diff --git a/configure.ac b/configure.ac
index 7e08db5a8edadc90d40b24ccda5c21851222df60..624706faa5b05a31dbf822b00e9d3b5f4081063b 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, 12)
+m4_define(graph_tool_version_micro, 13)
 
 AC_INIT([graph-tool],[graph_tool_version_major().graph_tool_version_minor().graph_tool_version_micro()],[http://graph-tool.skewed.de])