This is bug-fix release. The main user-visible changes is that npdim= option of dynesty is removed. Also because of the code change, you will not be able to resume previous dynesty runs from earlier (<2.1.3) dynesty versions. Detailed changelog is below: Get rid of npdim option that at some point may have allowed the prior transformation to return higher dimensional vector than the inputs. Note that due to this change, restoring the checkpoint from previous version of the dynesty won't be possible) (issues #456, #457) (original issue reported by @MichaelDAlbrow, fixed by @segasai ) Fixed Fix the way the additional arguments are treated when working with dynesty's pool. Previously those only could have been passed through dynesty.pool.Pool() constructor. Now they can still be provided directly to the sampler (not recommended) ( #464 , reported by @eteq, fixed by @segasai ) change the .ptp() method to np.ptp() function as it is deprecated in numpy 2.0 ( #478 , reported and patched by @joezuntz) Fix an error if you use run_nested() several times (i.e. with maxiter option) while using blob=True. ( #475 , reported by @carlosRmelo)