diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 5007cbb878..ad46626d2f 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -49827,7 +49827,15 @@
             "type": "string"
           },
           "version": {
-            "type": "string"
+            "oneOf": [
+              {
+                "type": "string"
+              },
+              {
+                "nullable": true,
+                "type": "string"
+              }
+            ]
           },
           "alias_count": {
             "type": "string"
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index 69df92d985..f3ec2127ad 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -33187,7 +33187,15 @@
             "type": "string"
           },
           "version": {
-            "type": "string"
+            "oneOf": [
+              {
+                "type": "string"
+              },
+              {
+                "nullable": true,
+                "type": "string"
+              }
+            ]
           },
           "alias_count": {
             "type": "string"
diff --git a/output/schema/schema-serverless.json b/output/schema/schema-serverless.json
index e5ba313772..9c4b2941fe 100644
--- a/output/schema/schema-serverless.json
+++ b/output/schema/schema-serverless.json
@@ -107504,11 +107504,23 @@
           "name": "version",
           "required": true,
           "type": {
-            "kind": "instance_of",
-            "type": {
-              "name": "string",
-              "namespace": "_builtins"
-            }
+            "items": [
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "string",
+                  "namespace": "_builtins"
+                }
+              },
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "null",
+                  "namespace": "_builtins"
+                }
+              }
+            ],
+            "kind": "union_of"
           }
         },
         {
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 19a6c3d521..6e99b5ffa5 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -91113,11 +91113,23 @@
           "name": "version",
           "required": true,
           "type": {
-            "kind": "instance_of",
-            "type": {
-              "name": "string",
-              "namespace": "_builtins"
-            }
+            "kind": "union_of",
+            "items": [
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "string",
+                  "namespace": "_builtins"
+                }
+              },
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "null",
+                  "namespace": "_builtins"
+                }
+              }
+            ]
           }
         },
         {
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index b803fc7594..4c545ba6fc 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -6982,7 +6982,7 @@ export type CatAllocationResponse = CatAllocationAllocationRecord[]
 
 export interface CatComponentTemplatesComponentTemplate {
   name: string
-  version: string
+  version: string | null
   alias_count: string
   mapping_count: string
   settings_count: string
diff --git a/specification/cat/component_templates/types.ts b/specification/cat/component_templates/types.ts
index fcad97e423..27bd124e2d 100644
--- a/specification/cat/component_templates/types.ts
+++ b/specification/cat/component_templates/types.ts
@@ -19,7 +19,7 @@
 
 export class ComponentTemplate {
   name: string
-  version: string
+  version: string | null
   alias_count: string
   mapping_count: string
   settings_count: string