We don't have synonyms for modernises yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are modernized, modernist and modernize.
(v) :
Non-Oxford British English standard spelling of modernize. [(transitive) To make (something old or outdated) up to date, or modern in style or function by adding or changing equipment, designs, etc.]
(v) :
Non-Oxford British English standard spelling of modernize. [(transitive) To make (something old or outdated) up to date, or modern in style or function by adding or changing equipment, designs, etc.]