diff --git a/README.md b/README.md
index 9ffe5ee..ae3ec3d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # A simple assertion library using Go generics
 
-[![PkgGoDev](https://pkg.go.dev/badge/github.com/alecthomas/assert/v2)](https://pkg.go.dev/github.com/alecthomas/assert/v2) [![CI](https://github.com/alecthomas/assert/actions/workflows/ci.yml/badge.svg)](https://github.com/alecthomas/assert/actions/workflows/ci.yml) 
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/alecthomas/assert/v2)](https://pkg.go.dev/github.com/alecthomas/assert/v2) [![CI](https://github.com/alecthomas/assert/actions/workflows/ci.yml/badge.svg)](https://github.com/alecthomas/assert/actions/workflows/ci.yml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/alecthomas/assert/v2)](https://goreportcard.com/report/github.com/alecthomas/assert/v2) [![Slack chat](https://img.shields.io/static/v1?logo=slack&style=flat&label=slack&color=green&message=gophers)](https://gophers.slack.com/messages/CN9DS8YF3)
 
 
@@ -35,55 +35,55 @@ format error messages using the `fmt` package.
 // Equal asserts that "expected" and "actual" are equal using google/go-cmp.
 //
 // If they are not, a diff of the Go representation of the values will be displayed.
-func Equal[T comparable](t testing.TB, expected, actual T, msgAndArgs ...interface{})
+func Equal[T comparable](t testing.TB, expected, actual T, msgAndArgs ...any)
 
 // NotEqual asserts that "expected" is not equal to "actual" using google/go-cmp.
 //
 // If they are equal the expected value will be displayed.
-func NotEqual[T comparable](t testing.TB, expected, actual T, msgAndArgs ...interface{})
+func NotEqual[T comparable](t testing.TB, expected, actual T, msgAndArgs ...any)
 
 // Zero asserts that a value is its zero value.
-func Zero[T comparable](t testing.TB, value T, msgAndArgs ...interface{})
+func Zero[T comparable](t testing.TB, value T, msgAndArgs ...any)
 
 // NotZero asserts that a value is not its zero value.
-func NotZero[T comparable](t testing.TB, value T, msgAndArgs ...interface{})
+func NotZero[T comparable](t testing.TB, value T, msgAndArgs ...any)
 
 // Contains asserts that "haystack" contains "needle".
-func Contains(t testing.TB, haystack string, needle string, msgAndArgs ...interface{})
+func Contains(t testing.TB, haystack string, needle string, msgAndArgs ...any)
 
 // NotContains asserts that "haystack" does not contain "needle".
-func NotContains(t testing.TB, haystack string, needle string, msgAndArgs ...interface{})
+func NotContains(t testing.TB, haystack string, needle string, msgAndArgs ...any)
 
 // EqualError asserts that either an error is non-nil and that its message is what is expected,
 // or that error is nil if the expected message is empty.
-func EqualError(t testing.TB, err error, errString string, msgAndArgs...interface{})
+func EqualError(t testing.TB, err error, errString string, msgAndArgs ...any)
 
 // Error asserts that an error is not nil.
-func Error(t testing.TB, err error, msgAndArgs ...interface{})
+func Error(t testing.TB, err error, msgAndArgs ...any)
 
 // NoError asserts that an error is nil.
-func NoError(t testing.TB, err error, msgAndArgs ...interface{})
+func NoError(t testing.TB, err error, msgAndArgs ...any)
 
 // IsError asserts than any error in "err"'s tree matches "target".
-func IsError(t testing.TB, err, target error, msgAndArgs ...interface{})
+func IsError(t testing.TB, err, target error, msgAndArgs ...any)
 
 // NotIsError asserts than no error in "err"'s tree matches "target".
-func NotIsError(t testing.TB, err, target error, msgAndArgs ...interface{})
+func NotIsError(t testing.TB, err, target error, msgAndArgs ...any)
 
 // Panics asserts that the given function panics.
-func Panics(t testing.TB, fn func(), msgAndArgs ...interface{})
+func Panics(t testing.TB, fn func(), msgAndArgs ...any)
 
 // NotPanics asserts that the given function does not panic.
-func NotPanics(t testing.TB, fn func(), msgAndArgs ...interface{})
+func NotPanics(t testing.TB, fn func(), msgAndArgs ...any)
 
 // Compare two values for equality and return true or false.
 func Compare[T any](t testing.TB, x, y T) bool
 
 // True asserts that an expression is true.
-func True(t testing.TB, ok bool, msgAndArgs ...interface{})
+func True(t testing.TB, ok bool, msgAndArgs ...any)
 
 // False asserts that an expression is false.
-func False(t testing.TB, ok bool, msgAndArgs ...interface{})
+func False(t testing.TB, ok bool, msgAndArgs ...any)
 ```
 
 ## Evaluation process
diff --git a/assert.go b/assert.go
index 261beaf..0b481f4 100644
--- a/assert.go
+++ b/assert.go
@@ -125,7 +125,7 @@ func NotContains(t testing.TB, haystack string, needle string, msgAndArgs ...any
 }
 
 // SliceContains asserts that "haystack" contains "needle".
-func SliceContains[T any](t testing.TB, haystack []T, needle T, msgAndArgs ...interface{}) {
+func SliceContains[T any](t testing.TB, haystack []T, needle T, msgAndArgs ...any) {
 	t.Helper()
 	for _, item := range haystack {
 		if objectsAreEqual(item, needle) {
@@ -140,7 +140,7 @@ func SliceContains[T any](t testing.TB, haystack []T, needle T, msgAndArgs ...in
 }
 
 // NotSliceContains asserts that "haystack" does not contain "needle".
-func NotSliceContains[T any](t testing.TB, haystack []T, needle T, msgAndArgs ...interface{}) {
+func NotSliceContains[T any](t testing.TB, haystack []T, needle T, msgAndArgs ...any) {
 	t.Helper()
 	for _, item := range haystack {
 		if objectsAreEqual(item, needle) {
@@ -159,8 +159,12 @@ func Zero[T any](t testing.TB, value T, msgAndArgs ...any) {
 		return
 	}
 	val := reflect.ValueOf(value)
-	if (val.Kind() == reflect.Slice || val.Kind() == reflect.Map || val.Kind() == reflect.Array) && val.Len() == 0 {
-		return
+	switch val.Kind() {
+	case reflect.Slice, reflect.Map, reflect.Array:
+		if val.Len() == 0 {
+			return
+		}
+	default:
 	}
 	t.Helper()
 	msg := formatMsgAndArgs("Expected a zero value but got:", msgAndArgs...)
@@ -172,7 +176,12 @@ func NotZero[T any](t testing.TB, value T, msgAndArgs ...any) {
 	var zero T
 	if !objectsAreEqual(value, zero) {
 		val := reflect.ValueOf(value)
-		if !((val.Kind() == reflect.Slice || val.Kind() == reflect.Map || val.Kind() == reflect.Array) && val.Len() == 0) {
+		switch val.Kind() {
+		case reflect.Slice, reflect.Map, reflect.Array:
+			if val.Len() > 0 {
+				return
+			}
+		default:
 			return
 		}
 	}
diff --git a/assert_test.go b/assert_test.go
index 4a01f1b..227f6b3 100644
--- a/assert_test.go
+++ b/assert_test.go
@@ -217,11 +217,11 @@ type testTester struct {
 	failed string
 }
 
-func (t *testTester) Fatalf(message string, args ...interface{}) {
+func (t *testTester) Fatalf(message string, args ...any) {
 	t.failed = fmt.Sprintf(message, args...)
 }
 
-func (t *testTester) Fatal(args ...interface{}) {
+func (t *testTester) Fatal(args ...any) {
 	t.failed = fmt.Sprint(args...)
 }