diff --git a/CHANGELOG.md b/CHANGELOG.md
index d31f829aec39..200b7adb037c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,32 @@
 # Changelog
 
+## [v4.5.8](https://github.com/codeigniter4/CodeIgniter4/tree/v4.5.8) (2025-01-19)
+[Full Changelog](https://github.com/codeigniter4/CodeIgniter4/compare/v4.5.7...v4.5.8)
+
+### Security
+
+* **HTTP** *Validation of header name and value*: Fixed a potential vulnerability on lack of proper header validation
+    for its name and value. See the [security advisory](https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-x5mq-jjr3-vmx6)
+    for more information. Credits to @neznaika0 for reporting.
+* **Security** fix: ensure csrf token is string by @datlechin in https://github.com/codeigniter4/CodeIgniter4/pull/9365
+
+### Fixed Bugs
+
+* fix: gather affected rows after query call failed by @michalsn in https://github.com/codeigniter4/CodeIgniter4/pull/9363
+
+### Refactoring
+
+* refactor: use more strict result check on preg_match_all() result by @samsonasik in https://github.com/codeigniter4/CodeIgniter4/pull/9361
+* refactor: Fix phpstan if.condNotBoolean by @neznaika0 in https://github.com/codeigniter4/CodeIgniter4/pull/9368
+* refactor: Fix phpstan when delete string key by @neznaika0 in https://github.com/codeigniter4/CodeIgniter4/pull/9369
+* refactor: Fix phpstan greaterOrEqual.invalid by @neznaika0 in https://github.com/codeigniter4/CodeIgniter4/pull/9370
+* refactor: Fix phpstan nullCoalesce by @neznaika0 in https://github.com/codeigniter4/CodeIgniter4/pull/9374
+* refactor: Fix phpstan isset offset by @neznaika0 in https://github.com/codeigniter4/CodeIgniter4/pull/9383
+* refactor: Fix phpstan return.missing by @neznaika0 in https://github.com/codeigniter4/CodeIgniter4/pull/9382
+* refactor: Fix phpstan booleanAnd.rightAlwaysTrue by @neznaika0 in https://github.com/codeigniter4/CodeIgniter4/pull/9367
+* refactor: Fix phpstan codeigniter.configArgumentInstanceof by @neznaika0 in https://github.com/codeigniter4/CodeIgniter4/pull/9390
+* refactor: Use `strtolower` with `str_contains`/`str_**_with` as replacement for `stripos` by @paulbalandan in https://github.com/codeigniter4/CodeIgniter4/pull/9414
+
 ## [v4.5.7](https://github.com/codeigniter4/CodeIgniter4/tree/v4.5.7) (2024-12-31)
 [Full Changelog](https://github.com/codeigniter4/CodeIgniter4/compare/v4.5.6...v4.5.7)
 
diff --git a/phpdoc.dist.xml b/phpdoc.dist.xml
index 5a287a06f294..ec53ca076b8a 100644
--- a/phpdoc.dist.xml
+++ b/phpdoc.dist.xml
@@ -10,7 +10,7 @@
         <output>api/build/</output>
         <cache>api/cache/</cache>
     </paths>
-    <version number="4.5.7">
+    <version number="4.5.8">
         <api format="php">
             <source dsn=".">
                 <path>system</path>
diff --git a/system/CodeIgniter.php b/system/CodeIgniter.php
index 716d3701d1a4..7325c1c8431b 100644
--- a/system/CodeIgniter.php
+++ b/system/CodeIgniter.php
@@ -56,7 +56,7 @@ class CodeIgniter
     /**
      * The current version of CodeIgniter Framework
      */
-    public const CI_VERSION = '4.5.7';
+    public const CI_VERSION = '4.5.8';
 
     /**
      * App startup time.
diff --git a/user_guide_src/source/changelogs/v4.5.8.rst b/user_guide_src/source/changelogs/v4.5.8.rst
index 910912ae5dc4..0fed2aaffefc 100644
--- a/user_guide_src/source/changelogs/v4.5.8.rst
+++ b/user_guide_src/source/changelogs/v4.5.8.rst
@@ -2,7 +2,7 @@
 Version 4.5.8
 #############
 
-Release Date: Unreleased
+Release Date: January 19, 2025
 
 **4.5.8 release of CodeIgniter4**
 
@@ -18,22 +18,6 @@ SECURITY
   See the `Security advisory GHSA-x5mq-jjr3-vmx6 <https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-x5mq-jjr3-vmx6>`_
   for more information.
 
-********
-BREAKING
-********
-
-***************
-Message Changes
-***************
-
-*******
-Changes
-*******
-
-************
-Deprecations
-************
-
 **********
 Bugs Fixed
 **********
diff --git a/user_guide_src/source/conf.py b/user_guide_src/source/conf.py
index 4effd4c7b822..34452f7d37f9 100644
--- a/user_guide_src/source/conf.py
+++ b/user_guide_src/source/conf.py
@@ -26,7 +26,7 @@
 version = '4.5'
 
 # The full version, including alpha/beta/rc tags.
-release = '4.5.7'
+release = '4.5.8'
 
 # -- General configuration ---------------------------------------------------
 
diff --git a/user_guide_src/source/installation/upgrade_458.rst b/user_guide_src/source/installation/upgrade_458.rst
index e8e8e681abe4..e24c98ac38c5 100644
--- a/user_guide_src/source/installation/upgrade_458.rst
+++ b/user_guide_src/source/installation/upgrade_458.rst
@@ -12,18 +12,6 @@ Please refer to the upgrade instructions corresponding to your installation meth
     :local:
     :depth: 2
 
-**********************
-Mandatory File Changes
-**********************
-
-****************
-Breaking Changes
-****************
-
-*********************
-Breaking Enhancements
-*********************
-
 *************
 Project Files
 *************
@@ -41,15 +29,12 @@ 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
+- preload.php
+- public/index.php
+- spark