configure.ac: bump to version  for the  release
diff --git a/configure.ac b/configure.ac
index 97cbfe5..107c155 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 m4_define([weston_major_version], [1])
 m4_define([weston_minor_version], [9])
-m4_define([weston_micro_version], [90])
+m4_define([weston_micro_version], [91])
 m4_define([weston_version],
           [weston_major_version.weston_minor_version.weston_micro_version])
 
@@ -59,7 +59,7 @@
 
 AC_CHECK_FUNCS([mkostemp strchrnul initgroups posix_fallocate])
 
-COMPOSITOR_MODULES="wayland-server >= 1.9.90 pixman-1 >= 0.25.2"
+COMPOSITOR_MODULES="wayland-server >= 1.9.91 pixman-1 >= 0.25.2"
 
 AC_CONFIG_FILES([doc/doxygen/tools.doxygen doc/doxygen/tooldev.doxygen])
 
@@ -321,7 +321,7 @@
 
 PKG_CHECK_MODULES(CAIRO, [cairo])
 
-PKG_CHECK_MODULES(TEST_CLIENT, [wayland-client >= 1.9.90])
+PKG_CHECK_MODULES(TEST_CLIENT, [wayland-client >= 1.9.91])
 
 AC_ARG_ENABLE(simple-clients,
               AS_HELP_STRING([--disable-simple-clients],