diff --git a/dockerfile/php.dockerfile b/dockerfile/php.dockerfile
index c774555..c876c0a 100644
--- a/dockerfile/php.dockerfile
+++ b/dockerfile/php.dockerfile
@@ -1,5 +1,6 @@
 ARG image
 FROM $image
+RUN echo "https://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
 RUN apk add --no-cache --update php81 \
     php81-mbstring \
     php81-session \