diff --git a/build.xml b/build.xml
index 7d3f525c..79ca9abc 100644
--- a/build.xml
+++ b/build.xml
@@ -54,7 +54,7 @@
   </pathconvert>
 
   <!-- Use the saxon in our lib folder. -->
-  <property name="ssSaxon" value="${ssBaseDir.converted}/lib/saxon-he-11.4.jar"/>
+  <property name="ssSaxon" value="${ssBaseDir.converted}/lib/saxon-he-12.5.jar"/>
   
   <!-- Use the closure compiler in our lib folder. -->
   <property name="ssClosure" value="${ssBaseDir.converted}/lib/closure-compiler.jar"/>
diff --git a/buildSchema.xml b/buildSchema.xml
index c04a9db2..e9fee361 100644
--- a/buildSchema.xml
+++ b/buildSchema.xml
@@ -81,7 +81,7 @@
     
     
     <!--Saxon-->
-    <property name="saxon" value="${lib.dir}/saxon-he-11.4.jar"/>
+    <property name="saxon" value="${lib.dir}/saxon-he-12.5.jar"/>
     
     <!--Condition set for the TEI server, since the TEI site can go down periodically:
   If we can reach the TEI guidelines-->
diff --git a/lib/lib/xmlresolver-4.4.3.jar b/lib/lib/xmlresolver-4.4.3.jar
deleted file mode 100644
index 366483d7..00000000
Binary files a/lib/lib/xmlresolver-4.4.3.jar and /dev/null differ
diff --git a/lib/lib/xmlresolver-4.4.3-data.jar b/lib/lib/xmlresolver-5.2.2-data.jar
similarity index 83%
rename from lib/lib/xmlresolver-4.4.3-data.jar
rename to lib/lib/xmlresolver-5.2.2-data.jar
index f2668cb9..ea0ca6ab 100644
Binary files a/lib/lib/xmlresolver-4.4.3-data.jar and b/lib/lib/xmlresolver-5.2.2-data.jar differ
diff --git a/lib/lib/xmlresolver-5.2.2.jar b/lib/lib/xmlresolver-5.2.2.jar
new file mode 100644
index 00000000..617149e5
Binary files /dev/null and b/lib/lib/xmlresolver-5.2.2.jar differ
diff --git a/lib/saxon-he-11.4.jar b/lib/saxon-he-11.4.jar
deleted file mode 100644
index 524f5b1b..00000000
Binary files a/lib/saxon-he-11.4.jar and /dev/null differ
diff --git a/lib/saxon-he-12.5.jar b/lib/saxon-he-12.5.jar
new file mode 100644
index 00000000..ca8d6c5d
Binary files /dev/null and b/lib/saxon-he-12.5.jar differ
diff --git a/lib/saxon_docs/index.html b/lib/saxon_docs/index.html
index 22a0ca5f..03fda793 100644
--- a/lib/saxon_docs/index.html
+++ b/lib/saxon_docs/index.html
@@ -40,21 +40,21 @@ <h1>Welcome to Saxon</h1>
                <h2>Online Documentation</h2>
                <p>Saxon documentation for the current release is available online:</p>
                <ul>
-                  <li><p><a href="https://www.saxonica.com/documentation11/"
-                           class="bodylink">Saxon 11 Documentation</a></p></li>
+                  <li><p><a href="https://www.saxonica.com/documentation12/"
+                           class="bodylink">Saxon 12 Documentation</a></p></li>
                </ul>
                <p>The above link is to an application implemented using SaxonJS (XSLT 3.0 in the
                   browser). For devices that do not have sufficient JavaScript capability to run
                   this application, an HTML version of the documentation is also available at <a
-                     href="https://www.saxonica.com/html/documentation11/documentation.html"
+                     href="https://www.saxonica.com/html/documentation12/documentation.html"
                      class="bodylink"
-                     >https://www.saxonica.com/html/documentation11/documentation.html</a>.</p>
+                     >https://www.saxonica.com/html/documentation12/documentation.html</a>.</p>
                <h2>Downloads</h2>
                <p>Saxon documentation, together with sample applications and drivers for the W3C
                   test suites can also be downloaded, from the <a
                      href="https://www.saxonica.com/download/download_page.xml" class="bodylink"
                      >Saxonica download page</a>. The same download file
-                     <code>saxon-resources-11.zip</code> covers all available Saxon editions (Saxon-HE,
+                     <code>saxon-resources-12.zip</code> covers all available Saxon editions (Saxon-HE,
                   Saxon-PE and Saxon-EE), for the Java and .NET platforms.</p>
                <p>For bug reporting, and lists of known bugs, please visit <a class="bodylink"
                      href="https://saxonica.plan.io/">https://saxonica.plan.io/</a></p>
@@ -64,7 +64,7 @@ <h2>Downloads</h2>
                </ul>
             </div>
             <div id="footer">
-               <p>© 2022 Saxonica</p>
+               <p>© 2023 Saxonica</p>
             </div>
          </div>
       </div>