Update README.md

Author: prototaxites

README.md

@@ -79,7 +79,7 @@ And then the `test/` directory was tarred to create `minigut_cat.tar.gz`.
 We have uploaded a copy of the official [GTDB-Tk mock database](https://data.gtdb.ecogenomic.org/releases/latest/auxillary_files/gtdbtk_package/mockup_db/) to this repository for use while testing mag and the nf-core GTDB modules - this significantly improves the run-time of tests as the GTDB server can be very slow. 
 
 The database is available as a gzipped tarball at:
-- (r232, latest) `databases/gtdbtk/gtdbtk_mockup_r232_20270507.tar.gz`
+- (r232, latest) `databases/gtdbtk/gtdbtk_mockup_r232_20260507.tar.gz`
 - (r226) `databases/gtdbtk/gtdbtk_mockup_20250422.tar.gz`
 
 ### GUNC