diff --git a/ChangeLog b/ChangeLog
index 2b4d3c7d..215cb991 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,5 @@
+26/3/15 started 7.42.4
+
 6/2/15 started 7.42.3
 - bump version for back-compat ABI change
 - added vips_image_memory(), an alias for vips_image_new_memory()
diff --git a/configure.ac b/configure.ac
index 01ca4928..a5e6a70f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 
 # also update the version number in the m4 macros below
 
-AC_INIT([vips], [7.42.3], [vipsip@jiscmail.ac.uk])
+AC_INIT([vips], [7.42.4], [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], [7])
 m4_define([vips_minor_version], [42])
-m4_define([vips_micro_version], [3])
+m4_define([vips_micro_version], [4])
 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=41
-LIBRARY_REVISION=0
+LIBRARY_REVISION=1
 LIBRARY_AGE=1
 
 # patched into include/vips/version.h