diff --git a/docs/install.sh b/docs/install.sh
index 0365dc1..84bfb6f 100644
--- a/docs/install.sh
+++ b/docs/install.sh
@@ -299,8 +299,8 @@ EOF
     sed -i "s/DB_USERNAME=root/DB_USERNAME=$DB_USER/g" /var/www/cp/.env
     sed -i "s/DB_PASSWORD=/DB_PASSWORD=$DB_PASSWORD/g" /var/www/cp/.env
     
-    php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
-    EXPECTED_SIGNATURE="$(wget -q -O - https://composer.github.io/installer.sig)"
+    curl -4sS https://getcomposer.org/installer -o composer-setup.php
+    EXPECTED_SIGNATURE="$(wget -4 -q -O - https://composer.github.io/installer.sig)"
     ACTUAL_SIGNATURE="$(php -r "echo hash_file('sha384', 'composer-setup.php');")"
 
     if [ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]