Code Migration Tool - The lock file is not up to date
I have downloaded zip file from code migration tool github.
I ran composer install, but got an error:
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 You may be getting outdated dependencies.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.
- Installation request for magento/framework 100.0.12 -> satisfiable by magento/framework[100.0.12].
- magento/framework 100.0.12 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.9) does not satisfy that requirement.
I ran composer update and composer update --lock but it doesn't improve the situation.