diff --git a/exampleSite/go.mod b/exampleSite/go.mod
index a52b41195..58d7f4d90 100644
--- a/exampleSite/go.mod
+++ b/exampleSite/go.mod
@@ -1,6 +1,6 @@
 module github.com/hugo-toha/toha/exampleSite
 
-go 1.22
+go 1.21
 
 replace github.com/hugo-toha/toha/v4 => ../
 
diff --git a/go.mod b/go.mod
index d4200ab5a..66bf76675 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module github.com/hugo-toha/toha/v4
 
-go 1.22
+go 1.21