diff --git a/changelog.txt b/changelog.txt
index f7aac164..819cb4a0 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -5445,3 +5445,13 @@ Bug fixes:
 - fixed the single-land mode on fractals
 - use two-letter labels instead of excessive primes in the fundamental domain display
 - fixed a bug with Cellular Automata crashing after map reloaded
+
+2025-05-26 09:17 Update 13.0z:
+Mostly bugfixes:
+- fixed some rock level rendering issues
+- fixed the rendering of explosive barrels (and crates)
+- fixed the bug with too large floors in pure Euclidean square
+- inventory icons: fixed the wrong size used, fixed the crash bug when rendering the hypersian rug in some settings
+- shmup: particle effects in shmup now appear from the correct locaton, fuel particles in space rocks
+- Racing official track no longer turns the "god mode" off
+- fixed the Yendor/Caribbean markers in some projections
diff --git a/hyper.h b/hyper.h
index 6990e8bf..175206cc 100644
--- a/hyper.h
+++ b/hyper.h
@@ -13,8 +13,8 @@
 #define _HYPER_H_
 
 // version numbers
-#define VER "13.0y"
-#define VERNUM_HEX 0xAA19
+#define VER "13.0z"
+#define VERNUM_HEX 0xAA1A
 
 #include "sysconfig.h"