diff --git a/ChangeLog b/ChangeLog
index 9dd31c72..c29d425a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -187,5 +187,6 @@ https://github.com/olikraus/u8g2 ChangeLog
   * Added AVR specific optimization for 3-wire Software SPI (issue 586)
  2018-xx-xx	v2.23.xx  olikraus@gmail.com
   * NEW FONT FORMAT for speedup of the unicode font section (issue 596)  
+  * Fixed a bug in the font construction for monospaced fonts (issue 669) 
   
   
diff --git a/tools/release/print_release.sh b/tools/release/print_release.sh
index 60aa8130..c6b535c8 100755
--- a/tools/release/print_release.sh
+++ b/tools/release/print_release.sh
@@ -1,2 +1,2 @@
 # without 'v' prefix
-echo -n "2.23.12"
+echo -n "2.23.13"