diff --git a/configure.ac b/configure.ac
index 336ccd06..d66a9788 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@ License along with this program.  If not, see
 ]])
 
 AC_PREREQ(2.52)
-AC_INIT([fibers], [0.5.0])
+AC_INIT([fibers], [1.0.0])
 AC_CONFIG_SRCDIR([env.in])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIRS([m4])