diff --git a/go.mod b/go.mod
index bafd824..90da8d7 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module git.korhonen.cc/FunctionalHacker/korhonen.cc
 
 go 1.21.6
 
-require github.com/hugo-toha/toha/v4 v4.8.0 // indirect
+require github.com/hugo-toha/toha/v4 v4.9.0 // indirect
diff --git a/go.sum b/go.sum
index dfaf668..5dd8b7c 100644
--- a/go.sum
+++ b/go.sum
@@ -4,3 +4,5 @@ github.com/hugo-toha/toha/v4 v4.7.0 h1:XmMLJRXoYKd8UmM3RTh0Kwe6+7l9/JnUi51c86h+G
 github.com/hugo-toha/toha/v4 v4.7.0/go.mod h1:TU/6WXz7fJ3BSrTS+K/sVctzUMF4pB4ZwKWzFBFra8g=
 github.com/hugo-toha/toha/v4 v4.8.0 h1:TYNqOsr01q73R5Sgz7lonXoX39dIl22lZhQy/V421so=
 github.com/hugo-toha/toha/v4 v4.8.0/go.mod h1:TU/6WXz7fJ3BSrTS+K/sVctzUMF4pB4ZwKWzFBFra8g=
+github.com/hugo-toha/toha/v4 v4.9.0 h1:FX5i3I7eP/lpAQZv4SjnKw5jw0aowCFBGjc+pW1W6PA=
+github.com/hugo-toha/toha/v4 v4.9.0/go.mod h1:TU/6WXz7fJ3BSrTS+K/sVctzUMF4pB4ZwKWzFBFra8g=