diff --git a/Dockerfile b/Dockerfile
index a2935bd..d4912b8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,17 +1,13 @@
 FROM reg.zknt.org/zknt/debian-php as builder
 
 RUN set -xe;\
-  apt-install git php-curl php-zip php-bcmath php-intl php-mbstring php-xml &&\
-  php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" &&\
-  php -r "if (hash_file('sha384', 'composer-setup.php') === 'e0012edf3e80b6978849f5eff0d4b4e4c79ff1609dd1e613307e16318854d24ae64f26d17af3ef0bf7cfb710ca74755a') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" &&\
-  php composer-setup.php &&\
-  php -r "unlink('composer-setup.php');" &&\
-  php composer.phar global require hirak/prestissimo --no-interaction --no-suggest --prefer-dist &&\
+  apt-install git php-curl php-zip php-bcmath php-intl php-mbstring php-xml composer &&\
+  composer global require hirak/prestissimo --no-interaction --no-suggest --prefer-dist &&\
   cd /var && rm -rf www &&\
   git clone https://github.com/pixelfed/pixelfed.git www &&\
   cd www &&\
   curl -L https://github.com/hnrd/pixelfed/commit/6e822b67c50dfb6cc6dc352ce80bf3326b06cca9.patch | git apply &&\
-  php /composer.phar install --prefer-dist --no-interaction --no-ansi --optimize-autoloader &&\
+  composer install --prefer-dist --no-interaction --no-ansi --optimize-autoloader &&\
   ln -s public html &&\
   chown -R www-data:www-data /var/www &&\
   cp -r storage storage.skel &&\