Dear all, We are extending the submission deadline for the HoTT 2019 proceedings special issue of MSCS; the new deadline is *Friday 13 December*. Two notes for submitters: - If you already submitted for the original deadline but would like to use the extra time to revise your submission, let us know, and we will hold back from sending your submission out for refereeing for now. - There are problems with the MSCS LaTeX class file currently linked in the author instructions. Hopefully this should be fixed soon, but for now, don’t worry about putting submissions into the journal style — this can be done later after acceptance. Best wishes, –Peter and Dan. Original CfP: Submissions are now open for a special issue of Mathematical Structures in Computer Science on the proceedings of the HoTT 2019 conference, edited by Dan Licata and Peter LeFanu Lumsdaine. Papers on work presented at the HoTT19 conference are particularly encouraged, but the special issue is open to any work on homotopy type theory and related research areas. Specific topics include but are not limited to: homotopical and higher-categorical semantics of type theory; synthetic homotopy theory; applications of univalence and higher inductive types; cubical type theories and cubical models; formalization of mathematics and computer science in homotopy type theory / univalent foundations; and new type theories based on higher-dimensional ideas. To submit a paper, please follow the general MSCS submission procedure at https://www.cambridge.org/core/journals/mathematical-structures-in-computer-... . When giving the submission details, select “Homotopy Type Theory 2019” for the field “Special Issue”. More information at: - https://www.cambridge.org/core/news/homotopy-type-theory - https://www.cambridge.org/core/journals/mathematical-structures-in-computer-... - https://hott.github.io/HoTT-2019/ Best, Dan and Peter. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]