diff --git a/NEWS.md b/NEWS.md
index 4ca3eb9..1a527b1 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,12 @@
 # Changes of mboxgrep
 
+## Changes in 0.7.13
+
+- Improve the readability of this file.
+- Failure to lock a file (mbox) is now a fatal error.
+- Fix Autoconf on Windows.
+- Code refactoring, mostly of mbox-related functions.
+
 ## Changes in 0.7.12a
 
 - Fix Automake macros to include the license file and others.
diff --git a/configure.ac b/configure.ac
index 7465a04..0d32785 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 #  mboxgrep - scan mailbox for messages matching a regular expression
-#  Copyright (C) 2000 - 2003, 2023  Daniel Spiljar
+#  Copyright (C) 2000 - 2003, 2023 - 2024  Daniel Spiljar
 #
 #  Mboxgrep is free software; you can redistribute it and/or modify it 
 #  under the terms of the GNU General Public License as published by
@@ -18,7 +18,7 @@
 # Process this file with autoconf to produce a configure script.
 
 # Yawn.
-AC_INIT([mboxgrep], [0.7.12a], [dspiljar@datatipp.se], [mboxgrep], [https://www.mboxgrep.org/])
+AC_INIT([mboxgrep], [0.7.13], [dspiljar@datatipp.se], [mboxgrep], [https://www.mboxgrep.org/])
 #AM_INIT_AUTOMAKE
 AM_INIT_AUTOMAKE([foreign])
 AC_LANG([C])
diff --git a/doc/mboxgrep.1 b/doc/mboxgrep.1
index 0599414..f9645df 100644
--- a/doc/mboxgrep.1
+++ b/doc/mboxgrep.1
@@ -10,7 +10,7 @@ mboxgrep \- displays email messages matching a pattern
 This manual page refers to
 .B mboxgrep
 version
-.BR 0.7.12a .
+.BR 0.7.13 .
 .PP
 .B mboxgrep
 scans a
diff --git a/doc/mboxgrep.info b/doc/mboxgrep.info
index 6f44401..bd81823 100644
Binary files a/doc/mboxgrep.info and b/doc/mboxgrep.info differ
diff --git a/doc/mboxgrep.texi b/doc/mboxgrep.texi
index 1e92ba0..62ec0ee 100644
--- a/doc/mboxgrep.texi
+++ b/doc/mboxgrep.texi
@@ -5,7 +5,7 @@
 @setchapternewpage odd
 
 @set EDITION 0.7
-@set VERSION 0.7.12a
+@set VERSION 0.7.13
 @set UPDATED 23 September 2024
 
 @dircategory Mail
diff --git a/src/mboxgrep.h b/src/mboxgrep.h
index af2bf75..98d5450 100644
--- a/src/mboxgrep.h
+++ b/src/mboxgrep.h
@@ -1,6 +1,6 @@
 /*
   mboxgrep - scan mailbox for messages matching a regular expression
-  Copyright (C) 2000 - 2003, 2006, 2023  Daniel Spiljar
+  Copyright (C) 2000 - 2003, 2006, 2023 - 2024 Daniel Spiljar
 
   Mboxgrep is free software; you can redistribute it and/or modify it 
   under the terms of the GNU General Public License as published by
@@ -21,8 +21,8 @@
 #define MBOXGREP_H
 
 #define APPNAME "mboxgrep"
-#define VERSION "0.7.12a"
-#define BUGREPORT_ADDR "dspiljar AT datatipp.se"
+#define VERSION "0.7.13"
+#define BUGREPORT_ADDR "dspiljar@datatipp.se"
 
 #define HOST_NAME_SIZE 256