diff --git a/ndc-client/tests/json_schema/capabilities_response.jsonschema b/ndc-client/tests/json_schema/capabilities_response.jsonschema
index 0a31b3c8..a99bfdf0 100644
--- a/ndc-client/tests/json_schema/capabilities_response.jsonschema
+++ b/ndc-client/tests/json_schema/capabilities_response.jsonschema
@@ -36,6 +36,16 @@
             }
           ]
         },
+        "mutation": {
+          "anyOf": [
+            {
+              "$ref": "#/definitions/MutationCapabilities"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
         "relationships": {
           "anyOf": [
             {
@@ -80,6 +90,23 @@
       "description": "A unit value to indicate a particular leaf capability is supported. This is an empty struct to allow for future sub-capabilities.",
       "type": "object"
     },
+    "MutationCapabilities": {
+      "title": "Mutation Capabilities",
+      "type": "object",
+      "properties": {
+        "transactional": {
+          "description": "Does the connector support executing multiple mutations in a transaction.",
+          "anyOf": [
+            {
+              "$ref": "#/definitions/LeafCapability"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      }
+    },
     "RelationshipCapabilities": {
       "title": "Relationship Capabilities",
       "type": "object",
diff --git a/ndc-reference/tests/capabilities/expected.json b/ndc-reference/tests/capabilities/expected.json
index 7632485a..1c955c5a 100644
--- a/ndc-reference/tests/capabilities/expected.json
+++ b/ndc-reference/tests/capabilities/expected.json
@@ -5,6 +5,7 @@
       "aggregates": {},
       "variables": {}
     },
+    "mutation": {},
     "relationships": {
       "relation_comparisons": {},
       "order_by_aggregate": {}
diff --git a/ndc-reference/tests/mutation/upsert_article/expected.json b/ndc-reference/tests/mutation/upsert_article/expected.json
index 7c333536..e5fd0ef5 100644
--- a/ndc-reference/tests/mutation/upsert_article/expected.json
+++ b/ndc-reference/tests/mutation/upsert_article/expected.json
@@ -7,16 +7,6 @@
           "__value": null
         }
       ]
-    },
-    {
-      "affected_rows": 1,
-      "returning": [
-        {
-          "__value": {
-            "id": 2
-          }
-        }
-      ]
     }
   ]
 }
\ No newline at end of file
diff --git a/ndc-reference/tests/mutation/upsert_article/request.json b/ndc-reference/tests/mutation/upsert_article/request.json
index 49bc03a1..9f6593f2 100644
--- a/ndc-reference/tests/mutation/upsert_article/request.json
+++ b/ndc-reference/tests/mutation/upsert_article/request.json
@@ -18,24 +18,7 @@
                     "column": "id"
                 }
             }
-        },
-        {
-            "type": "procedure",
-            "name": "upsert_article",
-            "arguments": {
-                "article": {
-                    "id": 2,
-                    "title": "QuickCheck: a lightweight tool for random testing of Haskell programs",
-                    "author_id": 2
-                }
-            },
-            "fields": {
-                "id": {
-                    "type": "column",
-                    "column": "id"
-                }
-            }
         }
     ],
     "collection_relationships": {}
-}
\ No newline at end of file
+}