diff --git a/configure.ac b/configure.ac
index d3c3d4c..4ba41a8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([rpn], [2.0], [louis@rubet.fr],
+AC_INIT([rpn], [2.1], [louis@rubet.fr],
              [rpn], [http://www.rubet.fr/])
 AC_PREREQ([2.59])
 AM_INIT_AUTOMAKE([1.10 -Wall no-define])
diff --git a/src/version.h b/src/version.h
index 158caf4..d3183a1 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1,5 +1,5 @@
 // version and soft name
-static const char version[] = "2.0";
+static const char version[] = "2.1-RC1";
 static const char uname[] =
     "rpn v2.0, (c) 2017 <louis@rubet.fr>, GNU LGPL v3";