diff --git a/json/reflect.go b/json/reflect.go
index 3a5c6f1..6edd80e 100644
--- a/json/reflect.go
+++ b/json/reflect.go
@@ -1,5 +1,5 @@
-//go:build go1.18
-// +build go1.18
+//go:build go1.20
+// +build go1.20
 
 package json
 
diff --git a/json/reflect_optimize.go b/json/reflect_optimize.go
index 6936cef..6588433 100644
--- a/json/reflect_optimize.go
+++ b/json/reflect_optimize.go
@@ -1,5 +1,5 @@
-//go:build !go1.18
-// +build !go1.18
+//go:build !go1.20
+// +build !go1.20
 
 package json