diff --git a/src/adapters/web/page_handlers.go b/src/adapters/web/page_handlers.go
index b9cd617..fb91398 100644
--- a/src/adapters/web/page_handlers.go
+++ b/src/adapters/web/page_handlers.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os"
 	"strconv"
 	"strings"
 
@@ -125,7 +126,7 @@ func (web *Web) redirectHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (web *Web) qrHandler(w http.ResponseWriter, r *http.Request) {
-	png, err := qrcode.Encode("https://scvl.jp"+strings.Split(r.RequestURI, "/qr.png")[0], qrcode.Medium, 256)
+  png, err := qrcode.Encode("https://"+os.Getenv("MAIN_DOMAIN")+strings.Split(r.RequestURI, "/qr.png")[0], qrcode.Medium, 256)
 	if err != nil {
 		log.Println("Failed to generate QR code: ", err)
 		http.Error(w, "Failed to generate QR code", http.StatusInternalServerError)
diff --git a/src/engine/image.go b/src/engine/image.go
index 3c9003b..beb7fd6 100644
--- a/src/engine/image.go
+++ b/src/engine/image.go
@@ -14,6 +14,8 @@ import (
 	"image/gif"
 	"image/jpeg"
 	"image/png"
+
+	"os"
 )
 
 // UploadImageRequest is the request struct for the UploadImage function
@@ -51,7 +53,7 @@ func (e *Engine) UploadImage(req UploadImageRequest) (dimg *domain.Image, err er
 	}
 	imgBase64Str := prefix + base64.StdEncoding.EncodeToString(buf.Bytes())
 
-	resp, err := http.Post("https://images.scvl.jp", "application/json", bytes.NewReader([]byte(`{"image": "`+imgBase64Str+`"}`)))
+	resp, err := http.Post("https://"+os.Getenv("IMAGE_DOMAIN"), "application/json", bytes.NewReader([]byte(`{"image": "`+imgBase64Str+`"}`)))
 	if err != nil {
 		return
 	}