PHPUnit v10 depends on sebastian/diff v5 which is not supported by Drupal core.

So, no way to install PHPUnit 10 on Drupal site.

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Chi created an issue. See original summary.

chi’s picture

chi commented
Related issues: +#3217904: [meta] Support PHPUnit 10 in Drupal 11
cilefen’s picture

cilefen commented

Is this issue necessary as a separate effort to the meta issue?

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chi commented
Status: Active » Closed (duplicate)
Related issues: +#3299678: Deprecate DiffEngine and replace with sebastian/diff

Technically this issue has nothing to do with PHPUnit. Drupal added "sebastian/diff" package to replace own diff engine. #3299678: Deprecate DiffEngine and replace with sebastian/diff.

However, given that PHPUnit 9 depends on "sebastian/diff" v4 there is no way to update this package before #3217904: [meta] Support PHPUnit 10 in Drupal 11 landed.
Closing as duplicate.