diff --git a/main.go b/main.go
index 7e47e7c..7041b63 100644
--- a/main.go
+++ b/main.go
@@ -37,6 +37,8 @@ import (
 	"github.com/IrineSistiana/simple-tls/core"
 )
 
+var version = "unknown/dev"
+
 func main() {
 	log.Printf("main: simple-tls %s", version)
 	go func() {
diff --git a/version.go b/version.go
deleted file mode 100644
index fc8b1f8..0000000
--- a/version.go
+++ /dev/null
@@ -1,20 +0,0 @@
-//     Copyright (C) 2020, IrineSistiana
-//
-//     This file is part of simple-tls.
-//
-//     simple-tls is free software: you can redistribute it and/or modify
-//     it under the terms of the GNU General Public License as published by
-//     the Free Software Foundation, either version 3 of the License, or
-//     (at your option) any later version.
-//
-//     simple-tls is distributed in the hope that it will be useful,
-//     but WITHOUT ANY WARRANTY; without even the implied warranty of
-//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-//     GNU General Public License for more details.
-//
-//     You should have received a copy of the GNU General Public License
-//     along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-package main
-
-var version = "v0.4.0"