diff --git a/configure.ac b/configure.ac
index 10cf847a..a833f0ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 
 # also update the version number in the m4 macros below
 
-AC_INIT([vips], [8.5.6], [vipsip@jiscmail.ac.uk])
+AC_INIT([vips], [8.5.7], [vipsip@jiscmail.ac.uk])
 # required for gobject-introspection
 AC_PREREQ(2.62)
 
@@ -18,7 +18,7 @@ AC_CONFIG_MACRO_DIR([m4])
 # user-visible library versioning
 m4_define([vips_major_version], [8])
 m4_define([vips_minor_version], [5])
-m4_define([vips_micro_version], [6])
+m4_define([vips_micro_version], [7])
 m4_define([vips_version],
           [vips_major_version.vips_minor_version.vips_micro_version])
 
@@ -38,7 +38,7 @@ VIPS_VERSION_STRING=$VIPS_VERSION-`date`
 #   binary interface changes not backwards compatible?: reset age to 0
 
 LIBRARY_CURRENT=49
-LIBRARY_REVISION=5
+LIBRARY_REVISION=6
 LIBRARY_AGE=7
 
 # patched into include/vips/version.h