diff --git a/go.mod b/go.mod
index ff7252b..07d789f 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module git.yetaga.in/alazyreader/libyear
 
 go 1.25.1
 
-require golang.org/x/mod v0.32.0
+require golang.org/x/mod v0.33.0
diff --git a/go.sum b/go.sum
index 697e005..52ba041 100644
--- a/go.sum
+++ b/go.sum
@@ -8,3 +8,5 @@ golang.org/x/mod v0.31.0 h1:HaW9xtz0+kOcWKwli0ZXy79Ix+UW/vOfmWI5QVd2tgI=
 golang.org/x/mod v0.31.0/go.mod h1:43JraMp9cGx1Rx3AqioxrbrhNsLl2l/iNAvuBkrezpg=
 golang.org/x/mod v0.32.0 h1:9F4d3PHLljb6x//jOyokMv3eX+YDeepZSEo3mFJy93c=
 golang.org/x/mod v0.32.0/go.mod h1:SgipZ/3h2Ci89DlEtEXWUk/HteuRin+HHhN+WbNhguU=
+golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
+golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=