diff --git a/openstack/accelerator/v2/accelerator_request.py b/openstack/accelerator/v2/accelerator_request.py
index cf1c6f372..35b0940fc 100644
--- a/openstack/accelerator/v2/accelerator_request.py
+++ b/openstack/accelerator/v2/accelerator_request.py
@@ -84,7 +84,7 @@ class AcceleratorRequest(resource.Resource):
         request = self._prepare_request(
             prepend_key=prepend_key, base_path=base_path, patch=True
         )
-        microversion = self._get_microversion(session, action='patch')
+        microversion = self._get_microversion(session)
         if patch:
             request.body = self._convert_patch(patch)
 
diff --git a/openstack/baremetal/v1/node.py b/openstack/baremetal/v1/node.py
index 3643822b6..8debcf8b5 100644
--- a/openstack/baremetal/v1/node.py
+++ b/openstack/baremetal/v1/node.py
@@ -973,7 +973,7 @@ class Node(_common.Resource):
             fails for a required interface.
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='fetch')
+        version = self._get_microversion(session)
 
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'validate')
@@ -1028,7 +1028,7 @@ class Node(_common.Resource):
 
     def _do_maintenance_action(self, session, verb, body=None):
         session = self._get_session(session)
-        version = self._get_microversion(session, action='commit')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'maintenance')
         response = getattr(session, verb)(
@@ -1047,7 +1047,7 @@ class Node(_common.Resource):
         :returns: The HTTP response.
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='fetch')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'management', 'boot_device')
 
@@ -1073,7 +1073,7 @@ class Node(_common.Resource):
         :returns: ``None``
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='commit')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'management', 'boot_device')
 
@@ -1097,7 +1097,7 @@ class Node(_common.Resource):
         :returns: The HTTP response.
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='fetch')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(
             request.url,
@@ -1295,7 +1295,7 @@ class Node(_common.Resource):
         :returns: The HTTP response.
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='commit')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(
             request.url, f'vendor_passthru?method={method}'
@@ -1325,7 +1325,7 @@ class Node(_common.Resource):
         :returns: The HTTP response.
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='fetch')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'vendor_passthru/methods')
 
@@ -1348,7 +1348,7 @@ class Node(_common.Resource):
         :returns: The HTTP response.
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='fetch')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'states', 'console')
 
@@ -1372,7 +1372,7 @@ class Node(_common.Resource):
         :return: ``None``
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='commit')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'states', 'console')
         if not isinstance(enabled, bool):
@@ -1407,7 +1407,7 @@ class Node(_common.Resource):
                 os_warnings.RemovedInSDK60Warning,
             )
         session = self._get_session(session)
-        version = self._get_microversion(session, action='fetch')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'inventory')
 
diff --git a/openstack/baremetal_introspection/v1/introspection.py b/openstack/baremetal_introspection/v1/introspection.py
index d7f3b878d..d268a5c98 100644
--- a/openstack/baremetal_introspection/v1/introspection.py
+++ b/openstack/baremetal_introspection/v1/introspection.py
@@ -62,7 +62,7 @@ class Introspection(resource.Resource):
 
         session = self._get_session(session)
 
-        version = self._get_microversion(session, action='delete')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'abort')
         response = session.post(
@@ -90,11 +90,7 @@ class Introspection(resource.Resource):
         """
         session = self._get_session(session)
 
-        version = (
-            self._get_microversion(session, action='fetch')
-            if processed
-            else '1.17'
-        )
+        version = self._get_microversion(session) if processed else '1.17'
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'data')
         if not processed:
diff --git a/openstack/block_storage/v2/backup.py b/openstack/block_storage/v2/backup.py
index cbb11fed3..e94c6ed8a 100644
--- a/openstack/block_storage/v2/backup.py
+++ b/openstack/block_storage/v2/backup.py
@@ -108,7 +108,7 @@ class Backup(resource.Resource):
             raise exceptions.MethodNotSupported(self, "create")
 
         session = self._get_session(session)
-        microversion = self._get_microversion(session, action='create')
+        microversion = self._get_microversion(session)
         requires_id = (
             self.create_requires_id
             if self.create_requires_id is not None
diff --git a/openstack/block_storage/v3/attachment.py b/openstack/block_storage/v3/attachment.py
index ba6e845a0..4a459b397 100644
--- a/openstack/block_storage/v3/attachment.py
+++ b/openstack/block_storage/v3/attachment.py
@@ -81,7 +81,7 @@ class Attachment(resource.Resource):
         """Mark the attachment as completed."""
         body = {'os-complete': self.id}
         if not microversion:
-            microversion = self._get_microversion(session, action='commit')
+            microversion = self._get_microversion(session)
         url = os.path.join(Attachment.base_path, self.id, 'action')
         response = session.post(url, json=body, microversion=microversion)
         exceptions.raise_from_response(response)
diff --git a/openstack/block_storage/v3/backup.py b/openstack/block_storage/v3/backup.py
index 1fd7204e0..6029f7763 100644
--- a/openstack/block_storage/v3/backup.py
+++ b/openstack/block_storage/v3/backup.py
@@ -124,7 +124,7 @@ class Backup(resource.Resource):
             raise exceptions.MethodNotSupported(self, "create")
 
         session = self._get_session(session)
-        microversion = self._get_microversion(session, action='create')
+        microversion = self._get_microversion(session)
         requires_id = (
             self.create_requires_id
             if self.create_requires_id is not None
diff --git a/openstack/block_storage/v3/group.py b/openstack/block_storage/v3/group.py
index 61f7bde79..7c67709ff 100644
--- a/openstack/block_storage/v3/group.py
+++ b/openstack/block_storage/v3/group.py
@@ -54,7 +54,7 @@ class Group(resource.Resource):
     def _action(self, session, body):
         """Preform group actions given the message body."""
         session = self._get_session(session)
-        microversion = self._get_microversion(session, action='create')
+        microversion = self._get_microversion(session)
         url = utils.urljoin(self.base_path, self.id, 'action')
         response = session.post(url, json=body, microversion=microversion)
         exceptions.raise_from_response(response)
@@ -81,7 +81,7 @@ class Group(resource.Resource):
     ):
         """Creates a new group from source."""
         session = cls._get_session(session)
-        microversion = cls._get_microversion(session, action='create')
+        microversion = cls._get_microversion(session)
         url = utils.urljoin(cls.base_path, 'action')
         body = {
             'create-from-src': {
diff --git a/openstack/block_storage/v3/group_type.py b/openstack/block_storage/v3/group_type.py
index 8ff929e38..eb09cf02a 100644
--- a/openstack/block_storage/v3/group_type.py
+++ b/openstack/block_storage/v3/group_type.py
@@ -51,7 +51,7 @@ class GroupType(resource.Resource):
         :returns: An updated version of this object.
         """
         url = utils.urljoin(GroupType.base_path, self.id, 'group_specs')
-        microversion = self._get_microversion(session, action='fetch')
+        microversion = self._get_microversion(session)
         response = session.get(url, microversion=microversion)
         exceptions.raise_from_response(response)
         specs = response.json().get('group_specs', {})
@@ -69,7 +69,7 @@ class GroupType(resource.Resource):
         :returns: An updated version of this object.
         """
         url = utils.urljoin(GroupType.base_path, self.id, 'group_specs')
-        microversion = self._get_microversion(session, action='create')
+        microversion = self._get_microversion(session)
         response = session.post(
             url,
             json={'group_specs': specs},
@@ -88,7 +88,7 @@ class GroupType(resource.Resource):
         :returns: The value of the group spec property.
         """
         url = utils.urljoin(GroupType.base_path, self.id, 'group_specs', prop)
-        microversion = self._get_microversion(session, action='fetch')
+        microversion = self._get_microversion(session)
         response = session.get(url, microversion=microversion)
         exceptions.raise_from_response(response)
         val = response.json().get(prop)
@@ -103,7 +103,7 @@ class GroupType(resource.Resource):
         :returns: The updated value of the group spec property.
         """
         url = utils.urljoin(GroupType.base_path, self.id, 'group_specs', prop)
-        microversion = self._get_microversion(session, action='commit')
+        microversion = self._get_microversion(session)
         response = session.put(
             url, json={prop: val}, microversion=microversion
         )
@@ -119,6 +119,6 @@ class GroupType(resource.Resource):
         :returns: None
         """
         url = utils.urljoin(GroupType.base_path, self.id, 'group_specs', prop)
-        microversion = self._get_microversion(session, action='delete')
+        microversion = self._get_microversion(session)
         response = session.delete(url, microversion=microversion)
         exceptions.raise_from_response(response)
diff --git a/openstack/block_storage/v3/transfer.py b/openstack/block_storage/v3/transfer.py
index 512802684..9c2643181 100644
--- a/openstack/block_storage/v3/transfer.py
+++ b/openstack/block_storage/v3/transfer.py
@@ -190,7 +190,7 @@ class Transfer(resource.Resource):
             path = '/os-volume-transfer'
 
         url = utils.urljoin(path, self.id, 'accept')
-        microversion = self._get_microversion(session, action='commit')
+        microversion = self._get_microversion(session)
         resp = session.post(
             url,
             json=body,
diff --git a/openstack/block_storage/v3/volume.py b/openstack/block_storage/v3/volume.py
index bdf840a65..4f756255a 100644
--- a/openstack/block_storage/v3/volume.py
+++ b/openstack/block_storage/v3/volume.py
@@ -113,14 +113,14 @@ class Volume(resource.Resource, metadata.MetadataMixin):
 
     _max_microversion = "3.60"
 
-    def _action(self, session, body, microversion=None, action='patch'):
+    def _action(self, session, body, microversion=None):
         """Preform volume actions given the message body."""
         # NOTE: This is using Volume.base_path instead of self.base_path
         # as both Volume and VolumeDetail instances can be acted on, but
         # the URL used is sans any additional /detail/ part.
         url = utils.urljoin(Volume.base_path, self.id, 'action')
         if microversion is None:
-            microversion = self._get_microversion(session, action=action)
+            microversion = self._get_microversion(session)
         resp = session.post(url, json=body, microversion=microversion)
         exceptions.raise_from_response(resp)
         return resp
diff --git a/openstack/compute/v2/flavor.py b/openstack/compute/v2/flavor.py
index e6d1390b3..40d7a2588 100644
--- a/openstack/compute/v2/flavor.py
+++ b/openstack/compute/v2/flavor.py
@@ -164,7 +164,7 @@ class Flavor(resource.Resource):
         :returns: The updated flavor.
         """
         url = utils.urljoin(Flavor.base_path, self.id, 'os-extra_specs')
-        microversion = self._get_microversion(session, action='fetch')
+        microversion = self._get_microversion(session)
         response = session.get(url, microversion=microversion)
         exceptions.raise_from_response(response)
         specs = response.json().get('extra_specs', {})
@@ -179,7 +179,7 @@ class Flavor(resource.Resource):
         :returns: The updated flavor.
         """
         url = utils.urljoin(Flavor.base_path, self.id, 'os-extra_specs')
-        microversion = self._get_microversion(session, action='create')
+        microversion = self._get_microversion(session)
         response = session.post(
             url, json={'extra_specs': specs}, microversion=microversion
         )
@@ -196,7 +196,7 @@ class Flavor(resource.Resource):
         :returns: The value of the property if it exists, else ``None``.
         """
         url = utils.urljoin(Flavor.base_path, self.id, 'os-extra_specs', prop)
-        microversion = self._get_microversion(session, action='fetch')
+        microversion = self._get_microversion(session)
         response = session.get(url, microversion=microversion)
         exceptions.raise_from_response(response)
         val = response.json().get(prop)
@@ -211,7 +211,7 @@ class Flavor(resource.Resource):
         :returns: The updated value of the property.
         """
         url = utils.urljoin(Flavor.base_path, self.id, 'os-extra_specs', prop)
-        microversion = self._get_microversion(session, action='commit')
+        microversion = self._get_microversion(session)
         response = session.put(
             url, json={prop: val}, microversion=microversion
         )
@@ -227,7 +227,7 @@ class Flavor(resource.Resource):
         :returns: None
         """
         url = utils.urljoin(Flavor.base_path, self.id, 'os-extra_specs', prop)
-        microversion = self._get_microversion(session, action='delete')
+        microversion = self._get_microversion(session)
         response = session.delete(url, microversion=microversion)
         exceptions.raise_from_response(response)
 
diff --git a/openstack/compute/v2/hypervisor.py b/openstack/compute/v2/hypervisor.py
index fdcb1afee..c80016941 100644
--- a/openstack/compute/v2/hypervisor.py
+++ b/openstack/compute/v2/hypervisor.py
@@ -95,7 +95,7 @@ class Hypervisor(resource.Resource):
                 'Hypervisor.get_uptime is not supported anymore'
             )
         url = utils.urljoin(self.base_path, self.id, 'uptime')
-        microversion = self._get_microversion(session, action='fetch')
+        microversion = self._get_microversion(session)
         response = session.get(url, microversion=microversion)
         self._translate_response(response)
         return self
diff --git a/openstack/compute/v2/server.py b/openstack/compute/v2/server.py
index 5ecf09898..069caacd1 100644
--- a/openstack/compute/v2/server.py
+++ b/openstack/compute/v2/server.py
@@ -333,7 +333,7 @@ class Server(resource.Resource, metadata.MetadataMixin, tag.TagMixin):
         # these aren't all necessary "commit" actions (i.e. updates) but it's
         # good enough...
         if microversion is None:
-            microversion = self._get_microversion(session, action='commit')
+            microversion = self._get_microversion(session)
 
         response = session.post(
             url,
@@ -362,7 +362,7 @@ class Server(resource.Resource, metadata.MetadataMixin, tag.TagMixin):
         """
         url = utils.urljoin(Server.base_path, self.id, 'os-server-password')
         if microversion is None:
-            microversion = self._get_microversion(session, action='commit')
+            microversion = self._get_microversion(session)
 
         response = session.get(url, microversion=microversion)
         exceptions.raise_from_response(response)
@@ -381,7 +381,7 @@ class Server(resource.Resource, metadata.MetadataMixin, tag.TagMixin):
         """
         url = utils.urljoin(Server.base_path, self.id, 'os-server-password')
         if microversion is None:
-            microversion = self._get_microversion(session, action='commit')
+            microversion = self._get_microversion(session)
 
         response = session.delete(url, microversion=microversion)
         exceptions.raise_from_response(response)
diff --git a/openstack/compute/v2/server_group.py b/openstack/compute/v2/server_group.py
index f61382b16..597453a4d 100644
--- a/openstack/compute/v2/server_group.py
+++ b/openstack/compute/v2/server_group.py
@@ -76,7 +76,7 @@ class ServerGroup(resource.Resource):
             raise exceptions.MethodNotSupported(self, 'create')
 
         session = self._get_session(session)
-        microversion = self._get_microversion(session, action='create')
+        microversion = self._get_microversion(session)
         requires_id = (
             self.create_requires_id
             if self.create_requires_id is not None
diff --git a/openstack/compute/v2/server_migration.py b/openstack/compute/v2/server_migration.py
index 42585ab32..fbc6a2ccc 100644
--- a/openstack/compute/v2/server_migration.py
+++ b/openstack/compute/v2/server_migration.py
@@ -74,7 +74,7 @@ class ServerMigration(resource.Resource):
     def _action(self, session, body):
         """Preform server migration actions given the message body."""
         session = self._get_session(session)
-        microversion = self._get_microversion(session, action='list')
+        microversion = self._get_microversion(session)
 
         url = utils.urljoin(
             self.base_path % {'server_id': self.server_id},
diff --git a/openstack/dns/v2/zone_export.py b/openstack/dns/v2/zone_export.py
index 34e0012e2..7a4215413 100644
--- a/openstack/dns/v2/zone_export.py
+++ b/openstack/dns/v2/zone_export.py
@@ -70,7 +70,7 @@ class ZoneExport(_base.Resource):
             raise exceptions.MethodNotSupported(self, "create")
 
         session = self._get_session(session)
-        microversion = self._get_microversion(session, action='create')
+        microversion = self._get_microversion(session)
         # Create ZoneExport requires empty body
         # skip _prepare_request completely, since we need just empty body
         request = resource._Request(self.base_path, None, None)
diff --git a/openstack/dns/v2/zone_import.py b/openstack/dns/v2/zone_import.py
index 8f875f7b1..8d2c3e145 100644
--- a/openstack/dns/v2/zone_import.py
+++ b/openstack/dns/v2/zone_import.py
@@ -70,7 +70,7 @@ class ZoneImport(_base.Resource):
             raise exceptions.MethodNotSupported(self, "create")
 
         session = self._get_session(session)
-        microversion = self._get_microversion(session, action='create')
+        microversion = self._get_microversion(session)
         # Create ZoneImport requires empty body and 'text/dns' as content-type
         # skip _prepare_request completely, since we need just empty body
         request = resource._Request(
diff --git a/openstack/image/v2/cache.py b/openstack/image/v2/cache.py
index f181cf59b..b0ad60834 100644
--- a/openstack/image/v2/cache.py
+++ b/openstack/image/v2/cache.py
@@ -46,7 +46,7 @@ class Cache(resource.Resource):
         :returns: The server response
         """
         if microversion is None:
-            microversion = self._get_microversion(session, action='commit')
+            microversion = self._get_microversion(session)
         image_id = resource.Resource._get_id(image)
         url = utils.urljoin(self.base_path, image_id)
 
diff --git a/openstack/image/v2/metadef_property.py b/openstack/image/v2/metadef_property.py
index 9abbaacac..20dcc808c 100644
--- a/openstack/image/v2/metadef_property.py
+++ b/openstack/image/v2/metadef_property.py
@@ -102,7 +102,7 @@ class MetadefProperty(resource.Resource):
         session = cls._get_session(session)
 
         if microversion is None:
-            microversion = cls._get_microversion(session, action='list')
+            microversion = cls._get_microversion(session)
 
         if base_path is None:
             base_path = cls.base_path
diff --git a/openstack/load_balancer/v2/amphora.py b/openstack/load_balancer/v2/amphora.py
index f8e9c4de5..b84156ef8 100644
--- a/openstack/load_balancer/v2/amphora.py
+++ b/openstack/load_balancer/v2/amphora.py
@@ -106,7 +106,7 @@ class Amphora(resource.Resource):
         :returns: None
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='patch')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'config')
 
@@ -126,7 +126,7 @@ class Amphora(resource.Resource):
         :returns: None
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='patch')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'failover')
 
diff --git a/openstack/load_balancer/v2/load_balancer.py b/openstack/load_balancer/v2/load_balancer.py
index 02fd6a235..1668e484e 100644
--- a/openstack/load_balancer/v2/load_balancer.py
+++ b/openstack/load_balancer/v2/load_balancer.py
@@ -109,7 +109,7 @@ class LoadBalancer(resource.Resource, tag.TagMixin):
         :returns: None
         """
         session = self._get_session(session)
-        version = self._get_microversion(session, action='patch')
+        version = self._get_microversion(session)
         request = self._prepare_request(requires_id=True)
         request.url = utils.urljoin(request.url, 'failover')
 
diff --git a/openstack/object_store/v1/info.py b/openstack/object_store/v1/info.py
index c1dde93b7..5b874067f 100644
--- a/openstack/object_store/v1/info.py
+++ b/openstack/object_store/v1/info.py
@@ -85,7 +85,7 @@ class Info(resource.Resource):
         session = self._get_session(session)
         info_url = self._get_info_url(session.get_endpoint())
 
-        microversion = self._get_microversion(session, action='fetch')
+        microversion = self._get_microversion(session)
         response = session.get(info_url, microversion=microversion)
 
         self.microversion = microversion
diff --git a/openstack/object_store/v1/obj.py b/openstack/object_store/v1/obj.py
index 3b036e55a..9b51641c0 100644
--- a/openstack/object_store/v1/obj.py
+++ b/openstack/object_store/v1/obj.py
@@ -337,7 +337,7 @@ class Object(_base.BaseResource):
         request = self._prepare_request(**kwargs)
         session = self._get_session(session)
         if microversion is None:
-            microversion = self._get_microversion(session, action='delete')
+            microversion = self._get_microversion(session)
 
         if self.is_static_large_object is None:
             # Fetch metadata to determine SLO flag
diff --git a/openstack/orchestration/v1/stack.py b/openstack/orchestration/v1/stack.py
index 2571e2a61..8e8712d35 100644
--- a/openstack/orchestration/v1/stack.py
+++ b/openstack/orchestration/v1/stack.py
@@ -142,7 +142,7 @@ class Stack(resource.Resource):
             prepend_key=False, requires_id=False, base_path=base_path
         )
 
-        microversion = self._get_microversion(session, action='commit')
+        microversion = self._get_microversion(session)
 
         request_url = request.url
         if preview:
@@ -225,7 +225,7 @@ class Stack(resource.Resource):
             requires_id=requires_id, base_path=base_path
         )
         # session = self._get_session(session)
-        microversion = self._get_microversion(session, action='fetch')
+        microversion = self._get_microversion(session)
 
         # NOTE(gtema): would be nice to simply use QueryParameters, however
         # Heat return 302 with parameters being set into URL and requests
diff --git a/openstack/placement/v1/resource_provider.py b/openstack/placement/v1/resource_provider.py
index 4da2d3bcc..4419ab4b2 100644
--- a/openstack/placement/v1/resource_provider.py
+++ b/openstack/placement/v1/resource_provider.py
@@ -71,7 +71,7 @@ class ResourceProvider(resource.Resource):
         :return: The resource provider with aggregates populated
         """
         url = utils.urljoin(self.base_path, self.id, 'aggregates')
-        microversion = self._get_microversion(session, action='fetch')
+        microversion = self._get_microversion(session)
 
         response = session.get(url, microversion=microversion)
         exceptions.raise_from_response(response)
@@ -92,7 +92,7 @@ class ResourceProvider(resource.Resource):
         :return: The resource provider with updated aggregates populated
         """
         url = utils.urljoin(self.base_path, self.id, 'aggregates')
-        microversion = self._get_microversion(session, action='commit')
+        microversion = self._get_microversion(session)
 
         body = {
             'aggregates': aggregates or [],
diff --git a/openstack/placement/v1/resource_provider_inventory.py b/openstack/placement/v1/resource_provider_inventory.py
index d178e88a5..443483a9c 100644
--- a/openstack/placement/v1/resource_provider_inventory.py
+++ b/openstack/placement/v1/resource_provider_inventory.py
@@ -113,7 +113,7 @@ class ResourceProviderInventory(resource.Resource):
         session = cls._get_session(session)
 
         if microversion is None:
-            microversion = cls._get_microversion(session, action='list')
+            microversion = cls._get_microversion(session)
 
         if base_path is None:
             base_path = cls.base_path
diff --git a/openstack/placement/v1/trait.py b/openstack/placement/v1/trait.py
index 75b7875ba..be941f2b7 100644
--- a/openstack/placement/v1/trait.py
+++ b/openstack/placement/v1/trait.py
@@ -64,7 +64,7 @@ class Trait(resource.Resource):
         session = cls._get_session(session)
 
         if microversion is None:
-            microversion = cls._get_microversion(session, action='list')
+            microversion = cls._get_microversion(session)
 
         if base_path is None:
             base_path = cls.base_path
diff --git a/openstack/resource.py b/openstack/resource.py
index 78e2134cf..9caef9029 100644
--- a/openstack/resource.py
+++ b/openstack/resource.py
@@ -53,6 +53,8 @@ from openstack import warnings as os_warnings
 
 LOG = _log.setup_logging(__name__)
 
+AdapterT = ty.TypeVar('AdapterT', bound=adapter.Adapter)
+
 
 # TODO(stephenfin): We should deprecate the 'type' and 'list_type' arguments
 # for all of the below in favour of annotations. To that end, we have stuck
@@ -1218,7 +1220,7 @@ class Resource(dict):
         dict.update(self, self.to_dict())
 
     @classmethod
-    def _get_session(cls, session):
+    def _get_session(cls, session: AdapterT) -> AdapterT:
         """Attempt to get an Adapter from a raw session.
 
         Some older code used conn.session has the session argument to Resource
@@ -1238,9 +1240,8 @@ class Resource(dict):
             "a raw keystoneauth1.adapter.Adapter."
         )
 
-    # TODO(stephenfin): Drop action argument. It has never been used.
     @classmethod
-    def _get_microversion(cls, session, *, action=None):
+    def _get_microversion(cls, session: adapter.Adapter) -> ty.Optional[str]:
         """Get microversion to use for the given action.
 
         The base version uses the following logic:
@@ -1255,21 +1256,8 @@ class Resource(dict):
 
         :param session: The session to use for making the request.
         :type session: :class:`~keystoneauth1.adapter.Adapter`
-        :param action: One of "fetch", "commit", "create", "delete", "patch".
-        :type action: str
         :return: Microversion as string or ``None``
         """
-        if action not in {
-            'list',
-            'fetch',
-            'commit',
-            'create',
-            'delete',
-            'patch',
-            None,
-        }:
-            raise ValueError(f'Invalid action: {action}')
-
         if session.default_microversion:
             return session.default_microversion
 
@@ -1372,7 +1360,7 @@ class Resource(dict):
 
         session = self._get_session(session)
         if microversion is None:
-            microversion = self._get_microversion(session, action='create')
+            microversion = self._get_microversion(session)
         requires_id = (
             self.create_requires_id
             if self.create_requires_id is not None
@@ -1475,7 +1463,7 @@ class Resource(dict):
 
         session = cls._get_session(session)
         if microversion is None:
-            microversion = cls._get_microversion(session, action='create')
+            microversion = cls._get_microversion(session)
         requires_id = (
             cls.create_requires_id
             if cls.create_requires_id is not None
@@ -1588,7 +1576,7 @@ class Resource(dict):
 
         session = self._get_session(session)
         if microversion is None:
-            microversion = self._get_microversion(session, action='fetch')
+            microversion = self._get_microversion(session)
         self.microversion = microversion
 
         response = session.get(
@@ -1626,7 +1614,7 @@ class Resource(dict):
 
         session = self._get_session(session)
         if microversion is None:
-            microversion = self._get_microversion(session, action='fetch')
+            microversion = self._get_microversion(session)
         self.microversion = microversion
 
         request = self._prepare_request(base_path=base_path)
@@ -1694,7 +1682,7 @@ class Resource(dict):
             **kwargs,
         )
         if microversion is None:
-            microversion = self._get_microversion(session, action='commit')
+            microversion = self._get_microversion(session)
 
         return self._commit(
             session,
@@ -1824,7 +1812,7 @@ class Resource(dict):
             patch=True,
         )
         if microversion is None:
-            microversion = self._get_microversion(session, action='patch')
+            microversion = self._get_microversion(session)
         if patch:
             request.body += self._convert_patch(patch)
 
@@ -1874,7 +1862,7 @@ class Resource(dict):
         request = self._prepare_request(**kwargs)
         session = self._get_session(session)
         if microversion is None:
-            microversion = self._get_microversion(session, action='delete')
+            microversion = self._get_microversion(session)
 
         return session.delete(
             request.url,
@@ -1938,7 +1926,7 @@ class Resource(dict):
         session = cls._get_session(session)
 
         if microversion is None:
-            microversion = cls._get_microversion(session, action='list')
+            microversion = cls._get_microversion(session)
 
         if base_path is None:
             base_path = cls.base_path
diff --git a/openstack/shared_file_system/v2/share.py b/openstack/shared_file_system/v2/share.py
index 621ea729d..8ec1fbe85 100644
--- a/openstack/shared_file_system/v2/share.py
+++ b/openstack/shared_file_system/v2/share.py
@@ -107,13 +107,13 @@ class Share(resource.Resource, metadata.MetadataMixin):
     #: Display description for updating description
     display_description = resource.Body("display_description", type=str)
 
-    def _action(self, session, body, action='patch', microversion=None):
+    def _action(self, session, body, microversion=None):
         """Perform share instance actions given the message body"""
         url = utils.urljoin(self.base_path, self.id, 'action')
         headers = {'Accept': ''}
 
         if microversion is None:
-            microversion = self._get_microversion(session, action=action)
+            microversion = self._get_microversion(session)
 
         response = session.post(
             url, json=body, headers=headers, microversion=microversion
diff --git a/openstack/shared_file_system/v2/share_access_rule.py b/openstack/shared_file_system/v2/share_access_rule.py
index 792cc8100..06cc78a84 100644
--- a/openstack/shared_file_system/v2/share_access_rule.py
+++ b/openstack/shared_file_system/v2/share_access_rule.py
@@ -63,11 +63,11 @@ class ShareAccessRule(resource.Resource):
     #: Reason for placing the loc
     lock_reason = resource.Body("lock_reason", type=bool)
 
-    def _action(self, session, body, url, action='patch', microversion=None):
+    def _action(self, session, body, url, microversion=None):
         headers = {'Accept': ''}
 
         if microversion is None:
-            microversion = self._get_microversion(session, action=action)
+            microversion = self._get_microversion(session)
 
         return session.post(
             url, json=body, headers=headers, microversion=microversion
diff --git a/openstack/shared_file_system/v2/share_group_snapshot.py b/openstack/shared_file_system/v2/share_group_snapshot.py
index 85b86ab95..504efc38e 100644
--- a/openstack/shared_file_system/v2/share_group_snapshot.py
+++ b/openstack/shared_file_system/v2/share_group_snapshot.py
@@ -59,16 +59,14 @@ class ShareGroupSnapshot(resource.Resource):
     #: NFS, CIFS, GlusterFS, HDFS, CephFS or MAPRFS.
     share_protocol = resource.Body("share_proto", type=str)
 
-    def _action(self, session, body, action='patch', microversion=None):
+    def _action(self, session, body, microversion=None):
         """Perform ShareGroupSnapshot actions given the message body."""
         # NOTE: This is using ShareGroupSnapshot.base_path instead of
         # self.base_path as ShareGroupSnapshot instances can be acted on,
         # but the URL used is sans any additional /detail/ part.
         url = utils.urljoin(self.base_path, self.id, 'action')
         headers = {'Accept': ''}
-        microversion = microversion or self._get_microversion(
-            session, action=action
-        )
+        microversion = microversion or self._get_microversion(session)
         extra_attrs = {'microversion': microversion}
         session.post(url, json=body, headers=headers, **extra_attrs)
 
@@ -78,9 +76,7 @@ class ShareGroupSnapshot(resource.Resource):
 
     def get_members(self, session, microversion=None):
         url = utils.urljoin(self.base_path, self.id, 'members')
-        microversion = microversion or self._get_microversion(
-            session, action='list'
-        )
+        microversion = microversion or self._get_microversion(session)
         headers = {'Accept': ''}
         response = session.get(url, headers=headers, microversion=microversion)
         return response.json()
diff --git a/openstack/shared_file_system/v2/share_instance.py b/openstack/shared_file_system/v2/share_instance.py
index a0d7bd056..93f3b7fe7 100644
--- a/openstack/shared_file_system/v2/share_instance.py
+++ b/openstack/shared_file_system/v2/share_instance.py
@@ -57,7 +57,7 @@ class ShareInstance(resource.Resource):
     #: The share or share instance status.
     status = resource.Body("status", type=str)
 
-    def _action(self, session, body, action='patch', microversion=None):
+    def _action(self, session, body, microversion=None):
         """Perform share instance actions given the message body"""
         url = utils.urljoin(self.base_path, self.id, 'action')
         headers = {'Accept': ''}
@@ -66,9 +66,7 @@ class ShareInstance(resource.Resource):
             # Set microversion override
             extra_attrs['microversion'] = microversion
         else:
-            extra_attrs['microversion'] = self._get_microversion(
-                session, action=action
-            )
+            extra_attrs['microversion'] = self._get_microversion(session)
         response = session.post(url, json=body, headers=headers, **extra_attrs)
         exceptions.raise_from_response(response)
         return response
@@ -81,4 +79,4 @@ class ShareInstance(resource.Resource):
     def force_delete(self, session):
         """Force delete share instance"""
         body = {"force_delete": None}
-        self._action(session, body, action='delete')
+        self._action(session, body)
diff --git a/openstack/tests/unit/shared_file_system/v2/test_share.py b/openstack/tests/unit/shared_file_system/v2/test_share.py
index 61f98fdce..9fd4c6eea 100644
--- a/openstack/tests/unit/shared_file_system/v2/test_share.py
+++ b/openstack/tests/unit/shared_file_system/v2/test_share.py
@@ -144,7 +144,7 @@ class TestShareActions(TestShares):
 
     def test_shrink_share(self):
         sot = share.Share(**EXAMPLE)
-        microversion = sot._get_microversion(self.sess, action='patch')
+        microversion = sot._get_microversion(self.sess)
 
         self.assertIsNone(sot.shrink_share(self.sess, new_size=1))
 
@@ -158,7 +158,7 @@ class TestShareActions(TestShares):
 
     def test_extend_share(self):
         sot = share.Share(**EXAMPLE)
-        microversion = sot._get_microversion(self.sess, action='patch')
+        microversion = sot._get_microversion(self.sess)
 
         self.assertIsNone(sot.extend_share(self.sess, new_size=3))
 
@@ -172,7 +172,7 @@ class TestShareActions(TestShares):
 
     def test_revert_to_snapshot(self):
         sot = share.Share(**EXAMPLE)
-        microversion = sot._get_microversion(self.sess, action='patch')
+        microversion = sot._get_microversion(self.sess)
 
         self.assertIsNone(sot.revert_to_snapshot(self.sess, "fake_id"))
 
@@ -220,7 +220,7 @@ class TestShareActions(TestShares):
 
     def test_unmanage_share(self):
         sot = share.Share(**EXAMPLE)
-        microversion = sot._get_microversion(self.sess, action='patch')
+        microversion = sot._get_microversion(self.sess)
 
         self.assertIsNone(sot.unmanage(self.sess))
 
diff --git a/openstack/tests/unit/shared_file_system/v2/test_share_instance.py b/openstack/tests/unit/shared_file_system/v2/test_share_instance.py
index 6d9be78ef..cb461ffa8 100644
--- a/openstack/tests/unit/shared_file_system/v2/test_share_instance.py
+++ b/openstack/tests/unit/shared_file_system/v2/test_share_instance.py
@@ -96,7 +96,7 @@ class TestShareInstanceActions(TestShareInstances):
 
     def test_reset_status(self):
         sot = share_instance.ShareInstance(**EXAMPLE)
-        microversion = sot._get_microversion(self.sess, action='patch')
+        microversion = sot._get_microversion(self.sess)
 
         self.assertIsNone(sot.reset_status(self.sess, 'active'))
 
@@ -109,7 +109,7 @@ class TestShareInstanceActions(TestShareInstances):
 
     def test_force_delete(self):
         sot = share_instance.ShareInstance(**EXAMPLE)
-        microversion = sot._get_microversion(self.sess, action='delete')
+        microversion = sot._get_microversion(self.sess)
 
         self.assertIsNone(sot.force_delete(self.sess))