diff --git a/SWIG/configure.in b/SWIG/configure.in
index 1fea074ea..bb8f55df4 100644
--- a/SWIG/configure.in
+++ b/SWIG/configure.in
@@ -2,7 +2,7 @@ dnl Process this file with autoconf to produce a configure script.
 dnl The macros which aren't shipped with the autotools are stored in the 
 dnl Tools/config directory in .m4 files.
 
-AC_INIT([swig],[1.3.20],[http://www.swig.org])
+AC_INIT([swig],[1.3.21],[http://www.swig.org])
 AC_PREREQ(2.54)
 AC_CONFIG_SRCDIR([Source/Swig/swig.h])
 AC_CONFIG_AUX_DIR([Tools/config])