diff --git a/clients/GitHubEnterprise-3.15/etc/openapi-client-generator.state b/clients/GitHubEnterprise-3.15/etc/openapi-client-generator.state
index 7398c6836a2..8d71b9dad00 100644
--- a/clients/GitHubEnterprise-3.15/etc/openapi-client-generator.state
+++ b/clients/GitHubEnterprise-3.15/etc/openapi-client-generator.state
@@ -1,5 +1,5 @@
 {
-    "specHash": "b323588c4cb3168432ec55824c9b764c",
+    "specHash": "6ea130cb5afd29dda26a543a1de89424",
     "generatedFiles": {
         "files": [
             {
@@ -13544,7 +13544,7 @@
             },
             {
                 "name": ".\/clients\/GitHubEnterprise-3.15\/etc\/..\/\/src\/\/Schema\/Announcement.php",
-                "hash": "7820e487bef8ae9be3f4be30ae0e3387"
+                "hash": "dfde9804d8140fe4092466dec23ad5a3"
             },
             {
                 "name": ".\/clients\/GitHubEnterprise-3.15\/etc\/..\/\/src\/\/Schema\/LicenseInfo.php",
@@ -27444,7 +27444,7 @@
             },
             {
                 "name": ".\/clients\/GitHubEnterprise-3.15\/etc\/..\/\/src\/\/Operation\/EnterpriseAdmin.php",
-                "hash": "7283ab444baadbfc831c091e6cd63c0d"
+                "hash": "c41e1e5ed253f0c166d3e55aeb3f84e0"
             },
             {
                 "name": ".\/clients\/GitHubEnterprise-3.15\/etc\/..\/\/src\/\/Operation\/SecurityAdvisories.php",
@@ -28032,7 +28032,7 @@
             },
             {
                 "name": ".\/clients\/GitHubEnterprise-3.15\/etc\/..\/\/src\/\/Internal\/Hydrator\/Operation\/Enterprise\/Announcement.php",
-                "hash": "2031eff3f5c8d7209048e852b5c84031"
+                "hash": "5e98612b79dbbc66f8c8e936476d0875"
             },
             {
                 "name": ".\/clients\/GitHubEnterprise-3.15\/etc\/..\/\/src\/\/Internal\/Hydrator\/Operation\/Enterprise\/Settings\/License.php",
diff --git a/clients/GitHubEnterprise-3.15/src/Internal/Hydrator/Operation/Enterprise/Announcement.php b/clients/GitHubEnterprise-3.15/src/Internal/Hydrator/Operation/Enterprise/Announcement.php
index ef13bd7422b..67e639e1e39 100644
--- a/clients/GitHubEnterprise-3.15/src/Internal/Hydrator/Operation/Enterprise/Announcement.php
+++ b/clients/GitHubEnterprise-3.15/src/Internal/Hydrator/Operation/Enterprise/Announcement.php
@@ -68,6 +68,17 @@ private function hydrateApiClients⚡️Client⚡️GitHubEnterprise⚡️Schema
             $properties['expiresAt'] = $value;
 
             after_expiresAt:
+
+            $value = $payload['user_dismissible'] ?? null;
+
+            if ($value === null) {
+                $properties['userDismissible'] = null;
+                goto after_userDismissible;
+            }
+
+            $properties['userDismissible'] = $value;
+
+            after_userDismissible:
         } catch (Throwable $exception) {
             throw UnableToHydrateObject::dueToError('ApiClients\Client\GitHubEnterprise\Schema\Announcement', $exception, stack: $this->hydrationStack);
         }
@@ -198,6 +209,14 @@ private function serializeObjectApiClients⚡️Client⚡️GitHubEnterprise⚡
 
         after_expiresAt:        $result['expires_at'] = $expiresAt;
 
+        $userDismissible = $object->userDismissible;
+
+        if ($userDismissible === null) {
+            goto after_userDismissible;
+        }
+
+        after_userDismissible:        $result['user_dismissible'] = $userDismissible;
+
         return $result;
     }
 
diff --git a/clients/GitHubEnterprise-3.15/src/Schema/Announcement.php b/clients/GitHubEnterprise-3.15/src/Schema/Announcement.php
index 3a63b1b60a5..523d76137c4 100644
--- a/clients/GitHubEnterprise-3.15/src/Schema/Announcement.php
+++ b/clients/GitHubEnterprise-3.15/src/Schema/Announcement.php
@@ -35,6 +35,17 @@
             "examples": [
                 "\\"2021-01-01T00:00:00.000-07:00\\""
             ]
+        },
+        "user_dismissible": {
+            "type": [
+                "boolean",
+                "null"
+            ],
+            "description": "Whether an announcement can be dismissed by the user.",
+            "default": false,
+            "examples": [
+                false
+            ]
         }
     },
     "description": "Enterprise global announcement"
@@ -43,15 +54,18 @@
     public const SCHEMA_DESCRIPTION  = 'Enterprise global announcement';
     public const SCHEMA_EXAMPLE_DATA = '{
     "announcement": "Very **important** announcement about _something_.",
-    "expires_at": "\\"2021-01-01T00:00:00.000-07:00\\""
+    "expires_at": "\\"2021-01-01T00:00:00.000-07:00\\"",
+    "user_dismissible": false
 }';
 
     /**
      * announcement: The announcement text in GitHub Flavored Markdown. For more information about GitHub Flavored Markdown, see "[Basic writing and formatting syntax](https://docs.github.com/enterprise-server@3.15/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax)."
      * expiresAt: The time at which the announcement expires. This is a timestamp in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format: `YYYY-MM-DDTHH:MM:SSZ`. To set an announcement that never expires, omit this parameter, set it to `null`, or set it to an empty string.
+     * userDismissible: Whether an announcement can be dismissed by the user.
      */
     public function __construct(public string|null $announcement, #[MapFrom('expires_at')]
-    public string|null $expiresAt,)
+    public string|null $expiresAt, #[MapFrom('user_dismissible')]
+    public bool|null $userDismissible,)
     {
     }
 }
diff --git a/etc/specs/GitHubEnterprise-3.15/current.spec.yaml b/etc/specs/GitHubEnterprise-3.15/current.spec.yaml
index 3b6b3941ba2..c8f4f218c48 100644
--- a/etc/specs/GitHubEnterprise-3.15/current.spec.yaml
+++ b/etc/specs/GitHubEnterprise-3.15/current.spec.yaml
@@ -34553,7 +34553,7 @@ paths:
           "$ref": "#/components/responses/validation_failed"
       x-github:
         githubCloudOnly: false
-        enabledForGitHubApps: false
+        enabledForGitHubApps: true
         category: reactions
         subcategory: reactions
   "/repos/{owner}/{repo}/issues/{issue_number}/reactions/{reaction_id}":
@@ -69539,6 +69539,14 @@ components:
         `null`, or set it to an empty string.'
       examples:
       - '"2021-01-01T00:00:00.000-07:00"'
+    announcement-user-dismissible:
+      type:
+      - boolean
+      - 'null'
+      description: Whether an announcement can be dismissed by the user.
+      default: false
+      examples:
+      - false
     announcement:
       title: Enterprise Announcement
       description: Enterprise global announcement
@@ -69548,6 +69556,8 @@ components:
           "$ref": "#/components/schemas/announcement-message"
         expires_at:
           "$ref": "#/components/schemas/announcement-expiration"
+        user_dismissible:
+          "$ref": "#/components/schemas/announcement-user-dismissible"
       required:
       - announcement
     license-info:
@@ -74662,14 +74672,6 @@ components:
       - created_at
       - updated_at
       - visibility
-    announcement-user-dismissible:
-      type:
-      - boolean
-      - 'null'
-      description: Whether an announcement can be dismissed by the user.
-      default: false
-      examples:
-      - false
     announcement-banner:
       title: Announcement Banner
       description: Announcement at either the repository, organization, or enterprise