diff --git a/go.mod b/go.mod
index 0aa3f0e..bc92c5d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module github.com/yuya-takeyama/ntimes
 
-go 1.15
+go 1.18
 
 require github.com/jessevdk/go-flags v1.5.0