diff --git a/RELEASE.md b/RELEASE.md
index ce7d52f1f..4144b0ebb 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,3 +1,38 @@
 # Release Note 🍻
 
-EMQX Operator 2.2.0-alpha.2 is released.
+EMQX Operator 2.2.0 is released.
+
+## Supported version
++ apps.emqx.io/v2alpha2
+
+  + EMQX at 5.1.1 and later
+  + EMQX Enterprise at 5.1.1 and later
+
++ apps.emqx.io/v1beta4
+
+  + EMQX at 4.4.14 and later
+  + EMQX Enterprise at 4.4.14 and later
+
+## Features 🌈
+
++ The `apps.emqx.io/v2alpha1 EMQX` upgrade to `apps.emqx.io/v2alpha2 EMQX`.
+
+  + New configuration management, now can manage and update EMQX configuration through `apps.emqx.io/v2alpha2 EMQX`, for more details, please refer to [Change EMQX Configurations](https://docs.emqx.com/en/emqx-operatoe/latest/tasks/configure-emqx-config.html).
+
+  + New upgrade strategy, now both EMQX 5 and EMQX Enterprise 5 can be upgraded through blue-green deployment. EMQX Enterprise Edition 5 also supports the feature of node evacuation, for more details, please refer to [Upgrade the EMQX cluster elegantly through blue-green deployment](https://docs.emqx.com/en/emqx-operatoe/latest/tasks/configure-emqx-blueGreenUpdate.html).
+
+
++ The `apps.emqx.io/v1beta4 rebalance` upgrade to `apps.emqx.io/v2alpha2 rebalance`, now `rebalance` can support both EMQX Enterprise 4 and EMQX Enterprise 5, for more details, please refer to [Cluster Load Rebalancing](https://docs.emqx.com/en/emqx-operator/latest/tasks/configure-emqx-rebalance.html).
+
+## How to install/upgrade EMQX Operator 💡
+
+> Need make sure the [cert-manager](https://cert-manager.io/) is ready
+
+```
+helm repo add emqx https://repos.emqx.io/charts
+helm repo update
+helm upgrade --install emqx-operator emqx/emqx-operator \
+  --namespace emqx-operator-system \
+  --create-namespace
+kubectl wait --for=condition=Ready pods -l "control-plane=controller-manager" -n emqx-operator-system
+```
diff --git a/deploy/charts/emqx-operator/Chart.yaml b/deploy/charts/emqx-operator/Chart.yaml
index 04ef3a415..02c3e54e7 100644
--- a/deploy/charts/emqx-operator/Chart.yaml
+++ b/deploy/charts/emqx-operator/Chart.yaml
@@ -15,9 +15,9 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 2.2.0-alpha.2
+version: 2.2.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
 # follow Semantic Versioning. They should reflect the version the application is using.
-appVersion: 2.2.0-alpha.2
+appVersion: 2.2.0