diff --git a/go.mod b/go.mod
index c1935dd..a4f6967 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module github.com/int128/oauth2dev
 
 go 1.25.0
 
-toolchain go1.26.2
+toolchain go1.26.3
 
 require (
 	github.com/google/go-cmp v0.7.0