diff --git a/source/retryable-writes/tests/unified/aggregate-out-merge.json b/source/retryable-writes/tests/unified/aggregate-out-merge.json
index c46bf8c31f..fd25c345ac 100644
--- a/source/retryable-writes/tests/unified/aggregate-out-merge.json
+++ b/source/retryable-writes/tests/unified/aggregate-out-merge.json
@@ -1,6 +1,6 @@
 {
   "description": "aggregate with $out/$merge does not set txnNumber",
-  "schemaVersion": "1.3",
+  "schemaVersion": "1.4",
   "runOnRequirements": [
     {
       "minServerVersion": "3.6",
@@ -45,6 +45,11 @@
   "tests": [
     {
       "description": "aggregate with $out does not set txnNumber",
+      "runOnRequirements": [
+        {
+          "serverless": "forbid"
+        }
+      ],
       "operations": [
         {
           "object": "collection0",
diff --git a/source/retryable-writes/tests/unified/aggregate-out-merge.yml b/source/retryable-writes/tests/unified/aggregate-out-merge.yml
index 66e61a8ed0..5114b31633 100644
--- a/source/retryable-writes/tests/unified/aggregate-out-merge.yml
+++ b/source/retryable-writes/tests/unified/aggregate-out-merge.yml
@@ -1,6 +1,6 @@
 description: "aggregate with $out/$merge does not set txnNumber"
 
-schemaVersion: "1.3"
+schemaVersion: "1.4"
 
 runOnRequirements:
   - minServerVersion: "3.6"
@@ -30,6 +30,8 @@ initialData:
   
 tests:
   - description: "aggregate with $out does not set txnNumber"
+    runOnRequirements:
+      - serverless: forbid # $out is not supported on serverless
     operations:
       - object: *collection0
         name: aggregate