Uncaught Error: Call to undefined method Composer

前提・実現したいこと

composerでsymfonyのプロジェクトを作成しようとした際、下記エラーが出ました。
特にcomposerの設定などは変更してません。
どうすれば解決できますでしょうか。よろしくお願いいたします。

発生している問題・エラーメッセージ

PHP Fatal error:  Uncaught Error: Call to undefined method Composer\DependencyResolver\Request::getFixedOrLockedPackages() in /Users/youplus/Public/nyuumon/vendor/symfony/flex/src/Flex.php:885
Stack trace:
#0 [internal function]: Symfony\Flex\Flex->truncatePackages(Object(Composer\Plugin\PrePoolCreateEvent))
#1 phar:///usr/local/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(170): call_user_func(Array, Object(Composer\Plugin\PrePoolCreateEvent))
#2 phar:///usr/local/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(91): Composer\EventDispatcher\EventDispatcher->doDispatch(Object(Composer\Plugin\PrePoolCreateEvent))
#3 phar:///usr/local/bin/composer/src/Composer/DependencyResolver/PoolBuilder.php(236): Composer\EventDispatcher\EventDispatcher->dispatch('pre-pool-create', Object(Composer\Plugin\PrePoolCreateEvent))
#4 phar:///usr/local/bin/composer/src/Composer/Repository/RepositorySet.php(233): Composer\DependencyResolver\PoolBuilder->buildPool(Array, Object(Composer\DependencyResolver\Request))
#5 ph in /Users/youplus/Public/nyuumon/vendor/symfony/flex/src/Flex.php on line 885

Fatal error: Uncaught Error: Call to undefined method Composer\DependencyResolver\Request::getFixedOrLockedPackages() in /Users/youplus/Public/nyuumon/vendor/symfony/flex/src/Flex.php:885
Stack trace:
#0 [internal function]: Symfony\Flex\Flex->truncatePackages(Object(Composer\Plugin\PrePoolCreateEvent))
#1 phar:///usr/local/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(170): call_user_func(Array, Object(Composer\Plugin\PrePoolCreateEvent))
#2 phar:///usr/local/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(91): Composer\EventDispatcher\EventDispatcher->doDispatch(Object(Composer\Plugin\PrePoolCreateEvent))
#3 phar:///usr/local/bin/composer/src/Composer/DependencyResolver/PoolBuilder.php(236): Composer\EventDispatcher\EventDispatcher->dispatch('pre-pool-create', Object(Composer\Plugin\PrePoolCreateEvent))
#4 phar:///usr/local/bin/composer/src/Composer/Repository/RepositorySet.php(233): Composer\DependencyResolver\PoolBuilder->buildPool(Array, Object(Composer\DependencyResolver\Request))
#5 ph in /Users/youplus/Public/nyuumon/vendor/symfony/flex/src/Flex.php on line 885

該当のソースコード

sudo mv composer.phar /usr/local/bin/composer/
chmod a+x /usr/local/bin/composer
composer global update
composer create-project symfony/website-skeleton nyuumon