We are glad to announce that the 4th HSCR workshop has officially been endorsed by ISCA as a satellite event of Interspeech 2021 in Brno (https://www.interspeech2021.org/satellites). The Interspeech conference will be held subsequently from August 30 to September 3, 2021. The HSCR proceedings will be published in print and also stored electronically in the ISCA archive.