diff --git a/configure.ac b/configure.ac
index 0ad93293..58693f90 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_INIT([spin], [0.2.0])
+AC_INIT([spin], [0.5.0])
 AC_PREREQ([2.50])
 AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE([-Wall foreign tar-pax no-dist-gzip dist-bzip2 1.10b subdir-objects])