diff --git a/configure.ac b/configure.ac
index ba06524f..d402a72e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,7 @@ dnl Require autoconf version >= 2.57
 AC_PREREQ(2.57)
 
 dnl ############# Initialisation
-AC_INIT([mpg123], [1.20.1], [mpg123-devel@lists.sourceforge.net])
+AC_INIT([mpg123], [1.21.0], [mpg123-devel@lists.sourceforge.net])
 dnl Increment API_VERSION when the API gets changes (new functions).
 API_VERSION=40
 LIB_PATCHLEVEL=3