diff --git a/go.mod b/go.mod
index 61b8e21..5b553be 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module git.yetaga.in/alazyreader/libyear
 
 go 1.22.0
 
-toolchain go1.23.0
+toolchain go1.23.1
 
 require golang.org/x/mod v0.21.0