diff --git a/.github/workflows/docker-build-self.yml b/.github/workflows/docker-build-self.yml
index f49563f..53e8ff4 100644
--- a/.github/workflows/docker-build-self.yml
+++ b/.github/workflows/docker-build-self.yml
@@ -55,6 +55,7 @@ jobs:
         run: |
           docker run -d --name $IMAGE_NAME -p $PORT:54321 --restart=always \
           -v  "/volume2/docker/$IMAGE_NAME/data:/app/data" \
+          -e BUILD_NUMBER=${{ github.run_number }} \
           "$IMAGE_NAME:latest"
 
       - name: Cleanup
diff --git a/src/main.go b/src/main.go
index 97f7e45..a4e163a 100644
--- a/src/main.go
+++ b/src/main.go
@@ -44,7 +44,6 @@ var (
 
 func main() {
 	e.Renderer = NewTemplates()
-	// read the ./build_number file
 
 	e.Logger.SetLevel(log.DEBUG)
 	e.Use(middleware.Logger())
diff --git a/src/util/build-number.go b/src/util/build-number.go
index e31a4cb..3501a9c 100644
--- a/src/util/build-number.go
+++ b/src/util/build-number.go
@@ -1,20 +1,9 @@
 package util
 
 import (
-	"fmt"
 	"os"
 )
 
-var buildNumber string
-
 func GetBuildNumber() string {
-	if buildNumber == "" {
-		b, err := os.ReadFile("build_number") // just pass the file name
-		if err != nil {
-			fmt.Print(err)
-		}
-		buildNumber = string(b)
-	}
-
-	return buildNumber
+	return os.Getenv("BUILD_NUMBER")
 }