diff --git a/configure.ac b/configure.ac
index 889ad918..08b07ab4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,7 @@ dnl Require at least automake 2.52
 AC_PREREQ(2.52)
 
 dnl Initialize the automake stuff
-AM_INIT_AUTOMAKE(SimGear, 1.9.0)
+AM_INIT_AUTOMAKE(SimGear, 1.9.1)
 
 dnl Specify KAI C++ compiler and flags.
 dnl Borrowed with slight modification from blitz distribution.