diff --git a/RELEASE.md b/RELEASE.md
index 9c4ff1368..29c28c7f4 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,6 +1,6 @@
 # Release Note 🍻
 
-EMQX Operator 2.2.3 has been released.
+EMQX Operator 2.2.4 has been released.
 
 ## Supported version
 + apps.emqx.io/v2beta1
@@ -17,13 +17,40 @@ EMQX Operator 2.2.3 has been released.
 
 + `apps.emqx.io/v2beta1 EMQX`.
 
-  + Add `enabled` field in `.spec.dashboardServiceTemplate` and `.spec.listenersServiceTemplate` to enable or disable the creation of services
+  + Support EMQX dashboard https port
+
+  + The `.spec.bootstrapAPIKeys` can support k8s secret, the user can set EMQX's bootstrap API keys like this:
+
+    ```yaml
+    apiVersion: v1
+    kind: Secret
+    metadata:
+      name: emqx-secret
+    stringData:
+      key: foo
+      secret: bar
+    ---
+    apiVersion: apps.emqx.io/v2beta1
+    kind: EMQX
+    metadata:
+      name: emqx
+    spec:
+      image: emqx:5.1
+      bootstrapAPIKeys:
+        - secretRef:
+            key:
+              secretName: emqx-secret
+              secretKey: key
+            secret:
+              secretName: emqx-secret
+              secretKey: secret
+    ```
 
 ## Fixes 🛠
 
 + `apps.emqx.io/v2beta1 EMQX`.
 
-  + Fix typo error, the "toleRations" should be "tolerations" by Kubernetes conventions
+  + When performing a blue-green upgrade, EMQX Operator should select the old version of StatefulSet for request API
 
 ## How to install/upgrade EMQX Operator 💡
 
@@ -35,7 +62,7 @@ helm repo update
 helm upgrade --install emqx-operator emqx/emqx-operator \
   --namespace emqx-operator-system \
   --create-namespace \
-  --version 2.2.3
+  --version 2.2.4
 kubectl wait --for=condition=Ready pods -l "control-plane=controller-manager" -n emqx-operator-system
 ```