diff --git a/go.mod b/go.mod
index bc92c5d..b27286e 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,6 @@ module github.com/yuya-takeyama/ntimes
 
 go 1.18
 
-require github.com/jessevdk/go-flags v1.5.0
+require github.com/jessevdk/go-flags v1.6.0
+
+require golang.org/x/sys v0.21.0 // indirect
diff --git a/go.sum b/go.sum
index 3c41b56..133fda0 100644
--- a/go.sum
+++ b/go.sum
@@ -2,5 +2,9 @@ github.com/jessevdk/go-flags v1.4.0 h1:4IU2WS7AumrZ/40jfhf4QVDMsQwqA7VEHozFRrGAR
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jessevdk/go-flags v1.5.0 h1:1jKYvbxEjfUl0fmqTCOfonvskHHXMjBySTLW4y9LFvc=
 github.com/jessevdk/go-flags v1.5.0/go.mod h1:Fw0T6WPc1dYxT4mKEZRfG5kJhaTDP9pj1c2EWnYs/m4=
+github.com/jessevdk/go-flags v1.6.0 h1:jR30gPXVzh+YBCwCzF0/VMiqZHhPrzIcLsWvFxQbg0I=
+github.com/jessevdk/go-flags v1.6.0/go.mod h1:Mk8T1hIAWpOiJiHa9rJASDK2UGWji0EuPGBnNLMooyc=
 golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 h1:EZ2mChiOa8udjfp6rRmswTbtZN/QzUQp4ptM4rnjHvc=
 golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
+golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=