how to update fireapp builder version ?

Fireapp builder uses older version of leanback i.e "com.android.support:leanback-v17:23.1.1". I need to make customised design that needs leanback updated library i.e "com.android.support:leanback-v17:28.0.0" because this library has the classes that i need to use in my code. I need to know how do i update the library

The issue identifies Fire App Builder and the leanback dependency versions but names no build file or test. Start by locating the project’s dependency declaration for com.android.support:leanback-v17 and reviewing how its Android build is configured. Done means documenting a supported way to update the library and confirming that the project still builds.

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