diff --git a/content/en/docs/concepts/configuration/configmap.md b/content/en/docs/concepts/configuration/configmap.md
index 9a134dfc99..d0195e6bd9 100644
--- a/content/en/docs/concepts/configuration/configmap.md
+++ b/content/en/docs/concepts/configuration/configmap.md
@@ -235,9 +235,9 @@ propagation delay, where the cache propagation delay depends on the chosen cache
 ConfigMaps consumed as environment variables are not updated automatically and require a pod restart. 
 ## Immutable ConfigMaps {#configmap-immutable}
 
-{{< feature-state for_k8s_version="v1.19" state="beta" >}}
+{{< feature-state for_k8s_version="v1.21" state="stable" >}}
 
-The Kubernetes beta feature _Immutable Secrets and ConfigMaps_ provides an option to set
+The Kubernetes feature _Immutable Secrets and ConfigMaps_ provides an option to set
 individual Secrets and ConfigMaps as immutable. For clusters that extensively use ConfigMaps
 (at least tens of thousands of unique ConfigMap to Pod mounts), preventing changes to their
 data has the following advantages:
diff --git a/content/en/docs/concepts/configuration/secret.md b/content/en/docs/concepts/configuration/secret.md
index 5a6a0dd092..ab627ce056 100644
--- a/content/en/docs/concepts/configuration/secret.md
+++ b/content/en/docs/concepts/configuration/secret.md
@@ -749,9 +749,9 @@ There are third party solutions for triggering restarts when secrets change.
 
 ## Immutable Secrets {#secret-immutable}
 
-{{< feature-state for_k8s_version="v1.19" state="beta" >}}
+{{< feature-state for_k8s_version="v1.21" state="stable" >}}
 
-The Kubernetes beta feature _Immutable Secrets and ConfigMaps_ provides an option to set
+The Kubernetes feature _Immutable Secrets and ConfigMaps_ provides an option to set
 individual Secrets and ConfigMaps as immutable. For clusters that extensively use Secrets
 (at least tens of thousands of unique Secret to Pod mounts), preventing changes to their
 data has the following advantages:
diff --git a/content/en/docs/reference/command-line-tools-reference/feature-gates.md b/content/en/docs/reference/command-line-tools-reference/feature-gates.md
index d9754afb56..bc5f066d73 100644
--- a/content/en/docs/reference/command-line-tools-reference/feature-gates.md
+++ b/content/en/docs/reference/command-line-tools-reference/feature-gates.md
@@ -124,8 +124,6 @@ different Kubernetes components.
 | `HugePageStorageMediumSize` | `false` | Alpha | 1.18 | 1.18 |
 | `HugePageStorageMediumSize` | `true` | Beta | 1.19 | |
 | `IPv6DualStack` | `false` | Alpha | 1.15 | |
-| `ImmutableEphemeralVolumes` | `false` | Alpha | 1.18 | 1.18 |
-| `ImmutableEphemeralVolumes` | `true` | Beta | 1.19 | |
 | `KubeletCredentialProviders` | `false` | Alpha | 1.20 | |
 | `KubeletPodResources` | `true` | Alpha | 1.13 | 1.14 |
 | `KubeletPodResources` | `true` | Beta | 1.15 | |
@@ -257,6 +255,9 @@ different Kubernetes components.
 | `HugePages` | `true` | GA | 1.14 | - |
 | `HyperVContainer` | `false` | Alpha | 1.10 | 1.19 |
 | `HyperVContainer` | `false` | Deprecated | 1.20 | - |
+| `ImmutableEphemeralVolumes` | `false` | Alpha | 1.18 | 1.18 |
+| `ImmutableEphemeralVolumes` | `true` | Beta | 1.19 | 1.20 |
+| `ImmutableEphemeralVolumes` | `true` | GA | 1.21 | |
 | `Initializers` | `false` | Alpha | 1.7 | 1.13 |
 | `Initializers` | - | Deprecated | 1.14 | - |
 | `KubeletConfigFile` | `false` | Alpha | 1.8 | 1.9 |