diff --git a/ChangeLog b/ChangeLog
index 0ebb3a53..3a21991d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,9 +4,12 @@
 - add vips_resize()
 
 21/8/14 started 7.40.7
-- fix matlab load
+- width and height were swapped in matlab load
+- set interpretation more carefully on matlab load
 - fix memleak in tilecache [Lovell]
 - fix memleak in VipsArray [Lovell]
+- fix memleak in webp load from buffer [Lovell]
+- fix memleak in png save to buffer [Lovell]
 
 12/8/14 started 7.40.6
 - more doc fixes
diff --git a/libvips/foreign/pngsave.c b/libvips/foreign/pngsave.c
index 6bacf39d..50465ac8 100644
--- a/libvips/foreign/pngsave.c
+++ b/libvips/foreign/pngsave.c
@@ -211,6 +211,8 @@ vips_foreign_save_png_buffer_build( VipsObject *object )
 
 	g_object_set( object, "buffer", area, NULL );
 
+	vips_area_unref( area );
+
 	return( 0 );
 }
 
diff --git a/libvips/foreign/webp2vips.c b/libvips/foreign/webp2vips.c
index 5fde4622..1975df42 100644
--- a/libvips/foreign/webp2vips.c
+++ b/libvips/foreign/webp2vips.c
@@ -298,6 +298,8 @@ vips__webp_read_buffer( void *buf, size_t len, VipsImage *out )
 	if( read_image( read, out ) )
 		return( -1 );
 
+	read_free( read );
+
 	return( 0 );
 }