diff --git a/documentation/src/main/resources/_data/sidebars/ditto_sidebar.yml b/documentation/src/main/resources/_data/sidebars/ditto_sidebar.yml
index 7b5d051663..69ea04fdaa 100644
--- a/documentation/src/main/resources/_data/sidebars/ditto_sidebar.yml
+++ b/documentation/src/main/resources/_data/sidebars/ditto_sidebar.yml
@@ -23,6 +23,9 @@ entries:
       - title: Release Notes
         output: web
         folderitems:
+          - title: 3.5.3
+            url: /release_notes_353.html
+            output: web
           - title: 3.5.2
             url: /release_notes_352.html
             output: web
diff --git a/documentation/src/main/resources/pages/ditto/release_notes_353.md b/documentation/src/main/resources/pages/ditto/release_notes_353.md
new file mode 100644
index 0000000000..151fd81d4e
--- /dev/null
+++ b/documentation/src/main/resources/pages/ditto/release_notes_353.md
@@ -0,0 +1,68 @@
+---
+title: Release notes 3.5.3
+tags: [release_notes]
+published: true
+keywords: release notes, announcements, changelog
+summary: "Version 3.5.3 of Eclipse Ditto, released on 26.02.2024"
+permalink: release_notes_353.html
+---
+
+This is a bugfix release, no new features since [3.5.2](release_notes_352.html) were added.
+
+## Changelog
+
+Compared to the latest release [3.5.2](release_notes_352.html), the following changes and bugfixes were added.
+
+### Changes
+
+#### Optimize Ditto internal pub/sub by adding subscribed for namespaces to topic
+
+Issue [#1894](https://github.com/eclipse-ditto/ditto/issues/1894) described how to optimize the Ditto
+internal pub/sub mechanism to filter out even more events before publishing to a subscriber which would
+drop them.  
+When using the `namespaces` filter when subscribing for events in e.g. connections, the selected namespaces
+are now also part of the pub/sub topic which prevents unnecessary transmissions in the cluster.  
+PR [#1900](https://github.com/eclipse-ditto/ditto/pull/1900) provides this internal optimization.
+
+#### Update deployment files and unit tests to use MongoDB 6.0
+
+In PR [#1897](https://github.com/eclipse-ditto/ditto/pull/1897) all unit tests and deployment files were
+updated to use MongoDB 6.0.
+
+
+### Bugfixes
+
+This is a complete list of the
+[merged pull requests](https://github.com/eclipse-ditto/ditto/pulls?q=is%3Apr+milestone%3A3.5.3).
+
+#### UI: Fix that incoming thing updates always repeated the first entry
+
+The UI contained a bug which caused that when "watching" changes of a selected thing, the
+"Incoming Thing Updates" list always repeated the first entry instead of correctly showing new entries.  
+This was fixed in PR [#1901](https://github.com/eclipse-ditto/ditto/pull/1901).
+
+#### Ensure consistency when doing signal enrichment
+
+When e.g. a Ditto connection published many events for a single thing in a short time and using
+[signal enrichment](basic-enrichment.hml), it was not guaranteed that the "enriched" data was from the same `revision`
+as the published event - leading to inconsistencies for things with high frequent updates.  
+This was reported in issue [#1893](https://github.com/eclipse-ditto/ditto/issues/1893) and fixed in PR 
+[#1904](https://github.com/eclipse-ditto/ditto/pull/1904).
+
+#### Fix time:now placeholder truncation
+
+The in Ditto 3.5.0 added "truncation" for the [time:now placeholder](basic-placeholders.html#time-placeholder) did not 
+work in certain cases.  
+This was fixed via PR [#1903](https://github.com/eclipse-ditto/ditto/pull/1903).
+
+
+### Helm Chart
+
+The [Ditto Helm Chart](https://github.com/eclipse-ditto/ditto/tree/master/deployment/helm) contained some configuration 
+bugs and enhancements which are also addressed with this bugfix release.
+
+#### Added option to add custom annotations to podDeletionCostPatching jobs
+
+In PR [#1902](https://github.com/eclipse-ditto/ditto/pull/1902) a new option to the Ditto Helm chart was added
+in order to specify custom annotations for the Helm chart jobs adding a "pod deletion cost" to Ditto k8s pods.  
+This e.g. is needed when running Ditto with Istio sidecars which would prevent the k8s jobs to finish.