diff --git a/Dockerfile b/Dockerfile
index 90476b436cb..abaea3ccd06 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -64,12 +64,12 @@ RUN chown www-data:www-data /var/www \
 RUN curl -sS https://getcomposer.org/installer \
   | php \
   && mv composer.phar /usr/bin/composer \
-  && composer selfupdate --1 \
-  && composer config -g repos.packagist composer https://packagist.jp \
-  && composer global require hirak/prestissimo
+  && composer selfupdate --1
 
 # 全体コピー前にcomposer installを先行完了させる(docker cache利用によるリビルド速度向上)
 USER www-data
+RUN composer config -g repos.packagist composer https://packagist.jp \
+  && composer global require hirak/prestissimo
 COPY composer.json ${APACHE_DOCUMENT_ROOT}/composer.json
 COPY composer.lock ${APACHE_DOCUMENT_ROOT}/composer.lock
 RUN composer install \