diff --git a/chapter01/changelog.xml b/chapter01/changelog.xml
index 6099ffc0b..c4f01eb47 100644
--- a/chapter01/changelog.xml
+++ b/chapter01/changelog.xml
@@ -39,6 +39,9 @@
     <listitem>
       <para>2006-07-31</para>
       <itemizedlist>
+        <listitem>
+          <para>[matthew] - Upgrade to bison-2.3.</para>
+        </listitem>
         <listitem>
           <para>[matthew] - Upgrade to binutils-2.17.</para>
         </listitem>
diff --git a/chapter01/whatsnew.xml b/chapter01/whatsnew.xml
index 275c5f216..836c8e8ae 100644
--- a/chapter01/whatsnew.xml
+++ b/chapter01/whatsnew.xml
@@ -37,9 +37,9 @@
     <listitem>
       <para>Binutils &binutils-version;</para>
     </listitem>
-    <!--<listitem>
+    <listitem>
       <para>Bison &bison-version;</para>
-    </listitem>-->
+    </listitem>
     <!--<listitem>
       <para>Bzip2 &bzip2-version;</para>
     </listitem>-->
diff --git a/packages.ent b/packages.ent
index 422a7ab43..f04224ffe 100644
--- a/packages.ent
+++ b/packages.ent
@@ -50,17 +50,17 @@
 <!ENTITY binutils-ch6-du "186 MB testsuite included">
 <!ENTITY binutils-ch6-sbu "1.7 SBU testsuite included">
 
-<!ENTITY bison-version "2.2">
-<!ENTITY bison-size "1,052 KB">
+<!ENTITY bison-version "2.3">
+<!ENTITY bison-size "1,055 KB">
 <!ENTITY bison-url "&gnu;bison/bison-&bison-version;.tar.bz2">
-<!ENTITY bison-md5 "e345a5d021db850f06ce49eba78af027">
+<!ENTITY bison-md5 "c18640c6ec31a169d351e3117ecce3ec">
 <!ENTITY bison-home "&gnu-software;bison/">
 <!--
 <!ENTITY bison-ch5-du "">
 <!ENTITY bison-ch5-sbu "">
 -->
-<!ENTITY bison-ch6-du "11.9 MB">
-<!ENTITY bison-ch6-sbu "0.6 SBU">
+<!ENTITY bison-ch6-du "12.3 MB">
+<!ENTITY bison-ch6-sbu "0.2 SBU">
 
 <!ENTITY bzip2-version "1.0.3">
 <!ENTITY bzip2-size "654 KB">