diff --git a/version.go b/version.go
index 70e2c7a..0e2fbee 100644
--- a/version.go
+++ b/version.go
@@ -1,6 +1,20 @@
 package main
 
-const (
-	goVersion       = "1.16.5"
-	hotbuildVersion = "v1.0.3"
+import (
+	"log"
+	"os"
 )
+
+var goVersion = "1.16.5"
+var Version = ""
+
+func init() {
+	if Version == "" {
+		v, err := os.ReadFile("./version.txt")
+		if err != nil {
+			log.Printf("read ./version.txt failed: %v", err)
+			return
+		}
+		Version = string(v)
+	}
+}