This is a [frequently asked question at the Library of Congress][1]:

> If a bill from any Congress does not become law during the Congress in which it is introduced, it is considered “dead.”  For a “dead” bill to be enacted in a new Congress, it would have to be reintroduced with a new number and begin anew its journey through the legislative process.


  [1]: https://ask.loc.gov/law/faq/334496?loclr=bloglaw