Компосер не устанавливает vendor

[FOMINTIMUR]

Всем доброго дня! Никак не могу понять проблему. Почему он не хочет ставить расширения.
composer install
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Warning: The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. Run update to update them.
Your requirements could not be resolved to an installable set of packages.

Problem 1
- Installation request for yiisoft/yii2-composer 2.0.3 -> satisfiable by yiisoft/yii2-composer[2.0.3].
- yiisoft/yii2-composer 2.0.3 requires composer-plugin-api 1.0.0 -> no matching package found.
Problem 2
- yiisoft/yii2-composer 2.0.3 requires composer-plugin-api 1.0.0 -> no matching package found.
- yiisoft/yii2 2.0.3 requires yiisoft/yii2-composer * -> satisfiable by yiisoft/yii2-composer[2.0.3].
- Installation request for yiisoft/yii2 2.0.3 -> satisfiable by yiisoft/yii2[2.0.3].

Potential causes:
- A typo in the package name
- The package is not available in a stable-enough version according to your minimum-stability setting
see <https://getcomposer.org/doc/04-schema.m ... -stability> for more details.
- It's a private package and you forgot to add a custom repository to find it

Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

[andku83]

или обновление yii до актуальной версии (что может поломать приложение),
либо https://yiiframework.ru/forum/viewtopic ... in#p226187