides["input.ext"] = "log"
-	}()
+	})
+
 	e := models.Entry{
 		Title: "baz",
 		Date:  time.Now(),
@@ -187,48 +209,49 @@ func (s *AppendTestSuite) TestNoExt() {
 		Entries: []models.Entry{e},
 	}
 	err := Append(l)
-	s.Require().NoError(err)
-	s.Require().FileExists(s.dir + "/foobar")
-	by, err := os.ReadFile(s.dir + "/foobar")
+	require.NoError(t, err)
+	require.FileExists(t, dir+"/foobar")
+	by, err := os.ReadFile(dir + "/foobar")
 	st := string(by)
-	s.Require().NoError(err)
-	s.Assert().Contains(st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
+	require.NoError(t, err)
+	assert.Contains(t, st, fmt.Sprintf("@begin %s - %s", e.Date.Format(models.DateFormat), e.Title))
 }
 
-func (s *AppendTestSuite) TestConfLoadErr() {
+func appendTestConfLoadErr(t *testing.T) {
+	dir := t.ArtifactDir()
+
 	currConf := config.ConfigPath
-	tmp, _ := os.CreateTemp("", "app-conf-*.toml")
+	tmp, _ := os.CreateTemp(dir, "app-conf-*.toml")
 	fname := tmp.Name()
-	defer tmp.Close()
-	defer os.Remove(fname)
+	t.Cleanup(func() { tmp.Close() })
+	t.Cleanup(func() { os.Remove(fname) })
 	fmt.Fprintln(tmp, `{"not":"toml"}`)
 	config.ConfigPath = fname
-	defer func(path string) {
-		config.ConfigPath = path
-	}(currConf)
+	t.Cleanup(func() { config.ConfigPath = currConf })
+
 	err := Append(models.Log{})
-	s.Assert().ErrorContains(err, "toml")
+	assert.ErrorContains(t, err, "toml")
 }
 
-func (s *AppendTestSuite) TestMkdirErr() {
+func appendTestMkdirErr(t *testing.T) {
 	// Don't run this test as root
 	config.Overrides["input.path"] = "/var/my-logs-test"
-	defer func(path string) {
-		config.Overrides["input.path"] = path
-	}(s.dir)
+	t.Cleanup(func() { delete(config.Overrides, "input.path") })
+
 	err := Append(models.Log{})
-	s.Assert().ErrorContains(err, "permission denied")
+	assert.ErrorContains(t, err, "permission denied")
 }
 
-func (s *AppendTestSuite) TestOpenErr() {
+func appendTestOpenErr(t *testing.T) {
+	dir := setupAppendTest(t)
 	l := models.Log{
 		Name: "test-open-err",
 	}
-	fname := s.dir + "/test-open-err.log"
-	os.MkdirAll(s.dir, 0750)
+	fname := dir + "/test-open-err.log"
+	os.MkdirAll(dir, 0750)
 	f, _ := os.Create(fname)
 	f.Close()
-	os.Chmod(fname, 0400) // read only
+	os.Chmod(fname, 0400)
 	err := Append(l)
-	s.Assert().ErrorContains(err, "permission denied")
+	assert.ErrorContains(t, err, "permission denied")
 }
diff --git a/go.mod b/go.mod
index aa282b4..1bc3408 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module codeberg.org/danjones000/my-log
 
-go 1.21.5
+go 1.26.0
 
 require (
 	github.com/BurntSushi/toml v1.3.2