Error guzzlehttp/guzzle ^6.3 -> no matching package found when update from 8.7.9 to 8.8.1

Question

When i tried to update my project using composer from 8.7.9 to 8.8.1 i get the following error:

Command:

composer update drupal/core --with-dependencies

[Composer\DependencyResolver\SolverProblemsException] Problem 1 - Installation request for drupal/core 8.8.1 -> satisfiable by drupal/core[8.8.1].
- drupal/core 8.8.1 requires guzzlehttp/guzzle ^6.3 -> no matching package found. Problem 2 .
- drupal/core 8.8.1 requires guzzlehttp/guzzle ^6.3 -> no matching package found.
- drupal/ultimate_cron 2.x-dev requires drupal/core ^8.5 -> satisfiable by drupal/core[8.8.1].
- Installation request for drupal/ultimate_cron ^2.0 -> satisfiable by drupal/ultimate_cron[2.x-dev].

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.md#minimum-stability for more details.
- It's a private package and you forgot to add a custom repository to find it

Any ideas ?

Answer 1

I have just to remove the vendor Folder it works now:
For the complete steps see 8.5.6 Update not being recognized .