diff --git a/.changelog/12048.txt b/.changelog/12048.txt
new file mode 100644
index 00000000000..c500b9ef922
--- /dev/null
+++ b/.changelog/12048.txt
@@ -0,0 +1,3 @@
+```release-note:deprecation
+containerattached: deprecated `security_posture_config` field in `google_container_attached_cluster` resource
+```
\ No newline at end of file
diff --git a/google/services/containerattached/resource_container_attached_cluster.go b/google/services/containerattached/resource_container_attached_cluster.go
index 8698f858a09..75d2fd3a392 100644
--- a/google/services/containerattached/resource_container_attached_cluster.go
+++ b/google/services/containerattached/resource_container_attached_cluster.go
@@ -312,6 +312,7 @@ than 255 UTF-8 encoded bytes.`,
 				Type:        schema.TypeList,
 				Computed:    true,
 				Optional:    true,
+				Deprecated:  "`security_posture_config` is deprecated and will be removed in a future major release.",
 				Description: `Enable/Disable Security Posture API features for the cluster.`,
 				MaxItems:    1,
 				Elem: &schema.Resource{
diff --git a/google/services/containerattached/resource_container_attached_cluster_update_test.go b/google/services/containerattached/resource_container_attached_cluster_update_test.go
index 10411d88ef0..efbbfb627b0 100644
--- a/google/services/containerattached/resource_container_attached_cluster_update_test.go
+++ b/google/services/containerattached/resource_container_attached_cluster_update_test.go
@@ -120,9 +120,6 @@ resource "google_container_attached_cluster" "primary" {
       namespace = "default"
     }
   }
-  security_posture_config {
-    vulnerability_mode = "VULNERABILITY_ENTERPRISE"
-  }
 }
 `, context)
 }
@@ -171,9 +168,6 @@ resource "google_container_attached_cluster" "primary" {
       namespace = "custom-ns"
     }
   }
-  security_posture_config {
-    vulnerability_mode = "VULNERABILITY_DISABLED"
-  }
   lifecycle {
     prevent_destroy = true
   }
@@ -320,9 +314,6 @@ resource "google_container_attached_cluster" "primary" {
       namespace = "custom-ns"
     }
   }
-  security_posture_config {
-    vulnerability_mode = "VULNERABILITY_DISABLED"
-  }
 }
 `, context)
 }
diff --git a/website/docs/r/container_attached_cluster.html.markdown b/website/docs/r/container_attached_cluster.html.markdown
index 18736d29f89..af1a6f0913d 100644
--- a/website/docs/r/container_attached_cluster.html.markdown
+++ b/website/docs/r/container_attached_cluster.html.markdown
@@ -268,10 +268,12 @@ The following arguments are supported:
   Structure is [documented below](#nested_proxy_config).
 
 * `security_posture_config` -
-  (Optional)
+  (Optional, Deprecated)
   Enable/Disable Security Posture API features for the cluster.
   Structure is [documented below](#nested_security_posture_config).
 
+  ~> **Warning:** `security_posture_config` is deprecated and will be removed in a future major release.
+
 * `project` - (Optional) The ID of the project in which the resource belongs.
     If it is not provided, the provider project is used.