diff --git a/level.go b/level.go
index 3a52aaa..4974c30 100644
--- a/level.go
+++ b/level.go
@@ -60,11 +60,6 @@ var allLevels = map[Level][]string{
 	TraceLevel: {"trace", "TRACE", "tac", "TAC"},
 }
 
-// AllLevels returns all supported log levels.
-func AllLevels() []Level {
-	return []Level{PanicLevel, FatalLevel, ErrorLevel, WarnLevel, InfoLevel, DebugLevel, TraceLevel}
-}
-
 // String returns the string form of the current level.
 // If the log level is not supported, always returns "unknown".
 func (level Level) String() string {
diff --git a/level_test.go b/level_test.go
index 24bf45c..5763321 100644
--- a/level_test.go
+++ b/level_test.go
@@ -15,21 +15,9 @@
 package logger
 
 import (
-	"fmt"
 	"testing"
 )
 
-func TestAllLevels(t *testing.T) {
-	ls := AllLevels()
-	if len(ls) != 7 {
-		t.Fatalf("AllLevels(): %v", ls)
-	}
-	want := []Level{PanicLevel, FatalLevel, ErrorLevel, WarnLevel, InfoLevel, DebugLevel, TraceLevel}
-	if fmt.Sprint(ls) != fmt.Sprint(want) {
-		t.Fatalf("AllLevels(): %v", ls)
-	}
-}
-
 func TestLevel_String(t *testing.T) {
 	items := []struct {
 		Given Level