diff --git a/go.mod b/go.mod
index d421e2f..c2bf5cc 100644
--- a/go.mod
+++ b/go.mod
@@ -8,4 +8,4 @@ require (
 	golang.org/x/sync v0.8.0
 )
 
-require golang.org/x/mod v0.20.0 // indirect
+require golang.org/x/mod v0.21.0 // indirect
diff --git a/go.sum b/go.sum
index bcf23ff..4a169bd 100644
--- a/go.sum
+++ b/go.sum
@@ -2,7 +2,7 @@ github.com/youta-t/its v0.5.0 h1:KScN5T5OHZPcj4KdPWmoOjLSyMRbG21LPB2dijxQKQA=
 github.com/youta-t/its v0.5.0/go.mod h1:BIW52yCMszkfw3y00YtIB5I5EP10+vVJFu3cV78DqlU=
 golang.org/x/image v0.20.0 h1:7cVCUjQwfL18gyBJOmYvptfSHS8Fb3YUDtfLIZ7Nbpw=
 golang.org/x/image v0.20.0/go.mod h1:0a88To4CYVBAHp5FXJm8o7QbUl37Vd85ply1vyD8auM=
-golang.org/x/mod v0.20.0 h1:utOm6MM3R3dnawAiJgn0y+xvuYRsm1RKM/4giyfDgV0=
-golang.org/x/mod v0.20.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.21.0 h1:vvrHzRwRfVKSiLrG+d4FMl/Qi4ukBCE6kZlTUkDYRT0=
+golang.org/x/mod v0.21.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
 golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
 golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=