diff --git a/go.mod b/go.mod
index f4b2aa9..78276d8 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,10 @@ require (
 	github.com/boltdb/bolt v1.3.1
 	github.com/br0xen/termbox-util v0.0.0-20170904143325-de1d4c83380e
 	github.com/nsf/termbox-go v1.1.1
+)
+
+require (
+	github.com/mattn/go-runewidth v0.0.9 // indirect
 	golang.org/x/sys v0.6.0 // indirect
 )
 
diff --git a/go.sum b/go.sum
index 9e0e1ae..e51a13a 100644
--- a/go.sum
+++ b/go.sum
@@ -2,15 +2,9 @@ github.com/boltdb/bolt v1.3.1 h1:JQmyP4ZBrce+ZQu0dY660FMfatumYDLun9hBCUVIkF4=
 github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
 github.com/br0xen/termbox-util v0.0.0-20170904143325-de1d4c83380e h1:PF4gYXcZfTbAoAk5DPZcvjmq8gyg4gpcmWdT8W+0X1c=
 github.com/br0xen/termbox-util v0.0.0-20170904143325-de1d4c83380e/go.mod h1:x9wJlgOj74OFTOBwXOuO8pBguW37EgYNx51Dbjkfzo4=
-github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
-github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/nsf/termbox-go v0.0.0-20180819125858-b66b20ab708e h1:fvw0uluMptljaRKSU8459cJ4bmi3qUYyMs5kzpic2fY=
-github.com/nsf/termbox-go v0.0.0-20180819125858-b66b20ab708e/go.mod h1:IuKpRQcYE1Tfu+oAQqaLisqDeXgjyyltCfsaoYN18NQ=
 github.com/nsf/termbox-go v1.1.1 h1:nksUPLCb73Q++DwbYUBEglYBRPZyoXJdrj5L+TkjyZY=
 github.com/nsf/termbox-go v1.1.1/go.mod h1:T0cTdVuOwf7pHQNtfhnEbzHbcNyCEcVU4YPpouCbVxo=
-golang.org/x/sys v0.0.0-20191002091554-b397fe3ad8ed h1:5TJcLJn2a55mJjzYk0yOoqN8X1OdvBDUnaZaKKyQtkY=
-golang.org/x/sys v0.0.0-20191002091554-b397fe3ad8ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=