diff --git a/chapter01/changelog.xml b/chapter01/changelog.xml
index e55400c02..f69da3985 100644
--- a/chapter01/changelog.xml
+++ b/chapter01/changelog.xml
@@ -40,6 +40,10 @@
     <listitem>
       <para>2009-05-10</para>
       <itemizedlist>
+        <listitem>
+          <para>[matthew] - Upgrade to M4-1.4.13. Fixes
+          <ulink url="&lfs-ticket-root;2377">#2377</ulink>.</para>
+        </listitem>
         <listitem>
           <para>[matthew] - Upgrade to Linux-2.6.29.3. Fixes
           <ulink url="&lfs-ticket-root;2374">#2374</ulink>.</para>
diff --git a/chapter01/whatsnew.xml b/chapter01/whatsnew.xml
index afa340797..ece843949 100644
--- a/chapter01/whatsnew.xml
+++ b/chapter01/whatsnew.xml
@@ -119,9 +119,9 @@
     <listitem>
       <para>Linux &linux-version;</para>
     </listitem>
-    <!--<listitem>
+    <listitem>
       <para>M4 &m4-version;</para>
-    </listitem>-->
+    </listitem>
     <!--<listitem>
       <para>Make &make-version;</para>
     </listitem>-->
diff --git a/packages.ent b/packages.ent
index 722f2da1a..4e75b34c9 100644
--- a/packages.ent
+++ b/packages.ent
@@ -321,10 +321,10 @@
 <!ENTITY linux-headers-ch6-du "341 MB">
 <!ENTITY linux-headers-ch6-sbu "0.1 SBU">
 
-<!ENTITY m4-version "1.4.12">
-<!ENTITY m4-size "879 KB">
+<!ENTITY m4-version "1.4.13">
+<!ENTITY m4-size "985 KB">
 <!ENTITY m4-url "&gnu;m4/m4-&m4-version;.tar.bz2">
-<!ENTITY m4-md5 "b3587c993523dd320c318ec456876839">
+<!ENTITY m4-md5 "28f9ccd3ac4da45409251008b911d677">
 <!ENTITY m4-home "&gnu-software;m4/">
 <!ENTITY m4-ch5-du "10 MB">
 <!ENTITY m4-ch5-sbu "0.2 SBU">