diff --git a/changelog.txt b/changelog.txt
index b608a2c3..86da338f 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -4979,3 +4979,12 @@ Mostly embedding-related improvements:
 - fixed stereo_alpha in some geometries
 - fixed the combinations of Archimedean, fake, and embedding
 - "pipes" (fat grid lines) for anisotropic geometries
+
+2023-08-16 09:32 Update 12.1s
+- Most angles are now specified using a special dialog (rather than degrees, or a bunch of degree values in the 3D case). This is more powerful (more intuitive in 3D cases; 3D rotations like 'camera angle' and '3D model rotation' became 3D).
+- Fixes to how hyperboloid/hemisphere/ball models are rendered
+- Minor improvements to the number dialogs (immediately visible effects, etc.) and parameter (animation formulas allowed in more places)
+- Fixed centering in multiplayer
+- Fixed a bug which caused the screen to disappear on switch-to-fpp
+- Fixed the movement in Nil geometry
+- Fixed a crash when changing sight range while in rug
diff --git a/hyper.h b/hyper.h
index d71c335f..70754a32 100644
--- a/hyper.h
+++ b/hyper.h
@@ -13,8 +13,8 @@
 #define _HYPER_H_
 
 // version numbers
-#define VER "12.1r"
-#define VERNUM_HEX 0xA932
+#define VER "12.1s"
+#define VERNUM_HEX 0xA933
 
 #include "sysconfig.h"