diff --git a/configure.ac b/configure.ac
index 2cfc140..e8aaf07 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@ AC_INIT
 AC_CANONICAL_TARGET([])
 
 AC_CONFIG_AUX_DIR([.])
-AS_VERSION(comedilib, COMEDILIB, 0, 7, 20, 1)
+AS_VERSION(comedilib, COMEDILIB, 0, 7, 21)
 #COMEDILIB_DEBUG="-Wall -Werror"
 COMEDILIB_DEBUG="-Wall"
 AM_INIT_AUTOMAKE($PACKAGE,$VERSION)