diff --git a/changelog.txt b/changelog.txt
index 0882dc6d..d521675f 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -2678,3 +2678,24 @@ Vector graphics editor:
 * the editor now displays the area of the currently drawn shape
 * fixed angle measurement and grid display (it was supposed to measure angles relative to the previous grid center)
 
+2018.09.07 16:19 Update 10.4u
+
+* fixed some glitches in spherical projections
+
+Web demo:
+* greatly improved the efficiency
+* CUSTOM_CAPTION can be configured (used in pentagonal exploration)
+* better text on white background
+
+RogueViz:
+* draw legend if there are multiple edge types even if no standard legend is present
+* fixed help in RogueViz kohonen
+* load/save compressed data in RogueViz kohonen
+* vertex search feature in RogueViz
+* fixed some bugs with drawing edges
+* rogueviz:: greatly improved vertex help
+* fixed bugs with white background
+* open URLs from Emscripten
+* commandline option to rotate
+* Pentagonal Exploration added
+* fixed some bugs in the RogueViz Presentation
diff --git a/hyper.h b/hyper.h
index 6a43b837..9a07eaab 100644
--- a/hyper.h
+++ b/hyper.h
@@ -2,9 +2,9 @@
 // It is quite chaotic.
 
 // version numbers
-#define VER "10.4t"
-#define VERNUM 10420
-#define VERNUM_HEX 0xA0C4
+#define VER "10.4u"
+#define VERNUM 10421
+#define VERNUM_HEX 0xA0C5
 
 #include <stdarg.h>