diff --git a/configure.ac b/configure.ac
index da631a6655cd51a651069ede7ec55f1f869630aa..e209ddd4c3177a17539dd340900e5018ecafd6ac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@ dnl An odd micro number indicates in-progress development.
 dnl An even micro number indicates a released version.
 m4_define(graph_tool_version_major, 2)
 m4_define(graph_tool_version_minor, 2)
-m4_define(graph_tool_version_micro, 6dev)
+m4_define(graph_tool_version_micro, 6)
 
 AC_INIT([graph-tool],[graph_tool_version_major().graph_tool_version_minor().graph_tool_version_micro()],[http://graph-tool.forked.de])