diff --git a/code/ulab.c b/code/ulab.c
index 948d621f..66582693 100644
--- a/code/ulab.c
+++ b/code/ulab.c
@@ -33,7 +33,7 @@
 #include "user/user.h"
 #include "utils/utils.h"
 
-#define ULAB_VERSION 6.5.4
+#define ULAB_VERSION 6.5.5
 #define xstr(s) str(s)
 #define str(s) #s
 
diff --git a/docs/ulab-change-log.md b/docs/ulab-change-log.md
index 90b86307..4600c7c4 100644
--- a/docs/ulab-change-log.md
+++ b/docs/ulab-change-log.md
@@ -1,5 +1,11 @@
 Sat, 14 Sep 2024
 
+version 6.5.5
+
+    add scratchpad, out, log keyword arguments to spectrum
+
+Sat, 14 Sep 2024
+
 version 6.5.4
 
     fix roll, when shift is 0