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  <section id="upgrade-to-nextcloud-26">
<h1>Upgrade to Nextcloud 26<a class="headerlink" href="#upgrade-to-nextcloud-26" title="Link to this heading"></a></h1>
<section id="system-requirements">
<h2>System requirements<a class="headerlink" href="#system-requirements" title="Link to this heading"></a></h2>
<ul class="simple">
<li><p>PHP 8.2 is now supported, but 8.1 is recommended.</p></li>
<li><p>PHP 7.4 is no longer supported.</p></li>
</ul>
</section>
<section id="system-email">
<h2>System email<a class="headerlink" href="#system-email" title="Link to this heading"></a></h2>
<p>The software component to send system emails (notifications, invites, password reset, etc) had to be replaced. The new library should work without any changes out of the box for most setups.</p>
<p>A brief overview of changes:</p>
<ul class="simple">
<li><p>STARTTLS cannot be enforced. It will be used automatically if the mail server supports it. The encryption type should be set to ‘None/STARTTLS’ in this case.</p></li>
<li><p>Self signed certificates now need to be explicitly enabled, see <a class="reference internal" href="../configuration_server/email_configuration.html#tlspeerverification"><span class="std std-ref">this guide</span></a> for an example on how to configure this.</p></li>
<li><p>NTLM authentication for Microsoft Exchange is not supported by the new mailer library. Try using <a class="reference external" href="https://learn.microsoft.com/en-us/exchange/client-developer/exchange-web-services/authentication-and-ews-in-exchange#basic-authentication">basic authentication</a> instead.</p></li>
</ul>
<p>See for more information: <a class="reference internal" href="../configuration_server/email_configuration.html#email-smtp-config"><span class="std std-ref">Mail Providers</span></a>.</p>
</section>
<section id="dav-sync-tokens-retention">
<h2>DAV sync tokens retention<a class="headerlink" href="#dav-sync-tokens-retention" title="Link to this heading"></a></h2>
<p>A mechanism to clean up old CalDAV and CardDAV sync tokens has been added. See <a class="reference internal" href="../groupware/calendar.html#caldav-data-retention"><span class="std std-ref">CalDAV retention</span></a> and <a class="reference internal" href="../groupware/contacts.html#carddav-data-retention"><span class="std std-ref">CardDAV retention</span></a> and make sure it fits your installation size.</p>
</section>
<section id="web-server-configuration">
<h2>Web server configuration<a class="headerlink" href="#web-server-configuration" title="Link to this heading"></a></h2>
<ul class="simple">
<li><p>The recommended <a class="reference internal" href="../installation/nginx.html#nginx-config"><span class="std std-ref">nginx configuration</span></a> changed.</p></li>
</ul>
</section>
</section>

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