diff --git a/laborious/activities/opc.py b/laborious/activities/opc.py
index 277d935..ef1249f 100644
--- a/laborious/activities/opc.py
+++ b/laborious/activities/opc.py
@@ -143,7 +143,7 @@ class OPC(SientiaMonitoring):
                 level=NotificationLevel.ERROR,
                 attachment_content=trace,
             )
-            raise e
+            raise
 
     def validate_server(self, server_id: str, metadata: dict[str, Any]) -> bool:
         """
diff --git a/laborious/utils/repository/opc_repository.py b/laborious/utils/repository/opc_repository.py
index 2e797f3..e675415 100644
--- a/laborious/utils/repository/opc_repository.py
+++ b/laborious/utils/repository/opc_repository.py
@@ -1,8 +1,9 @@
 """
-Synchronous OPC UA client repository using python-opcua (opcua package).
+Synchronous OPC UA client repository using asyncua (opcua-asyncio) ``sync`` API.
 
-Connects to OPC UA servers, optionally configures Basic256 security, validates sessions,
-and writes node values with typed variants and Prometheus-compatible metrics.
+``asyncua.sync.Client`` runs the asyncio client on a background thread so callers
+stay synchronous. Connect/disconnect, optional Basic256 security, session checks,
+and typed writes mirror the previous python-opcua integration.
 """
 
 import json
@@ -12,8 +13,9 @@ from datetime import datetime
 from pathlib import Path
 from typing import Any
 
-from opcua import Client, ua
-from opcua.crypto import security_policies
+from asyncua import ua
+from asyncua.crypto import security_policies
+from asyncua.sync import Client
 from sientia_do.notifications.handlers import CoreNotificationHandler as NotificationHandler
 from sientia_do.notifications.models import NotificationLevel
 from sientia_do.observability.logger import Logger
@@ -54,7 +56,7 @@ class OpcRepository(SientiaMonitoring):
         url: OPC UA endpoint URL.
         id: Server identifier used in metrics and notifications.
         server_name: Human-readable server name for labels.
-        client: Active opcua.Client instance while connected.
+        client: Active ``asyncua.sync.Client`` while connected.
     """
 
     def __init__(
@@ -115,16 +117,17 @@ class OpcRepository(SientiaMonitoring):
         if self.client is None:
             raise ValueError('Client must be initialized before setting security')
 
-        self.client.application_uri = self.server_uri
+        self.client.application_uri = self.server_uri or self.client.application_uri
         self.logger.custom_info('Setting security...', self.metadata)
         self.client.set_security(
             security_policies.SecurityPolicyBasic256,
             str(cert),
             str(private_key),
+            None,
             str(server_cert) if server_cert else None,
         )
-        self.client.secure_channel_timeout = 10000000
-        self.client.session_timeout = 10000000
+        self.client.aio_obj.secure_channel_timeout = 10000000
+        self.client.aio_obj.session_timeout = 10000000
 
     def connect(self) -> tuple[bool, dict[str, Any]]:
         """
@@ -136,11 +139,11 @@ class OpcRepository(SientiaMonitoring):
 
         self.client = Client(self.url, timeout=10)
 
-        self.client.name = self.pod_id
-        self.client.application_name = self.pod_id
+        self.client.aio_obj.name = self.pod_id
+        self.client.aio_obj.description = self.pod_id
         pod_uri = self.pod_id.replace('-', ':')
         self.client.application_uri = pod_uri
-        self.client.product_uri = pod_uri
+        self.client.aio_obj.product_uri = pod_uri
 
         if self.cert_path:
             self.set_security()
@@ -336,7 +339,7 @@ class OpcRepository(SientiaMonitoring):
         Write a typed value to an OPC UA node after validating connectivity.
 
         Args:
-            node: Node id string accepted by opcua Client.get_node.
+            node: Node id string accepted by ``Client.get_node``.
             value: Scalar value to encode.
             data_type: Key into ``data_type_map`` (e.g. float, str).
             logger: Caller logger for per-write traces.
diff --git a/requirements-local.txt b/requirements-local.txt
index 8fbf9b2..df0d122 100644
--- a/requirements-local.txt
+++ b/requirements-local.txt
@@ -1,7 +1,7 @@
 temporalio
 psycopg2-binary
 sqlalchemy
-opcua
+asyncua==1.0.6
 redis
 #git+ssh://git@github.com/Aignosi/sientia-dataops-library.git@1.12.0
 /home/grezewave/Documents/projects/sientia/sientia-dataops-library
diff --git a/requirements.txt b/requirements.txt
index c848080..3b587fc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 temporalio
 psycopg2-binary
 sqlalchemy
-opcua
+asyncua==1.0.6
 redis
 sientia_do==1.12.0
 sientia_model==0.8.2
diff --git a/tests/laborious/utils/repository/test_opc_repository.py b/tests/laborious/utils/repository/test_opc_repository.py
index 88390fa..25ad5e9 100644
--- a/tests/laborious/utils/repository/test_opc_repository.py
+++ b/tests/laborious/utils/repository/test_opc_repository.py
@@ -3,7 +3,7 @@ from datetime import datetime
 from unittest.mock import ANY, MagicMock, Mock, patch
 
 import pytest
-from opcua.crypto import security_policies
+from asyncua.crypto import security_policies
 from sientia_do.notifications.models import NotificationLevel
 
 from laborious.utils.repository.opc_repository import OpcRepository
@@ -39,6 +39,7 @@ def opc_repository(mock_logger):
 def mock_client():
     with patch('laborious.utils.repository.opc_repository.Client') as mock:
         client_instance = MagicMock()
+        client_instance.aio_obj = MagicMock()
         mock.return_value = client_instance
         yield client_instance
 
@@ -75,10 +76,11 @@ def test_set_security(opc_repository, mock_client):
         security_policies.SecurityPolicyBasic256,
         '/path/to/cert.pem',
         '/path/to/key.pem',
+        None,
         '/path/to/server_cert.pem',
     )
-    assert mock_client.secure_channel_timeout == 10000000
-    assert mock_client.session_timeout == 10000000
+    assert mock_client.aio_obj.secure_channel_timeout == 10000000
+    assert mock_client.aio_obj.session_timeout == 10000000
 
 
 def test_set_security_missing_certificates(opc_repository):
diff --git a/values.yaml b/values.yaml
index 607d5ff..d0f7cb8 100644
--- a/values.yaml
+++ b/values.yaml
@@ -66,7 +66,7 @@ global:
     - name: GITHUB_REPO_URL
       value: "git@github.com:Aignosi/sientia-dataops-laborious_temporal.git"
     - name: GITHUB_BRANCH
-      value: "feature/SIENTIAPDE-1646"
+      value: "release/SIENTIAPDE-1646"
     - name: PYTHON_APP
       value: "laborious.worker.worker"
     - name: PYPI_SERVER
@@ -231,7 +231,7 @@ global:
 # - The runtime name is used by the worker bootstrap to resolve plugins and task queues.
 # - Keep runtime names in sync with the plugin-store runtime names.
 runtimes:
-  - name: "single"
+  - name: "basic"
     replicas: 1
 
 # -----------------------------------------------------------------------------