diff --git a/configure.ac b/configure.ac
index c8cf40d1..1178847a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -164,7 +164,7 @@ AC_SUBST(XAPIAN_LIBS)
 # note that MU_STORE_SCHEMA_VERSION does not necessarily follow MU
 # versioning, as we hopefully don't have updates for each version;
 # also, this has nothing to do with Xapian's software version
-AC_DEFINE(MU_STORE_SCHEMA_VERSION,["9.8"], ['Schema' version of the database])
+AC_DEFINE(MU_STORE_SCHEMA_VERSION,["9.9"], ['Schema' version of the database])
 ###############################################################################