diff --git a/CHANGELOG.md b/CHANGELOG.md
index caec4305b..d4adf7282 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ and this project adheres to
 
 ## [Unreleased]
 
+## [4.0.0] - 2024-01-23
+
 ### Added
 
 - Backends: Add `Writable` and `Listable` interfaces to distinguish supported
@@ -420,7 +422,8 @@ as per the xAPI specification
 - Add optional sentry integration
 - Distribute Arnold's tray to deploy Ralph in a k8s cluster as cronjobs
 
-[unreleased]: https://github.com/openfun/ralph/compare/v3.9.0...main
+[unreleased]: https://github.com/openfun/ralph/compare/v4.0.0...main
+[4.0.0]: https://github.com/openfun/ralph/compare/v3.9.0...v4.0.0
 [3.9.0]: https://github.com/openfun/ralph/compare/v3.8.0...v3.9.0
 [3.8.0]: https://github.com/openfun/ralph/compare/v3.7.0...v3.8.0
 [3.7.0]: https://github.com/openfun/ralph/compare/v3.6.0...v3.7.0
diff --git a/src/helm/CHANGELOG.md b/src/helm/CHANGELOG.md
index 9ee011b9f..20bb956de 100644
--- a/src/helm/CHANGELOG.md
+++ b/src/helm/CHANGELOG.md
@@ -9,6 +9,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Changed
+
+- Upgrade appVersion to `4.0.0`
+
 ## [0.2.0] - 2023-11-08
 
 ### Added
diff --git a/src/helm/ralph/Chart.yaml b/src/helm/ralph/Chart.yaml
index 2f91f484d..1e2e42cfc 100644
--- a/src/helm/ralph/Chart.yaml
+++ b/src/helm/ralph/Chart.yaml
@@ -4,7 +4,7 @@ name: ralph
 type: application
 description: The official Helm chart for Ralph
 version: 0.2.0
-appVersion: "3.9.0"
+appVersion: "4.0.0"
 
 dependencies:
   - name: mongodb
diff --git a/src/ralph/__init__.py b/src/ralph/__init__.py
index b0259a8b4..ff7d47975 100644
--- a/src/ralph/__init__.py
+++ b/src/ralph/__init__.py
@@ -1,3 +1,3 @@
 """Ralph module."""
 
-__version__ = "4.0.0b1"
+__version__ = "4.0.0"
diff --git a/src/tray/tray.yml b/src/tray/tray.yml
index 0f48321fe..595d2164e 100644
--- a/src/tray/tray.yml
+++ b/src/tray/tray.yml
@@ -1,3 +1,3 @@
 metadata:
   name: ralph
-  version: 3.9.0
+  version: 4.0.0