diff --git a/upgrading-to-drupal-9/README.rst b/upgrading-to-drupal-9/README.rst
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+Upgrading to Drupal 9
+#####################
+
+https://www.oliverdavies.uk/talks/upgrading-your-site-drupal-9
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diff --git a/upgrading-to-drupal-9/main.style b/upgrading-to-drupal-9/main.style
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+pageSetup:
+ firstTemplate: coverPage
+ height: 18cm
+ margin-bottom: 0cm
+ margin-gutter: 0cm
+ margin-left: 0cm
+ margin-right: 0cm
+ margin-top: 0cm
+ size: null
+ spacing-footer: 2mm
+ spacing-header: 2mm
+ width: 32cm
+
+pageTemplates:
+ coverPage:
+ frames: []
+ [12%, 10%, 76%, 75%]
+ showFooter: false
+ showHeader: false
+
+ titlePage:
+ alignment: TA_CENTER
+ frames: []
+ [8%, 8%, 85%, 60%]
+ showFooter: true
+ showHeader: false
+
+ standardPage:
+ frames: []
+ [3%, 3%, 94%, 92%]
+ showFooter: true
+ showHeader: false
+
+ imagePage:
+ alignment: TA_CENTER
+ frames: []
+ [12%, 10%, 76%, 80%]
+ showFooter: true
+ showHeader: false
+
+linkColor: #24608a
+
+styles:
+ normal:
+ fontSize: 28
+ textColor: #383745
+
+ bodytext:
+ alignment: TA_LEFT
+
+ heading:
+ alignment: TA_CENTER
+ fontSize: 24
+ spaceAfter: 16
+ textColor: #24608a
+
+ heading1:
+ parent: heading
+ alignment: TA_LEFT
+
+ title:
+ fontSize: 250%
+ parent: heading
+
+ bullet-list:
+ commands: []
+ [LEFTPADDING, [0, 0], [1, -1], 10]
+ [RIGHTPADDING, [0, 0], [1, -1], 0]
+ [VALIGN, [0, 0], [-1, -1], TOP]
+ colWidths: ["20", null]
+ textColor: #aaaaaa
+
+ bullet-list-item:
+ spaceBefore: 14
+ spaceAfter: 0
+
+ titleslideinfo:
+ alignment: TA_CENTER
+ fontSize: 120%
+ parent: normal
+
+ footer:
+ alignment: TA_RIGHT
+ fontName: stdMono
+ fontSize: 18
+ textColor: #24608a
+ rightIndent: 16
+ spaceBefore: 0
+
+ literal:
+ backColor: #eeeeee
+ fontName: stdMono
+
+ code:
+ backColor: #eeeeee
+ borderWidth: 0
+ fontSize: 24
+ parent: literal
+ spaceBefore: 4
+
+ blockquote:
+ parent: normal
+ fontName: stdItalic
+
+ attribution:
+ parent: normal
+ textColor: #666666
+
+ smaller:
+ textColor: red
diff --git a/upgrading-to-drupal-9/slides.rst b/upgrading-to-drupal-9/slides.rst
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+.. footer:: @opdavies
+
+Upgrading to Drupal 9
+#####################
+
+|
+
+.. class:: titleslideinfo
+
+Oliver Davies, Inviqa
+
+.. raw:: pdf
+
+ PageBreak imagePage
+
+.. image:: images/10-years-tweet.png
+ :width: 22cm
+
+.. raw:: pdf
+
+ TextAnnotation "Recently, I passed 10 years working full-time with Drupal and PHP (I'd been working with it for a few years prior to this too)."
+ TextAnnotation "Worked with Drupal 6, 7, 8 and 9."
+ TextAnnotation "Worked on a number of D6 to D7, and D8 to D9 upgrades"
+
+ PageBreak standardPage
+
+The D7 release cycle
+====================
+
+* One long-running branch
+* Minor versions for bug fixes (7.73)
+* No big, new features
+* Long time for changes to get committed to core
+
+.. raw:: pdf
+
+ TextAnnotation "Before we get into the D9 stuff."
+ TextAnnotation "D7 and earlier..."
+
+The D8 release cycle
+====================
+
+* Semantic versioning for core
+* Minor release (new features) every 6 months
+* Patch release (bug fixes) every month
+* Multiple supported versions of core (8.8, 8.9, 9.0)
+
+.. raw:: pdf
+
+ TextAnnotation "Drupal 8 onwards..."
+ TextAnnotation "Minor release = new functionality"
+ TextAnnotation "Patch release = bug fixes"
+ TextAnnotation "Change from 'it will be ready when it's ready' (D7) to a fixed release cycle and schedule, and what makes it in time will be added."
+
+.. raw:: pdf
+
+ PageBreak imagePage
+
+.. image:: images/2019_minor_release_schedule.png
+ :width: 20cm
+
+.. raw:: pdf
+
+ PageBreak standardPage
+
+Drupal 8 vs Drupal 9
+====================
+
+* No new functionality
+* Deprecated code removed
+* PHP required version increased
+* Major versions of dependencies updated
+
+.. raw:: pdf
+
+ TextAnnotation "Different to previous major version updates"
+ TextAnnotation "Symfony upgraded from 3 to 4."
+
+Previous upgrade issues
+=======================
+
+* Lots of breaking changes
+* Core released, but contrib takes time to catch up
+
+.. raw:: pdf
+
+ TextAnnotation "Lots of breaking changes, large rebuilds and migrations"
+ TextAnnotation "6(?) months between D7 core and Views being released, prevents adoption"
+ TextAnnotation "Jeff Geerling blog post 'Did breaking backwards compatibility kill Drupal?'"
+
+Contrib improvements
+====================
+
+* Minimal code changes required
+* Single release can support multiple versions of core
+* Semantic versioning enabled for contrib projects
+
+.. raw:: pdf
+
+ TextAnnotation "Need to fix deprecation notices, and replace deprecated code with the suggested replacements"
+ TextAnnotation "Modules, themes and distributions can now work with multiple versions of Drupal core in the same release"
+ TextAnnotation "`core` key replaced with `core_version_requirement`"
+
+ PageBreak imagePage
+
+.. image:: images/multiple-versions.png
+ :width: 20cm
+
+|
+
+.. image:: images/semver.png
+ :width: 20cm
+
+.. raw:: pdf
+
+ PageBreak titlePage
+
+The difference is deprecated code
+==================================
+
+.. raw:: pdf
+
+ TextAnnotation "Code that has been replaced by newer code and marked to be removed."
+ TextAnnotation "Not removed immediately to keep backwards compatibility."
+ TextAnnotation "A backwards compatibility break would require a major version change rather than a minor one."
+
+ PageBreak standardPage
+
+Deprecation example
+===================
+
+.. code-block:: php
+ :startinline: true
+
+ function drupal_set_message($message = NULL, $type = 'status', $repeat = FALSE) {
+ @trigger_error('drupal_set_message() is deprecated in Drupal 8.5.0 and will
+ be removed before Drupal 9.0.0. Use \Drupal\Core\Messenger\MessengerInterface
+ ::addMessage() instead. See https://www.drupal.org/node/2774931',
+ E_USER_DEPRECATED);
+
+ $messenger = \Drupal::messenger();
+ if (isset($message)) {
+ $messenger->addMessage($message, $type, $repeat);
+ }
+ return $messenger->all();
+ }
+
+.. raw:: pdf
+
+ TextAnnotation "drupal_set_message has been replaced by a Messenger service, this should be used instead."
+ TextAnnotation "Works but triggers an error in 8.9, breaks in 9.0."
+ TextAnnotation "To ensure D9 compatibility, update all of the deprecated code."
+
+ PageBreak titlePage
+
+How do I find it?
+=================
+
+.. raw:: pdf
+
+ PageBreak standardPage
+
+Drupal Check
+============
+
+- Developed by Matt Glaman
+- "Built on PHPStan, this static analysis tool will check for correctness (e.g. using a class that doesn't exist), deprecation errors, and more."
+- https://github.com/mglaman/drupal-check
+
+.. raw:: pdf
+
+ PageBreak titlePage
+
+composer global require mglaman/drupal-check
+============================================
+
+drupal-check web/modules/custom
+===============================
+
+.. raw:: pdf
+
+ PageBreak imagePage
+
+.. image:: images/drupal-check-output.png
+ :width: 22cm
+
+.. raw:: pdf
+
+ PageBreak titlePage
+
+Upgrade Status module
+=====================
+
+.. raw:: pdf
+
+ PageBreak imagePage
+
+.. image:: images/drupal-check-upgrade-status-comparison.png
+ :width: 12cm
+
+.. raw:: pdf
+
+ PageBreak standardPage
+
+PHPUnit Bridge
+==============
+
+- Drupal 8 uses Symfony's PHPUnit Bridge
+- Includes a 'Deprecation Helper'
+- Displays deprecation notices in test output
+
+.. raw:: pdf
+
+ PageBreak imagePage
+
+.. image:: images/phpunit-deprecation.png
+ :width: 23cm
+
+.. raw:: pdf
+
+ PageBreak standardPage
+
+Fixing deprecations
+===================
+
+.. code-block:: diff
+
+ - drupal_set_message($text);
+ + Drupal::messenger()->addMessage($text);
+
+.. image:: images/logo-composer-transparent.png
+ :width: 10cm
+
+Composer
+========
+
+- Dependency management tool for PHP
+- My preferred way to manage Drupal codebases
+- composer.json lists your dependencies and version constraints
+- composer.lock stores the installed dependencies and versions
+- Separate packages for ``core-recommended``, ``core-dev`` and ``core-composer-scaffold``
+
+.. raw:: pdf
+
+ TextAnnotation "Used by the majority of PHP frameworks and projects (Symfony, Laravel, Drush, Drupal Console)."
+
+ PageBreak titlePage
+
+composer require drupal/admin_toolbar:^2.0
+==========================================
+
+composer install
+================
+
+composer update drupal/admin_toolbar
+====================================
+
+Always add '--no-dev' in production
+===================================
+
+.. raw:: pdf
+
+ TextAnnotation "Prevents development dependencies from being installed, and potential security exploits from being added."
+
+An Example: Dransible
+=====================
+
+https://github.com/opdavies/dransible
+
+.. raw:: pdf
+
+ PageBreak imagePage
+
+.. image:: images/dransible-repo.png
+ :width: 20cm
+
+.. raw:: pdf
+
+ PageBreak standardPage
+
+Upgrading Dransible
+===================
+
+- Remove Drush (temporarily)
+- Update from Drupal 8.8 to 8.9
+- Add Upgrade Status module
+- Update contrib modules to D9 compatible versions
+- Remove incompatible contrib modules (if possible)
+- Fix deprecations in custom code
+- Upgrade from Drupal 8.9 to 9.0
+
+.. raw:: pdf
+
+ TextAnnotation "Without removing Drush, 8.9.0-beta2 rather than 8.9.2"
+ TextAnnotation "Updated Admin Toolbar module to a D9 compatible version"
+ TextAnnotation "Removed Config Installer as no longer needed"
+ TextAnnotation "Fixed deprecation warnings in custom code"
+ TextAnnotation "Installed Drush 10, removed and uninstalled Upgrade Status module"
+
+ PageBreak titlePage
+
+composer update drupal/core-* --with-dependencies
+=================================================
+
+composer require drupal/upgrade_status
+======================================
+
+.. raw:: pdf
+
+ PageBreak imagePage
+
+.. image:: images/dransible-screenshots/1.png
+ :width: 22cm
+
+.. image:: images/dransible-screenshots/2.png
+ :width: 22cm
+
+.. image:: images/dransible-screenshots/3.png
+ :width: 22cm
+
+.. image:: images/dransible-screenshots/4.png
+ :width: 22cm
+
+.. image:: images/dransible-screenshots/5.png
+ :width: 22cm
+
+.. image:: images/dransible-screenshots/6.png
+ :width: 20cm
+
+.. image:: images/dransible-screenshots/7.png
+ :width: 22cm
+
+.. image:: images/dransible-screenshots/8.png
+ :width: 22cm
+
+.. raw:: pdf
+
+ PageBreak titlePage
+
+composer update drupal/core-* --with-dependencies
+=================================================
+
+.. raw:: pdf
+
+ PageBreak imagePage
+
+.. image:: images/dransible-screenshots/9.png
+ :width: 22cm
+
+.. image:: images/dransible-screenshots/10.png
+ :width: 20cm
+
+.. raw:: pdf
+
+ TextAnnotation "Only 6 files changed rather than hundreds or thousands"
+ TextAnnotation "Vast majority of the changes in composer.lock (to be expected)"
+ TextAnnotation "Half of the changed files are project specific. Could have been 2 or 3 files changed on some projects."
+
+ PageBreak titlePage
+
+There were some autowiring gotchas...
+=====================================
+
+.. raw:: pdf
+
+ PageBreak
+
+Error: Class 'Symfony\Component\Config\Resource\ClassExistenceResource' not found in Symfony\Component\DependencyInjection\Compiler\AutowirePass->createTypeNotFoundMessage()
+
+composer require symfony/config:^4
+==================================
+
+.. raw:: pdf
+
+ TextAnnotation "Composer tried installing version 5 by default, so locked to 4.x."
+
+ PageBreak
+
+Cannot autowire service "Drupal\simple_message\DisplaySimpleMessage": argument "$messenger" of method "__construct()" references interface "Drupal\Core\Messenger\MessengerInterface" but no such service exists. You should maybe alias this interface to the existing "messenger" service
+
+.. raw:: pdf
+
+ PageBreak standardPage
+
+Fixing autowiring
+=================
+
+.. code-block:: yaml
+
+ services:
+ Drupal\simple_message\DisplaySimpleMessage:
+ autowire: true
+ tags:
+ - { name: event_subscriber }
+
+Fixing autowiring
+=================
+
+.. code-block:: diff
+
+ services:
+ + Drupal\Core\Messenger\MessengerInterface:
+ + alias: messenger
+
+ Drupal\simple_message\DisplaySimpleMessage:
+ autowire: true
+ tags:
+ - { name: event_subscriber }
+
+.. raw:: pdf
+
+ PageBreak titlePage
+
+..
+
+ The big deal about Drupal 9 is... that it should not be a big deal
+
+ -- Dries Buytaert
+
+.. raw:: pdf
+
+ TextAnnotation "Dransible updated in 1-2 hours."
+ TextAnnotation "No big rewrite."
+ TextAnnotation "Smallest core update PR ever!"
+
+ PageBreak standardPage
+
+Drupal 10
+=========
+
+- Released around June 2022
+- Drupal 9 EOL around November 2023
+- Symfony 4 EOL in November 2023
+- Another easy upgrade
+
+.. raw:: pdf
+
+ TextAnnotation "Need to keep up to date with dependencies."
+
+Thanks!
+=======
+
+References:
+
+* https://www.drupal.org/docs/understanding-drupal
+* https://dri.es/drupal-9-0-0-released
+* https://dri.es/drupal-10-target-release-date-and-drupal-9-end-of-life
+* https://github.com/opdavies/dransible
+
+|
+
+Me:
+
+* https://www.oliverdavies.uk