diff --git a/chapter01/changelog.xml b/chapter01/changelog.xml
index 6d361698b..b352bc26d 100644
--- a/chapter01/changelog.xml
+++ b/chapter01/changelog.xml
@@ -40,6 +40,16 @@
     appropriate for the entry or if needed the entire day's listitem.
     -->
 
+    <listitem>
+      <para>2024-03-29</para>
+      <itemizedlist>
+        <listitem>
+           <para>[bdubbs] - Revert to xz-5.4.6 due to uptream 
+           compromise.</para>
+        </listitem>
+      </itemizedlist>
+    </listitem>
+
     <listitem>
       <para>2024-04-25</para>
       <itemizedlist>
@@ -50,7 +60,6 @@
       </itemizedlist>
     </listitem>
 
-
     <listitem>
       <para>2024-03-19</para>
       <itemizedlist>
diff --git a/packages.ent b/packages.ent
index f20ad67a1..8d3a8890d 100644
--- a/packages.ent
+++ b/packages.ent
@@ -783,10 +783,10 @@
 <!ENTITY xml-parser-fin-du "2.4 MB">
 <!ENTITY xml-parser-fin-sbu "less than 0.1 SBU">
 
-<!ENTITY xz-version "5.6.1">
-<!ENTITY xz-size "1,738 KB">
+<!ENTITY xz-version "5.4.6">
+<!ENTITY xz-size "1,648 KB">
 <!ENTITY xz-url "https://github.com/tukaani-project/xz/releases/download/v&xz-version;/xz-&xz-version;.tar.xz">
-<!ENTITY xz-md5 "3ffbb426381c011dc9c986376d944ab7">
+<!ENTITY xz-md5 "7ade7bd1181a731328f875bec62a9377">
 <!ENTITY xz-home "https://tukaani.org/xz">
 <!ENTITY xz-tmp-du "22 MB">
 <!ENTITY xz-tmp-sbu "0.1 SBU">