diff --git a/go.mod b/go.mod
index cebe64f..443f0d2 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/satorunooshie/asn
 
-go 1.20
+go 1.21
 
 require github.com/lestrrat-go/jwx/v2 v2.0.11