diff --git a/openapi/openapiv2.json b/openapi/openapiv2.json
index a0fd540fa..226b91d91 100644
--- a/openapi/openapiv2.json
+++ b/openapi/openapiv2.json
@@ -12875,6 +12875,11 @@
       "properties": {
         "deploymentVersion": {
           "$ref": "#/definitions/v1WorkerDeploymentVersion"
+        },
+        "revisionNumber": {
+          "type": "string",
+          "format": "int64",
+          "description": "Revision number of the task queue routing config at the time the target\nwas declined. If an incoming target's revision is <= this value, it is\nnot newer and is not used for deciding whether or not to suppress the\nupgrade signal."
         }
       },
       "description": "Wrapper for a target deployment version that the SDK declined to upgrade to.\nSee declined_target_version_upgrade on WorkflowExecutionStartedEventAttributes."
diff --git a/openapi/openapiv3.yaml b/openapi/openapiv3.yaml
index d753575c6..a418b7aee 100644
--- a/openapi/openapiv3.yaml
+++ b/openapi/openapiv3.yaml
@@ -9757,6 +9757,13 @@ components:
       properties:
         deploymentVersion:
           $ref: '#/components/schemas/WorkerDeploymentVersion'
+        revisionNumber:
+          type: string
+          description: |-
+            Revision number of the task queue routing config at the time the target
+             was declined. If an incoming target's revision is <= this value, it is
+             not newer and is not used for deciding whether or not to suppress the
+             upgrade signal.
       description: |-
         Wrapper for a target deployment version that the SDK declined to upgrade to.
          See declined_target_version_upgrade on WorkflowExecutionStartedEventAttributes.
diff --git a/temporal/api/history/v1/message.proto b/temporal/api/history/v1/message.proto
index bcd71928a..e873412bf 100644
--- a/temporal/api/history/v1/message.proto
+++ b/temporal/api/history/v1/message.proto
@@ -210,6 +210,11 @@ message WorkflowExecutionStartedEventAttributes {
 // See declined_target_version_upgrade on WorkflowExecutionStartedEventAttributes.
 message DeclinedTargetVersionUpgrade {
     temporal.api.deployment.v1.WorkerDeploymentVersion deployment_version = 1;
+    // Revision number of the task queue routing config at the time the target
+    // was declined. If an incoming target's revision is <= this value, it is
+    // not newer and is not used for deciding whether or not to suppress the
+    // upgrade signal.
+    int64 revision_number = 2;
 }
 
 message WorkflowExecutionCompletedEventAttributes {