diff --git a/m4/version.m4 b/m4/version.m4
index f9e538585a..24dc5ac26e 100644
--- a/m4/version.m4
+++ b/m4/version.m4
@@ -1,2 +1,2 @@
-m4_define([VERSION_NUMBER], [2.1.5])
+m4_define([VERSION_NUMBER], [2.1.6])
 m4_define([PCMK_URL], [https://ClusterLabs.org/pacemaker/])