diff --git a/_examples/tcp/go.mod b/_examples/tcp/go.mod
index b1625c4..6ec9028 100644
--- a/_examples/tcp/go.mod
+++ b/_examples/tcp/go.mod
@@ -1,6 +1,6 @@
 module github.com/syumai/workers/_examples/fetch
 
-go 1.18
+go 1.21.3
 
 require github.com/syumai/workers v0.0.0