diff --git a/juju/client/overrides.py b/juju/client/overrides.py
index 39e90eda9..4ef8c2766 100644
--- a/juju/client/overrides.py
+++ b/juju/client/overrides.py
@@ -80,11 +80,12 @@ async def AddPendingResources(self,
         Returns -> typing.Union[_ForwardRef('ErrorResult'),
                                 typing.Sequence<+T_co>[str]]
         """
+        version = _client.ResourcesFacade.best_facade_version(self.connection)
         # map input types to rpc msg
         _params = dict()
         msg = dict(type='Resources',
                    request='AddPendingResources',
-                   version=2,
+                   version=version,
                    params=_params)
         _params['tag'] = application_tag
         _params['url'] = charm_url
diff --git a/juju/model.py b/juju/model.py
index fdb1973ee..9ef701bd0 100644
--- a/juju/model.py
+++ b/juju/model.py
@@ -1739,7 +1739,8 @@ async def deploy(
             raise JujuError('unknown charm or bundle {}'.format(entity_url))
         identifier = res.identifier
 
-        series = res.origin.series or series
+        series = res.origin.series if self.connection().is_using_old_client \
+            else series
         if res.is_bundle:
             handler = BundleHandler(self, trusted=trust, forced=force)
             await handler.fetch_plan(url, res.origin, overlays=overlays)