diff --git a/congress/datasources/nova_driver.py b/congress/datasources/nova_driver.py
index 7ef3df899..644bfda79 100644
--- a/congress/datasources/nova_driver.py
+++ b/congress/datasources/nova_driver.py
@@ -181,7 +181,7 @@ class NovaDriver(datasource_driver.PollingDataSourceDriver,
         self.creds = args
         session = ds_utils.get_keystone_session(self.creds)
         self.nova_client = novaclient.client.Client(
-            version=self.creds.get('api_version', '2'), session=session)
+            version=self.creds.get('api_version', '2.26'), session=session)
         self.add_executable_method('servers_set_meta',
                                    [{'name': 'server',
                                     'description': 'server id'},
diff --git a/releasenotes/notes/nova-2.26-api-default-5f0923890b2140fb.yaml b/releasenotes/notes/nova-2.26-api-default-5f0923890b2140fb.yaml
new file mode 100644
index 000000000..f62d3b8d9
--- /dev/null
+++ b/releasenotes/notes/nova-2.26-api-default-5f0923890b2140fb.yaml
@@ -0,0 +1,6 @@
+---
+prelude: >
+upgrade:
+  - Default API microversion used by Nova driver changed from 2 to 2.26 to
+    enable Nova tags. If version 2 is desired, please specify it explicitly
+    in data source configuration. For example, ``openstack congress datasource create --config api_version=2 --config username=admin --config tenant_name=admin  --config auth_url=http://127.0.0.1/identity --config password=password nova nova``