diff --git a/changelog.txt b/changelog.txt
index 3cd8fd13..acf0eafe 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -4953,3 +4953,8 @@ Other fixes:
 - Swap the Red Troll's hair & fur colors (thanks to @jlmjlm)
 - Experimental fractal geometries (experiment with geometry -> Euclidean)
 - fixed Terracotta in Euclidean disk
+
+2023-03-29 09:10 Update 12.1o:
+- fixed the orientation in the hat tiling
+- fixed bugs when regenerating a map in the hat tiling + embedding
+- fixed variation not showing in some geometries
diff --git a/hyper.h b/hyper.h
index 5a6849b2..35fbfd06 100644
--- a/hyper.h
+++ b/hyper.h
@@ -13,8 +13,8 @@
 #define _HYPER_H_
 
 // version numbers
-#define VER "12.1n"
-#define VERNUM_HEX 0xA92E
+#define VER "12.1o"
+#define VERNUM_HEX 0xA92F
 
 #include "sysconfig.h"