diff --git a/Dockerfile b/Dockerfile
index 1778874..787f57a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,5 +2,6 @@ FROM php:8-cli-alpine
 
 RUN apk add --no-cache --virtual .persistent-deps libffi-dev \
     && docker-php-ext-configure ffi --with-ffi \
-    && docker-php-ext-install ffi \
-    && apk add --no-cache --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing/ php8-phpdbg
+    && docker-php-ext-install ffi
+
+RUN apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing php8-phpdbg