diff --git a/configure.ac b/configure.ac
index 52fe2db6d8..ab071c9f56 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@ AC_PREREQ([2.69])
 dnl Don't forget to push a corresponding tag when updating any of _CLIENT_VERSION_* numbers
 define(_CLIENT_VERSION_MAJOR, 21)
 define(_CLIENT_VERSION_MINOR, 1)
-define(_CLIENT_VERSION_BUILD, 0)
+define(_CLIENT_VERSION_BUILD, 1)
 define(_CLIENT_VERSION_IS_RELEASE, true)
 define(_COPYRIGHT_YEAR, 2024)
 define(_COPYRIGHT_HOLDERS,[The %s developers])