Gem::LoadError: Specified 'sqlite3' for database adapter, but the gem is not loaded

Question

I\'m trying to push my app to heroku but am getting this message.

Gem::LoadError: Specified \'sqlite3\' for database adaptor, but the gem is not loaded.
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Answer 1

I had to specify my sqlite3 version as 1.3.13:

gem 'sqlite3', '~> 1.3.13'

Then run bundle update.