diff --git a/.github/workflows/pr-actions.yml b/.github/workflows/pr-actions.yml
index 1b1a7a53..6477ba5c 100644
--- a/.github/workflows/pr-actions.yml
+++ b/.github/workflows/pr-actions.yml
@@ -37,7 +37,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ '3.8', '3.9', '3.10', '3.11','3.12']
+        python-version: [ '3.8', '3.9', '3.10', '3.11']
         os: ['ubuntu-latest']
     name: PyTests OS ${{ matrix.os }} - Python ${{ matrix.python-version }}
     steps:
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b09e45d2..590d5045 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,8 @@ Brewtils Changelog
 TBD
 
 - Added new KWARG input to @command for tag/tags. This can be utilized for filtering commands.
+- Adding default topic for PublishClient to Plugins {Namespace}.{System}.{Version}.{Instance}
+- Removed Python 12 support until we upgrade Marshmallow dependency to 3.15 or greater
 
 3.21.0
 ------
diff --git a/brewtils/rest/publish_client.py b/brewtils/rest/publish_client.py
index f3571247..536f6adf 100644
--- a/brewtils/rest/publish_client.py
+++ b/brewtils/rest/publish_client.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 import logging
 
+from brewtils.errors import BrewtilsException
 import brewtils.plugin
 from brewtils.models import Event, Events, Request
 from brewtils.rest.easy_client import EasyClient
@@ -65,12 +66,19 @@ def __init__(self, *args, **kwargs):
         self._easy_client = EasyClient(*args, **kwargs)
 
     def publish(
-        self, _topic: str, _regex_only: bool = False, _propagate: bool = False, **kwargs
+        self,
+        _topic: str = None,
+        _regex_only: bool = False,
+        _propagate: bool = False,
+        **kwargs,
     ) -> bool:
         """Publishes event containing Request to be processed
 
+        Topic is added to request.metadata["_topic"]
+
         Args:
-            _topic (str): The topic to publish to
+            _topic (str): The topic to publish to, default is Plugin level topic
+                {Namespace}.{System}.{Version}.{Instance}
             _regex_only (bool): If the request will be resolved against only annotated topics
             from the @subscribe command
             _propagate (bool): If the request will be pushed up to the parent to be resolved.
@@ -79,6 +87,22 @@ def publish(
 
         """
 
+        if _topic is None:
+            if (
+                brewtils.plugin.CONFIG.name
+                and brewtils.plugin.CONFIG.version
+                and brewtils.plugin.CONFIG.instance_name
+                and brewtils.plugin.CONFIG.namespace
+            ):
+                _topic = "{0}.{1}.{2}.{3}".format(
+                    brewtils.plugin.CONFIG.namespace,
+                    brewtils.plugin.CONFIG.name,
+                    brewtils.plugin.CONFIG.version,
+                    brewtils.plugin.CONFIG.instance_name,
+                )
+            else:
+                raise BrewtilsException("Unable to determine _topic to publish to")
+
         comment = kwargs.pop("_comment", None)
         output_type = kwargs.pop("_output_type", None)
         metadata = kwargs.pop("_metadata", {})
diff --git a/test/rest/publish_client_test.py b/test/rest/publish_client_test.py
new file mode 100644
index 00000000..14a43842
--- /dev/null
+++ b/test/rest/publish_client_test.py
@@ -0,0 +1,79 @@
+import pytest
+from mock import Mock
+
+import brewtils.rest
+from brewtils.errors import BrewtilsException
+from brewtils.models import Event, Events, Request
+from brewtils.rest.publish_client import PublishClient
+from brewtils.schema_parser import SchemaParser
+
+
+@pytest.fixture(autouse=True)
+def easy_client(monkeypatch):
+    mock = Mock(name="easy_client")
+    mock.publish_event.return_value = True
+
+    monkeypatch.setattr(
+        brewtils.rest.publish_client, "EasyClient", Mock(return_value=mock)
+    )
+
+    return mock
+
+
+@pytest.fixture
+def client():
+    return PublishClient(bg_host="localhost", bg_port=3000)
+
+
+class TestPublishClient(object):
+    def setup_config(self):
+        brewtils.plugin.CONFIG.namespace = "foo"
+        brewtils.plugin.CONFIG.name = "foo"
+        brewtils.plugin.CONFIG.version = "1.0.0"
+        brewtils.plugin.CONFIG.instance_name = "foo"
+        brewtils.plugin.CONFIG.bg_host = "localhost"
+        brewtils.plugin.CONFIG.bg_port = "3000"
+
+    def test_publish(self, client):
+        assert client.publish(_topic="topic")
+
+    def test_missing_topic(self, client):
+        with pytest.raises(BrewtilsException):
+            assert client.publish(not_topic="topic")
+
+    def test_missing_topic_found(self, client, easy_client):
+        self.setup_config()
+        assert client.publish(no_topic="topic")
+
+        easy_client.publish_event.assert_called()
+        called_event = easy_client.publish_event.call_args.args[0]
+
+        assert called_event.metadata["topic"] == "foo.foo.1.0.0.foo"
+
+    def test_verify_generated_request(self, client, easy_client):
+        assert client.publish(
+            _topic="topic", _comment="_comment", _parent=None, value="test"
+        )
+
+        event = Event(
+            name=Events.REQUEST_TOPIC_PUBLISH.name,
+            metadata={
+                "topic": "topic",
+                "propagate": False,
+                "regex_only": False,
+            },
+            payload=Request(
+                comment="_comment",
+                output_type=None,
+                parent=None,
+                metadata={"_topic": "topic"},
+                parameters={"value": "test"},
+            ),
+            payload_type="Request",
+        )
+
+        easy_client.publish_event.assert_called()
+        called_event = easy_client.publish_event.call_args.args[0]
+        assert SchemaParser.serialize_event(
+            called_event
+        ) == SchemaParser.serialize_event(event)