diff --git a/Dockerfile b/Dockerfile
index 1e4024e..dac4393 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.15.0
+FROM alpine:3.13.7
RUN adduser -u 9000 -D app
@@ -20,14 +20,9 @@ RUN apk add --no-cache \
php7-tokenizer \
php7-xml \
php7-xmlwriter \
- php7-zlib && \
- EXPECTED_SIGNATURE=$(php -r "echo file_get_contents('https://composer.github.io/installer.sig');") && \
- php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" && \
- ACTUAL_SIGNATURE=$(php -r "echo hash_file('SHA384', 'composer-setup.php');") && \
- [ "$EXPECTED_SIGNATURE" = "$ACTUAL_SIGNATURE" ] || (echo "Invalid Composer installer signature"; exit 1) && \
- php composer-setup.php --quiet && \
- mv composer.phar /usr/local/bin/composer && \
- rm -r composer-setup.php ~/.composer
+ php7-zlib
+
+COPY --from=composer /usr/bin/composer /usr/local/bin/composer
COPY composer.json composer.lock ./
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