Deployment error with Laravel App on Heroku - php

Question

I am getting the below error when trying to deploy my Laravel app to heroku. Has anyone experienced this error before?
Running 'composer compile'...
remote: > #php -dphar.readonly=0 bin/compile
remote: Could not open input file: bin/compile
remote: Script #php -dphar.readonly=0 bin/compile handling the compile event returned with error code 1
remote:
remote: ! ERROR: Compile step failed!
remote: !
remote: ! Installation of dependencies was successful, but the custom
remote: ! script you're using to perform actions after 'composer install'
remote: ! failed with the error above.
remote: !
remote: ! Check that the 'compile' command(s) in the 'scripts' section of
remote: ! your 'composer.json' are working properly and not running into
remote: ! timeouts or memory limits.
remote: !
remote: ! For more information on the 'composer compile' step, refer to
remote: ! https://devcenter.heroku.com/articles/php-support
remote: !
remote: ! REMINDER: the following warnings were emitted during the build;
remote: ! check the details above, as they may be related to this error:
remote: ! - Your 'composer.lock' is out of date!
remote:
remote: ! Push rejected, failed to compile PHP app.
Compile Script:
"scripts": {
"compile": "#php -dphar.readonly=0 bin/compile"
}