diff --git a/UPGRADING.md b/UPGRADING.md
index b0fe390d5c7..5e3bec894fc 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -6,6 +6,35 @@ More detailed information on key changes can be found in the [Developer update n
 
 The format of this change log follows the advice given at [Keep a CHANGELOG](https://keepachangelog.com).
 
+## 4.5.3+
+
+### core
+
+#### Added
+
+- Behat now supports email content verification using Mailpit.
+  You can check the contents of an email using the step `Then the email to "user@example.com" with subject containing "subject" should contain "content".`
+  To use this feature:
+  1. Ensure that Mailpit is running
+  2. Define the following constants in your `config.php`:
+      - `TEST_EMAILCATCHER_MAIL_SERVER` - The Mailpit server address (e.g. `0.0.0.0:1025`)
+      - `TEST_EMAILCATCHER_API_SERVER` - The Mailpit API server (qe.g. `http://localhost:8025`)
+
+  3. Ensure that the email catcher is set up using the step `Given an email catcher server is configured`.
+
+  For more information see [MDL-75971](https://tracker.moodle.org/browse/MDL-75971)
+- A new method, `core_text::trim_ctrl_chars()`, has been introduced to clean control characters from text. This ensures cleaner input handling and prevents issues caused by invisible or non-printable characters
+
+  For more information see [MDL-84907](https://tracker.moodle.org/browse/MDL-84907)
+
+### core_files
+
+#### Added
+
+- A new function `file_clear_draft_area()` has been added to delete the files in a draft area.
+
+  For more information see [MDL-72050](https://tracker.moodle.org/browse/MDL-72050)
+
 ## 4.5.3
 
 ### core_question
diff --git a/files/UPGRADING.md b/files/UPGRADING.md
index 5cfe9dc60d5..f9825604860 100644
--- a/files/UPGRADING.md
+++ b/files/UPGRADING.md
@@ -1,5 +1,13 @@
 # core_files (subsystem) Upgrade notes
 
+## 4.5.3+
+
+### Added
+
+- A new function `file_clear_draft_area()` has been added to delete the files in a draft area.
+
+  For more information see [MDL-72050](https://tracker.moodle.org/browse/MDL-72050)
+
 ## 4.5
 
 ### Added
diff --git a/lib/UPGRADING.md b/lib/UPGRADING.md
index 3afd9bfaa27..45ec0f6866c 100644
--- a/lib/UPGRADING.md
+++ b/lib/UPGRADING.md
@@ -1,5 +1,24 @@
 # core (subsystem) Upgrade notes
 
+## 4.5.3+
+
+### Added
+
+- Behat now supports email content verification using Mailpit.
+  You can check the contents of an email using the step `Then the email to "user@example.com" with subject containing "subject" should contain "content".`
+  To use this feature:
+  1. Ensure that Mailpit is running
+  2. Define the following constants in your `config.php`:
+      - `TEST_EMAILCATCHER_MAIL_SERVER` - The Mailpit server address (e.g. `0.0.0.0:1025`)
+      - `TEST_EMAILCATCHER_API_SERVER` - The Mailpit API server (qe.g. `http://localhost:8025`)
+
+  3. Ensure that the email catcher is set up using the step `Given an email catcher server is configured`.
+
+  For more information see [MDL-75971](https://tracker.moodle.org/browse/MDL-75971)
+- A new method, `core_text::trim_ctrl_chars()`, has been introduced to clean control characters from text. This ensures cleaner input handling and prevents issues caused by invisible or non-printable characters
+
+  For more information see [MDL-84907](https://tracker.moodle.org/browse/MDL-84907)
+
 ## 4.5.2
 
 ### Added