diff --git a/configure.ac b/configure.ac
index d703f55ce531d2c046139c89873f8d9144853a8f..dc99e9bdb0f332c1c7d0759da24c6188c93ab1a5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@ dnl Process this file with autoconf to produce a configure script.
 dnl graph-tool package version number
 m4_define(graph_tool_version_major, 2)
 m4_define(graph_tool_version_minor, 2)
-m4_define(graph_tool_version_micro, 23)
+m4_define(graph_tool_version_micro, 24dev)
 
 AC_INIT([graph-tool],[graph_tool_version_major().graph_tool_version_minor().graph_tool_version_micro()],[http://graph-tool.skewed.de])