For everyone who is panicking about this - to be affected, you either need to use a really old version of tzinfo (0.3.60 and earlier), have the tzinfo-data gem

For everyone who is panicking about this - to be affected, you either need to use a really old version of tzinfo (0.3.60 and earlier), have the tzinfo-data gem installed, or explicitly set TZInfo::DataSource to DataSources::RubyDataSource. Otherwise, by default, tzinfo will use TZInfo::ZoneinfoDataSource, which does not seem to be affected. https://github.com/tzinfo/tzinfo/blob/d9b289e1be30d29a2cb23bbfb6f4124a2692fd6d/lib/tzinfo/data_source.rb#L145 https://github.com/tzinfo/tzinfo/blob/d9b289e1be30d29a2cb23b... https://github.com/tzinfo/tzinfo/commit/b98c32efd61289fe6f00a50ab8061e95962ea983 https://github.com/tzinfo/tzinfo/commit/b98c32efd61289fe6f00...