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The 4.3.0 release of simmer, the Discrete-Event Simulator for R, is on CRAN. Along with this update, we are very glad to announce that our homonymous paper finally appeared in the Journal of Statistical Software. Please, use the following reference for citations (see citation("simmer")):

• Ucar I, Smeets B, Azcorra A (2019). “simmer: Discrete-Event Simulation for R.” Journal of Statistical Software90(2), 1-30. doi: 10.18637/jss.v090.i02 (URL: https://doi.org/10.18637/jss.v090.i02).

It took quite a lot of work and time, but we are very proud of the final result. We would like to thank the editorial team for their hard work, with special thanks to the anonymous referee for their thorough reviews and valuable comments, and Norman Matloff for his advice and support. Last but not least, we are very grateful for all the discussion and fruitful ideas that our growing community provides via the simmer-devel mailing list and GitHub.

The new release bring us the ability to keep seized resources after reneging, as well as to define a range of arrival priorities that are allowed to access a resource’s queue if there is no room in the server. We moved a lot of activity usage examples that were scattered in a far too long vignette to the appropriate help pages, and of course there is the usual share of bug fixes. See below for a complete list of changes.

Special thanks to Tom Lawton for his contributions to this release, and to Benjamin Sawicki for his generous donation.

### New features

• Add ability to keep_seized resources after reneging (#204 addressing #200).
• Add ability to define a range of arrival priorities that are allowed to access a resource’s queue if there is no room in the server (#205 addressing #202).

### Minor changes and fixes:

• Drop R6 as a dependency (#193 addressing #190).
• Small fix in from and from_to + documentation update (75a9569).
• Move activity usage examples to help pages (#194).
• Fix shortest-queue selection policies (#196).
• Fix batch triggering (#203).
• Update JSS paper, CITATION, references and DOI.
Article originally published in Enchufa2.es: simmer 4.3.0 + JSS publication.