diff --git a/configure.ac b/configure.ac
index 7619d4c784718b5f2761825343d983b643db0bd8..13d1baf126815506b21f411ce80e46dc1a4f4460 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ([2.69])
-AC_INIT([aribb24], [0.0.1], [nkoriyama@gmail.com])
+AC_INIT([aribb24], [1.0.0], [nkoriyama@gmail.com])
 AM_INIT_AUTOMAKE([foreign subdir-objects])
 AC_CONFIG_MACRO_DIR([m4])