Change composer download
diff --git a/kokoro/linux/dockerfile/test/php_32bit/Dockerfile b/kokoro/linux/dockerfile/test/php_32bit/Dockerfile
index d657af1..2fd620e 100644
--- a/kokoro/linux/dockerfile/test/php_32bit/Dockerfile
+++ b/kokoro/linux/dockerfile/test/php_32bit/Dockerfile
@@ -47,8 +47,10 @@
&& make install
# Install composer
-RUN curl -sS https://getcomposer.org/installer | php
-RUN mv composer.phar /usr/local/bin/composer
+RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
+RUN php composer-setup.php
+RUN mv composer.phar /usr/bin/composer
+RUN php -r "unlink('composer-setup.php');"
# Download php source code
RUN git clone https://github.com/php/php-src