diff --git a/src/Composer/Factory.php b/src/Composer/Factory.php
index 7998c8be6..e6718278f 100644
--- a/src/Composer/Factory.php
+++ b/src/Composer/Factory.php
@@ -595,6 +595,7 @@ class Factory
             if ($config && $config->get('capath')) {
                 $remoteFilesystemOptions['ssl']['capath'] = $config->get('capath');
             }
+            $remoteFilesystemOptions = array_replace_recursive($remoteFilesystemOptions, $options);
         }
         try {
             $remoteFilesystem = new RemoteFilesystem($io, $config, $remoteFilesystemOptions, $disableTls);