bump version number
diff --git a/debian/changelog b/debian/changelog
index 147c4b4..df7e693 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+thrift (0.21.0) stable; urgency=low
+
+  * update to 0.21.0
+
+ -- Apache Thrift Developers <dev@thrift.apache.org>  Mon, 02 Sep 2024 23:30:00 +0100
+
 thrift (0.20.0) stable; urgency=low
 
   * update to 0.20.0