diff --git a/ChangeLog b/ChangeLog
index 6ababeed7..75524f0a4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,6 @@
 2010-06-12 Holger Vogt
  * /visualc/include/config.h: update to version 21
+   configure.in: version 21
  
 2010-06-11 Holger Vogt
  * DEVICES: update 4.6.5
diff --git a/configure.in b/configure.in
index db573e89e..cc60e004d 100644
--- a/configure.in
+++ b/configure.in
@@ -12,7 +12,7 @@ dnl Initialisation
 dnl ---------------
 
 dnl Initialisation of configure
-AC_INIT(ngspice,20plus,ngspice-bugs@lists.sourceforge.net)
+AC_INIT(ngspice,21,ngspice-bugs@lists.sourceforge.net)
 
 dnl Unique file in the source directory
 AC_CONFIG_SRCDIR([src/ngspice.c])