Marcel Taeumel uploaded a new version of ReleaseBuilder to project The Trunk:
http://source.squeak.org/trunk/ReleaseBuilder-mt.208.mcz

==================== Summary ====================

Name: ReleaseBuilder-mt.208
Author: mt
Time: 3 March 2020, 12:28:11.466812 pm
UUID: 8e130da6-cb1a-b14e-8627-ef0e7a587926
Ancestors: ReleaseBuilder-mt.207

Set release version 5.3. (This MC version will be copied to the release repo.)

=============== Diff against ReleaseBuilder-mt.207 ===============

Item was changed:
  ----- Method: ReleaseBuilder class>>initialize (in category 'class initialization') -----
  initialize
  
  	QAndA ifNil: [self clearQAndA].
  
  	"We have to be after AutoStart so that Morphic is up and running."
  	Smalltalk addToStartUpList: ReleaseBuilder after: AutoStart.
  
+ 	SystemVersion newVersion: 'Squeak5.3'!
- 	SystemVersion newVersion: 'Squeak5.3rc3'!