Merge remote-tracking branch 'upstream/develop' into 4.6

 Conflicts:
	user_guide_src/source/changelogs/index.rst
	user_guide_src/source/installation/upgrading.rst

user_guide_src/source/changelogs/index.rst

@@ -13,6 +13,7 @@ See all the changes.
     :titlesonly:
 
     v4.6.0
+    v4.5.5
     v4.5.4
     v4.5.3
     v4.5.2

user_guide_src/source/changelogs/v4.5.5.rst

@@ -0,0 +1,35 @@
+#############
+Version 4.5.5
+#############
+
+Release Date: Unreleased
+
+**4.5.5 release of CodeIgniter4**
+
+.. contents::
+    :local:
+    :depth: 3
+
+********
+BREAKING
+********
+
+***************
+Message Changes
+***************
+
+*******
+Changes
+*******
+
+************
+Deprecations
+************
+
+**********
+Bugs Fixed
+**********
+
+See the repo's
+`CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_
+for a complete list of bugs fixed.

user_guide_src/source/installation/upgrade_455.rst

@@ -0,0 +1,55 @@
+#############################
+Upgrading from 4.5.4 to 4.5.5
+#############################
+
+Please refer to the upgrade instructions corresponding to your installation method.
+
+- :ref:`Composer Installation App Starter Upgrading <app-starter-upgrading>`
+- :ref:`Composer Installation Adding CodeIgniter4 to an Existing Project Upgrading <adding-codeigniter4-upgrading>`
+- :ref:`Manual Installation Upgrading <installing-manual-upgrading>`
+
+.. contents::
+    :local:
+    :depth: 2
+
+**********************
+Mandatory File Changes
+**********************
+
+****************
+Breaking Changes
+****************
+
+*********************
+Breaking Enhancements
+*********************
+
+*************
+Project Files
+*************
+
+Some files in the **project space** (root, app, public, writable) received updates. Due to
+these files being outside of the **system** scope they will not be changed without your intervention.
+
+.. note:: There are some third-party CodeIgniter modules available to assist
+    with merging changes to the project space:
+    `Explore on Packagist <https://packagist.org/explore/?query=codeigniter4%20updates>`_.
+
+Content Changes
+===============
+
+The following files received significant changes (including deprecations or visual adjustments)
+and it is recommended that you merge the updated versions with your application:
+
+Config
+------
+
+- @TODO
+
+All Changes
+===========
+
+This is a list of all files in the **project space** that received changes;
+many will be simple comments or formatting that have no effect on the runtime:
+
+- @TODO

user_guide_src/source/installation/upgrading.rst

@@ -17,6 +17,7 @@ See also :doc:`./backward_compatibility_notes`.
     backward_compatibility_notes
 
     upgrade_460
+    upgrade_455
     upgrade_454
     upgrade_453
     upgrade_452