diff --git a/changelog.md b/changelog.md
index 3234892..4c79b59 100644
--- a/changelog.md
+++ b/changelog.md
@@ -4,6 +4,9 @@
   * 2.4.x versions include bison version 2.7
   * 2.5.x versions include bison version 3.x
   
+### version 2.5.23
+  * upgrade win_bison to version 3.7.1
+
 ### version 2.5.22
   * upgrade win_bison to version 3.5.0