Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires cdek-it/sdk2.0 ^0.1.5 -> satisfiable by cdek-it/sdk2.0[0.1.5].
- cdek-it/sdk2.0 0.1.5 requires jms/serializer ^1.14.0 -> found jms/serializer[1.14.0, 1.14.1] but the package is fixed to 3.12.3 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.
Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.
Installation failed, reverting ./composer.json and ./composer.lock to their original content.