diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5aea456c481c..a0d15cacf2a3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,23 +6,10 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Added
 ### Dependencies
-- Bump `icu4j` from 62.1 to 62.2 ([#15469](https://github.com/opensearch-project/OpenSearch/pull/15469))
-- Bump `netty` from 4.1.112.Final to 4.1.114.Final ([#16182](https://github.com/opensearch-project/OpenSearch/pull/16182))
-- Bump `org.bouncycastle:bc-fips` from 1.0.2.4 to 1.0.2.5 ([#13446](https://github.com/opensearch-project/OpenSearch/pull/13446))
-- Bump `Netty` from 4.1.114.Final to 4.1.115.Final ([#16661](https://github.com/opensearch-project/OpenSearch/pull/16661))
-- Bump `avro` from 1.11.3 to 1.11.4 ([#16773](https://github.com/opensearch-project/OpenSearch/pull/16773))
-- Bump `protobuf-java` to 3.22.5 ([#16779](https://github.com/opensearch-project/OpenSearch/pull/16779))
-- Bump `commonsio` to 2.16.0 ([#16780](https://github.com/opensearch-project/OpenSearch/pull/16780))
-- Bump `protobuf-java` to 3.25.5 ([#16792](https://github.com/opensearch-project/OpenSearch/pull/16792))
-- Bump `snappy-java` to 1.1.10.7 ([#16792](https://github.com/opensearch-project/OpenSearch/pull/16792))
-
 ### Changed
 ### Deprecated
 ### Removed
 ### Fixed
-- Update help output for _cat ([#14722](https://github.com/opensearch-project/OpenSearch/pull/14722))
-- Bugfix to guard against stack overflow errors caused by very large reg-ex input ([#16101](https://github.com/opensearch-project/OpenSearch/pull/16101))
-
 ### Security
 
-[Unreleased 1.3.x]: https://github.com/opensearch-project/OpenSearch/compare/1.3.19...HEAD
+[Unreleased 1.3.x]: https://github.com/opensearch-project/OpenSearch/compare/1.3.20...HEAD
diff --git a/release-notes/opensearch.release-notes-1.3.20.md b/release-notes/opensearch.release-notes-1.3.20.md
new file mode 100644
index 0000000000000..fdc49aede4bf4
--- /dev/null
+++ b/release-notes/opensearch.release-notes-1.3.20.md
@@ -0,0 +1,15 @@
+## 2024-12-06 Version 1.3.20 Release Notes
+
+### Dependencies
+- Bump `icu4j` from 62.1 to 62.2 ([#15469](https://github.com/opensearch-project/OpenSearch/pull/15469))
+- Bump `org.bouncycastle:bc-fips` from 1.0.2.4 to 1.0.2.5 ([#13446](https://github.com/opensearch-project/OpenSearch/pull/13446))
+- Bump `Netty` from 4.1.112.Final to 4.1.115.Final ([#16661](https://github.com/opensearch-project/OpenSearch/pull/16661))
+- Bump `avro` from 1.11.3 to 1.11.4 ([#16773](https://github.com/opensearch-project/OpenSearch/pull/16773))
+- Bump `commonsio` to 2.16.0 ([#16780](https://github.com/opensearch-project/OpenSearch/pull/16780))
+- Bump `protobuf-java` to 3.25.5 ([#16792](https://github.com/opensearch-project/OpenSearch/pull/16792))
+- Bump `snappy-java` to 1.1.10.7 ([#16792](https://github.com/opensearch-project/OpenSearch/pull/16792))
+
+### Fixed
+- Update help output for _cat ([#14722](https://github.com/opensearch-project/OpenSearch/pull/14722))
+- Bugfix to guard against stack overflow errors caused by very large reg-ex input ([#16101](https://github.com/opensearch-project/OpenSearch/pull/16101))
+