Congrats on the new release. We updated our Docker image to match:
$ docker run -it weinholt/chicken CHICKEN (c) 2008-2020, The CHICKEN Team (c) 2000-2007, Felix L. Winkelmann Version 5.2.0 (rev 317468e4) There's now also a Chicken 4 image: $ docker run -it weinholt/chicken:4 CHICKEN (c) 2008-2017, The CHICKEN Team (c) 2000-2007, Felix L. Winkelmann Version 4.13.0 (rev 68eeaaef)
