diff --git a/go.mod b/go.mod
index e5377f3..caa3a36 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/evolbioinfo/gotree
 
-go 1.16
+go 1.18
 
 require (
 	github.com/ajstarks/svgo v0.0.0-20210406150507-75cfd577ce75
@@ -14,3 +14,16 @@ require (
 	github.com/spf13/cobra v1.1.3
 	golang.org/x/image v0.0.0-20210504121937-7319ad40d33e
 )
+
+require (
+	github.com/abiosoft/ishell v2.0.0+incompatible // indirect
+	github.com/abiosoft/readline v0.0.0-20180607040430-155bce2042db // indirect
+	github.com/armon/go-radix v1.0.0 // indirect
+	github.com/fatih/color v1.10.0 // indirect
+	github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/mattn/go-colorable v0.1.8 // indirect
+	github.com/mattn/go-isatty v0.0.12 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/sys v0.0.0-20210324051608-47abb6519492 // indirect
+)