docs(changelog): changelog for lts-v2.8.18 release

Change-Id: I724783d1ee4c236e5947da8a147133824534e24a
Signed-off-by: Release CI <ci@trustedfirmware.org>
diff --git a/docs/change-log.md b/docs/change-log.md
index 36b35bb..195942c 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -3,6 +3,18 @@
 This document contains a summary of the new features, changes, fixes and known
 issues in each release of Trusted Firmware-A.
 
+## [lts-2.8.18](https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/refs/tags/lts-v2.8.17..refs/tags/lts-v2.8.18) (2024-04-26)
+
+### New Features
+
+- **Drivers**
+
+  - **Authentication**
+
+    - **mbedTLS**
+
+      - upgrade to version v2.28.8 ([a1cb5f6](https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/a1cb5f656e5e19741e840e452aa51f71fe24efbb))
+
 ## [lts-2.8.17](https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/refs/tags/lts-v2.8.16..refs/tags/lts-v2.8.17) (2024-04-12)
 
 ### Code Refactoring
diff --git a/docs/conf.py b/docs/conf.py
index 228644c..9ccea09 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -14,8 +14,8 @@
 
 project = "Trusted Firmware-A"
 author = "Trusted Firmware-A contributors"
-version = "2.8.17"
-release = "2.8.17"
+version = "2.8.18"
+release = "2.8.18"
 
 # -- General configuration ---------------------------------------------------