diff --git a/context.go b/context.go
index b9aa184..d1ad4d8 100644
--- a/context.go
+++ b/context.go
@@ -2,9 +2,7 @@ package ilog
 
 import "context"
 
-type contextKey string
-
-const contextKeyLogger contextKey = "Logger"
+type contextKeyLogger struct{}
 
 func FromContext(ctx context.Context) (logger Logger) {
 	if ctx == nil {
@@ -12,7 +10,7 @@ func FromContext(ctx context.Context) (logger Logger) {
 		return Global().Copy()
 	}
 
-	v := ctx.Value(contextKeyLogger)
+	v := ctx.Value(contextKeyLogger{})
 	l, ok := v.(Logger)
 
 	if !ok {
@@ -24,5 +22,5 @@ func FromContext(ctx context.Context) (logger Logger) {
 }
 
 func WithContext(ctx context.Context, logger Logger) context.Context {
-	return context.WithValue(ctx, contextKeyLogger, logger)
+	return context.WithValue(ctx, contextKeyLogger{}, logger)
 }
diff --git a/context_test.go b/context_test.go
index 9f667a3..13bad4a 100644
--- a/context_test.go
+++ b/context_test.go
@@ -35,7 +35,7 @@ func TestContext(t *testing.T) {
 	t.Run("failure,invalidType", func(t *testing.T) {
 		buf := bytes.NewBuffer(nil)
 		defer SetGlobal(NewBuilder(DebugLevel, buf).SetTimestampZone(time.UTC).Build())()
-		_ = FromContext(context.WithValue(context.Background(), contextKeyLogger, "invalid")) //nolint:staticcheck
+		_ = FromContext(context.WithValue(context.Background(), contextKeyLogger{}, "invalid")) //nolint:staticcheck
 		if expected := regexp.MustCompilePOSIX(`{"severity":"ERROR","timestamp":"[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.?[0-9]*Z","caller":"ilog\.go/[a-z_]+\.go:[0-9]+","message":"ilog: type assertion failed: expected=ilog.Logger, actual=string, value=\\"invalid\\""}`); !expected.Match(buf.Bytes()) {
 			t.Errorf("❌: !expected.Match(buf.Bytes()):\n%s", buf)
 		}
diff --git a/ilog.go b/ilog.go
index 12f2e7f..a03dd54 100644
--- a/ilog.go
+++ b/ilog.go
@@ -26,11 +26,11 @@ type Logger interface {
 	// Level returns the current logging level of the logger.
 	Level() (currentLoggerLevel Level)
 	// SetLevel sets the logging level of the logger.
-	SetLevel(level Level) (logger Logger)
+	SetLevel(level Level) (copied Logger)
 	// AddCallerSkip adds the number of stack frames to skip to the logger.
-	AddCallerSkip(skip int) (logger Logger)
+	AddCallerSkip(skip int) (copied Logger)
 	// Copy returns a copy of the logger.
-	Copy() (copiedLogger Logger)
+	Copy() (copied Logger)
 
 	// Common is the interface that has the common logging methods for both ilog.Logger and ilog.LogEntry.
 	Common
@@ -84,7 +84,7 @@ type LogEntry interface {
 	Common
 
 	// Logger returns a new logger with the same fields of the log entry.
-	Logger() (copiedLogger Logger)
+	Logger() (copied Logger)
 
 	// error: for considering undispatched LogEntry as error so that they can be detected by Go static analysis.
 	error
diff --git a/ilog_default_implementation.go b/ilog_default_implementation.go
index 53f6281..3590118 100644
--- a/ilog_default_implementation.go
+++ b/ilog_default_implementation.go
@@ -147,13 +147,15 @@ func (l *implLogger) Level() Level {
 }
 
 func (l *implLogger) SetLevel(level Level) Logger {
-	l.config.level = level
-	return l
+	copied := l.copy()
+	copied.config.level = level
+	return copied
 }
 
 func (l *implLogger) AddCallerSkip(skip int) Logger {
-	l.config.callerSkip += skip
-	return l
+	copied := l.copy()
+	copied.config.callerSkip += skip
+	return copied
 }
 
 func (l *implLogger) Copy() Logger {
diff --git a/implementations/zap/zap.go b/implementations/zap/zap.go
index fab7bb5..249fe3a 100644
--- a/implementations/zap/zap.go
+++ b/implementations/zap/zap.go
@@ -25,13 +25,15 @@ func (l *implLogger) Level() ilog.Level {
 }
 
 func (l *implLogger) SetLevel(level ilog.Level) ilog.Logger {
-	l.level = level
-	return l
+	copied := l.copy()
+	copied.level = level
+	return copied
 }
 
 func (l *implLogger) AddCallerSkip(skip int) ilog.Logger {
-	l.zapLogger = l.zapLogger.WithOptions(zap.AddCallerSkip(skip))
-	return l
+	copied := l.copy()
+	copied.zapLogger = l.zapLogger.WithOptions(zap.AddCallerSkip(skip))
+	return copied
 }
 
 func (l *implLogger) Copy() ilog.Logger {
diff --git a/implementations/zerolog/zerolog.go b/implementations/zerolog/zerolog.go
index 9057251..cdad909 100644
--- a/implementations/zerolog/zerolog.go
+++ b/implementations/zerolog/zerolog.go
@@ -25,14 +25,16 @@ func (l *implLogger) Level() ilog.Level {
 }
 
 func (l *implLogger) SetLevel(level ilog.Level) ilog.Logger {
-	l.level = level
-	return l
+	copied := l.copy()
+	copied.level = level
+	return copied
 }
 
 func (l *implLogger) AddCallerSkip(skip int) ilog.Logger {
+	copied := l.copy()
 	logger := l.zerologLogger.With().Caller().CallerWithSkipFrameCount(skip).Logger()
-	l.zerologLogger = &logger
-	return l
+	copied.zerologLogger = &logger
+	return copied
 }
 
 func (l *implLogger) Copy() ilog.Logger {