diff --git a/apprise/plugins/google_chat.py b/apprise/plugins/google_chat.py
index 326fdb65..e7d99c33 100644
--- a/apprise/plugins/google_chat.py
+++ b/apprise/plugins/google_chat.py
@@ -223,7 +223,15 @@ class NotifyGoogleChat(NotifyBase):
         }
 
         if self.thread_key:
-            params["threadKey"] = self.thread_key
+            params.update({
+                "messageReplyOption": "REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD",
+            })
+
+            payload.update({
+                "thread": {
+                    "thread_key": self.thread_key,
+                }
+            })
 
         self.logger.debug(
             "Google Chat POST URL:"
diff --git a/tests/test_plugin_google_chat.py b/tests/test_plugin_google_chat.py
index 1d395846..a7d2d9aa 100644
--- a/tests/test_plugin_google_chat.py
+++ b/tests/test_plugin_google_chat.py
@@ -191,13 +191,14 @@ def test_plugin_google_chat_general(mock_post):
     params = mock_post.call_args_list[0][1]["params"]
     assert params.get("token") == token
     assert params.get("key") == key
-    assert "threadKey" not in params
+    assert "messageReplyOption" not in params
     payload = loads(mock_post.call_args_list[0][1]["data"])
+    assert "thread" not in payload
     assert payload["text"] == "title\r\ntest body"
 
     mock_post.reset_mock()
 
-    # Test our messaging with the threadKey
+    # Test our messaging with the thread_key
     obj = Apprise.instantiate(f"gchat://{workspace}/{key}/{token}/{threadkey}")
     assert isinstance(obj, NotifyGoogleChat)
     assert (
@@ -216,9 +217,12 @@ def test_plugin_google_chat_general(mock_post):
     params = mock_post.call_args_list[0][1]["params"]
     assert params.get("token") == token
     assert params.get("key") == key
-    assert params.get("threadKey") == threadkey
+    assert params.get("messageReplyOption") == \
+        "REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD"
     payload = loads(mock_post.call_args_list[0][1]["data"])
+    assert "thread" in payload
     assert payload["text"] == "title\r\ntest body"
+    assert payload["thread"].get("thread_key") == threadkey
 
 
 def test_plugin_google_chat_edge_case():