This is a patch release which fixes a Python error in the replication command when used with update intervals larger than an hour.
The release also includes some minor improvements to the search query parsing algorithm and fixes an issue with special characters in the ICU tokenizer normalization.
All users of Nominatim 4.0.0 are encouraged to update to this latest version. No special provisions are required. Simply build and install this latest release. Users of older versions, please refer to the Migration documentation for upgrade instructions.