diff --git a/openapi/openapiv2.json b/openapi/openapiv2.json
index 60872a2de..3e62531ad 100644
--- a/openapi/openapiv2.json
+++ b/openapi/openapiv2.json
@@ -16179,11 +16179,10 @@
         "SUGGEST_CONTINUE_AS_NEW_REASON_UNSPECIFIED",
         "SUGGEST_CONTINUE_AS_NEW_REASON_HISTORY_SIZE_TOO_LARGE",
         "SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_HISTORY_EVENTS",
-        "SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_UPDATES",
-        "SUGGEST_CONTINUE_AS_NEW_REASON_TARGET_WORKER_DEPLOYMENT_VERSION_CHANGED"
+        "SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_UPDATES"
       ],
       "default": "SUGGEST_CONTINUE_AS_NEW_REASON_UNSPECIFIED",
-      "description": "SuggestContinueAsNewReason specifies why SuggestContinueAsNew is true.\n\n - SUGGEST_CONTINUE_AS_NEW_REASON_HISTORY_SIZE_TOO_LARGE: Workflow History size is getting too large.\n - SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_HISTORY_EVENTS: Workflow History event count is getting too large.\n - SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_UPDATES: Workflow's count of completed plus in-flight updates is too large.\n - SUGGEST_CONTINUE_AS_NEW_REASON_TARGET_WORKER_DEPLOYMENT_VERSION_CHANGED: Workflow's Target Worker Deployment Version is different from its\nCurrent Version and the workflow is versioned."
+      "description": "SuggestContinueAsNewReason specifies why SuggestContinueAsNew is true.\n\n - SUGGEST_CONTINUE_AS_NEW_REASON_HISTORY_SIZE_TOO_LARGE: Workflow History size is getting too large.\n - SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_HISTORY_EVENTS: Workflow History event count is getting too large.\n - SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_UPDATES: Workflow's count of completed plus in-flight updates is too large."
     },
     "v1TaskIdBlock": {
       "type": "object",
@@ -18444,6 +18443,10 @@
           },
           "description": "The reason(s) that suggest_continue_as_new is true, if it is.\nUnset if suggest_continue_as_new is false."
         },
+        "targetWorkerDeploymentVersionChanged": {
+          "type": "boolean",
+          "description": "True if Workflow's Target Worker Deployment Version is different from its Pinned Version and\nthe workflow is Pinned.\nExperimental."
+        },
         "historySizeBytes": {
           "type": "string",
           "format": "int64",
diff --git a/openapi/openapiv3.yaml b/openapi/openapiv3.yaml
index 7098105c5..9fea4880f 100644
--- a/openapi/openapiv3.yaml
+++ b/openapi/openapiv3.yaml
@@ -17188,12 +17188,17 @@ components:
               - SUGGEST_CONTINUE_AS_NEW_REASON_HISTORY_SIZE_TOO_LARGE
               - SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_HISTORY_EVENTS
               - SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_UPDATES
-              - SUGGEST_CONTINUE_AS_NEW_REASON_TARGET_WORKER_DEPLOYMENT_VERSION_CHANGED
             type: string
             format: enum
           description: |-
             The reason(s) that suggest_continue_as_new is true, if it is.
              Unset if suggest_continue_as_new is false.
+        targetWorkerDeploymentVersionChanged:
+          type: boolean
+          description: |-
+            True if Workflow's Target Worker Deployment Version is different from its Pinned Version and
+             the workflow is Pinned.
+             Experimental.
         historySizeBytes:
           type: string
           description: |-
diff --git a/temporal/api/enums/v1/workflow.proto b/temporal/api/enums/v1/workflow.proto
index e8dc52ef1..3e73ae6fa 100644
--- a/temporal/api/enums/v1/workflow.proto
+++ b/temporal/api/enums/v1/workflow.proto
@@ -204,7 +204,8 @@ enum SuggestContinueAsNewReason {
     // Workflow's count of completed plus in-flight updates is too large.
     SUGGEST_CONTINUE_AS_NEW_REASON_TOO_MANY_UPDATES = 3;
 
-    // Workflow's Target Worker Deployment Version is different from its
-    // Current Version and the workflow is versioned.
-    SUGGEST_CONTINUE_AS_NEW_REASON_TARGET_WORKER_DEPLOYMENT_VERSION_CHANGED = 4;
+    // TARGET_WORKER_DEPLOYMENT_VERSION_CHANGED is no longer a reason for suggest_continue_as_new.
+    // See target_worker_deployment_version_changed to find out if Target Version Changed.
+    reserved 4;
+    reserved "SUGGEST_CONTINUE_AS_NEW_REASON_TARGET_WORKER_DEPLOYMENT_VERSION_CHANGED";
 }
diff --git a/temporal/api/history/v1/message.proto b/temporal/api/history/v1/message.proto
index 4243baab6..2fb99f7e9 100644
--- a/temporal/api/history/v1/message.proto
+++ b/temporal/api/history/v1/message.proto
@@ -280,6 +280,10 @@ message WorkflowTaskStartedEventAttributes {
     // The reason(s) that suggest_continue_as_new is true, if it is.
     // Unset if suggest_continue_as_new is false.
     repeated temporal.api.enums.v1.SuggestContinueAsNewReason suggest_continue_as_new_reasons = 8;
+    // True if Workflow's Target Worker Deployment Version is different from its Pinned Version and
+    // the workflow is Pinned.
+    // Experimental.
+    bool target_worker_deployment_version_changed = 9;
     // Total history size in bytes, which the workflow might use to decide when to
     // continue-as-new regardless of the suggestion. Note that history event count is
     // just the event id of this event, so we don't include it explicitly here.