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<concept id="document-history">
  <title>NetScaler SDX documentation history</title>
  <conbody>
    <p>The following table describes important changes to the NetScaler SDX appliance. To receive notifications about these updates, subscribe to the RSS feed.</p>
    <table frame="all" rowsep="1" colsep="1">
      <tgroup cols="3">
        <colspec colname="col1" colwidth="1*"/>
        <colspec colname="col2" colwidth="1*"/>
        <colspec colname="col3" colwidth="1*"/>
        <thead>
          <row>
            <entry>Date</entry>
            <entry>Change</entry>
            <entry>Description</entry>
          </row>
        </thead>
        <tbody>
          <row>
            <entry>17 May 2024</entry>
            <entry>NetScaler 13.1 build 53.17 is released. Refer to the release notes for a list of new features, fixed issues, and known issues.</entry>
            <entry>See <xref href="https://docs.netscaler.com/en-us/citrix-adc/13-1/citrix-adc-release-notes.html" scope="external" format="html">Release Notes</xref></entry>
          </row>
          <row>
            <entry>23 Oct 2023</entry>
            <entry>NetScaler 13.1 build 50.23 is released. Refer to the release notes for a list of new features, fixed issues, and known issues.</entry>
            <entry>See <xref href="https://stg-docs.netscaler.com/us/en/citrix-adc/13-1/citrix-adc-release-notes/release-notes-13-1-50-23.html" scope="external" format="html">Release Notes</xref></entry>
          </row>
          <row>
            <entry>09 Oct 2023</entry>
            <entry>Updated the supported upgrade paths for single bundle image.</entry>
            <entry>See <xref href="/en-us/sdx/13-1/single-bundle-upgrade.html#supported-upgrade-paths" format="markdown">Supported upgrade paths</xref></entry>
          </row>
          <row>
            <entry>12 Jun 2023</entry>
            <entry>Clarified upgrade path from 12.1 to 13.0 and 13.1</entry>
            <entry>See <xref href="/en-us/sdx/13-1/single-bundle-upgrade.html" format="markdown">Single bundle upgrade</xref></entry>
          </row>
          <row>
            <entry>12 Jun 2023</entry>
            <entry>Added a link to the backup folder.</entry>
            <entry>See <xref href="/en-us/sdx/13-1/configuring-management-service/backup-restore.html" format="markdown">Back up and restore the configuration data of the SDX appliance</xref></entry>
          </row>
          <row>
            <entry>12 Jun 2023</entry>
            <entry>Added a note about an extra CPU assigned for management when a dedicated core is assigned to a VPX instance.</entry>
            <entry>See <xref href="/en-us/sdx/13-1/provision-netscaler-instances.html" format="markdown">Provision NetScaler instances</xref></entry>
          </row>
          <row>
            <entry>02 Mar 2023</entry>
            <entry>Added an entry for SDX 16000 to the ACU to PKE resource conversion table</entry>
            <entry>See <xref href="/en-us/sdx/13-1/crypto-management.html#acu-to-pke-resource-conversion-table" format="markdown">Manage crypto capacity</xref></entry>
          </row>
          <row>
            <entry>18 Sep 2021</entry>
            <entry>NetScaler 13.1 build 4.43 is released. Refer to the release notes for a list of new features, fixed issues, and known issues.</entry>
            <entry>See <xref href="https://stg-docs.netscaler.com/us/en/citrix-adc/current-release/citrix-adc-release-notes/release-notes-13-1-4-43.html" scope="external" format="html">Release Notes</xref></entry>
          </row>
        </tbody>
      </tgroup>
    </table>
  </conbody>
</concept>
