diff --git a/tempest/api/volume/admin/test_group_snapshots.py b/tempest/api/volume/admin/test_group_snapshots.py
index 0a8b56d..659e2c4 100644
--- a/tempest/api/volume/admin/test_group_snapshots.py
+++ b/tempest/api/volume/admin/test_group_snapshots.py
@@ -64,7 +64,6 @@
 class GroupSnapshotsTest(BaseGroupSnapshotsTest):
     """Test group snapshot"""
 
-    _api_version = 3
     min_microversion = '3.14'
     max_microversion = 'latest'
 
@@ -253,7 +252,6 @@
 class GroupSnapshotsV319Test(BaseGroupSnapshotsTest):
     """Test group snapshot with volume microversion greater than 3.18"""
 
-    _api_version = 3
     min_microversion = '3.19'
     max_microversion = 'latest'
 
diff --git a/tempest/api/volume/admin/test_group_type_specs.py b/tempest/api/volume/admin/test_group_type_specs.py
index 159c6fb..5c5913e 100644
--- a/tempest/api/volume/admin/test_group_type_specs.py
+++ b/tempest/api/volume/admin/test_group_type_specs.py
@@ -21,7 +21,6 @@
 class GroupTypeSpecsTest(base.BaseVolumeAdminTest):
     """Test group type specs"""
 
-    _api_version = 3
     min_microversion = '3.11'
     max_microversion = 'latest'
 
diff --git a/tempest/api/volume/admin/test_group_types.py b/tempest/api/volume/admin/test_group_types.py
index 3993020..a7a5d6f 100644
--- a/tempest/api/volume/admin/test_group_types.py
+++ b/tempest/api/volume/admin/test_group_types.py
@@ -21,7 +21,6 @@
 class GroupTypesTest(base.BaseVolumeAdminTest):
     """Test group types"""
 
-    _api_version = 3
     min_microversion = '3.11'
     max_microversion = 'latest'
 
diff --git a/tempest/api/volume/admin/test_groups.py b/tempest/api/volume/admin/test_groups.py
index e67b985..747a194 100644
--- a/tempest/api/volume/admin/test_groups.py
+++ b/tempest/api/volume/admin/test_groups.py
@@ -25,7 +25,6 @@
 class GroupsTest(base.BaseVolumeAdminTest):
     """Tests of volume groups with microversion greater than 3.12"""
 
-    _api_version = 3
     min_microversion = '3.13'
     max_microversion = 'latest'
 
@@ -156,7 +155,6 @@
 class GroupsV314Test(base.BaseVolumeAdminTest):
     """Tests of volume groups with microversion greater than 3.13"""
 
-    _api_version = 3
     min_microversion = '3.14'
     max_microversion = 'latest'
 
@@ -194,7 +192,6 @@
 class GroupsV320Test(base.BaseVolumeAdminTest):
     """Tests of volume groups with microversion greater than 3.19"""
 
-    _api_version = 3
     min_microversion = '3.20'
     max_microversion = 'latest'
 
diff --git a/tempest/api/volume/admin/test_user_messages.py b/tempest/api/volume/admin/test_user_messages.py
index 096709c..768c129 100644
--- a/tempest/api/volume/admin/test_user_messages.py
+++ b/tempest/api/volume/admin/test_user_messages.py
@@ -24,7 +24,6 @@
 class UserMessagesTest(base.BaseVolumeAdminTest):
     """Test volume messages with microversion greater than 3.2"""
 
-    _api_version = 3
     min_microversion = '3.3'
     max_microversion = 'latest'
 
diff --git a/tempest/api/volume/base.py b/tempest/api/volume/base.py
index e5620fd..4695e4b 100644
--- a/tempest/api/volume/base.py
+++ b/tempest/api/volume/base.py
@@ -32,7 +32,6 @@
     # Set this to True in subclasses to create a default network. See
     # https://bugs.launchpad.net/tempest/+bug/1844568
     create_default_network = False
-    _api_version = 2
     credentials = ['primary']
 
     @classmethod
diff --git a/tempest/api/volume/test_versions.py b/tempest/api/volume/test_versions.py
index e065bdf..578be58 100644
--- a/tempest/api/volume/test_versions.py
+++ b/tempest/api/volume/test_versions.py
@@ -19,8 +19,6 @@
 class VersionsTest(base.BaseVolumeTest):
     """Test volume versions"""
 
-    _api_version = 3
-
     @decorators.idempotent_id('77838fc4-b49b-4c64-9533-166762517369')
     @decorators.attr(type='smoke')
     def test_list_versions(self):
diff --git a/tempest/api/volume/test_volumes_backup.py b/tempest/api/volume/test_volumes_backup.py
index 2e78114..fff6a44 100644
--- a/tempest/api/volume/test_volumes_backup.py
+++ b/tempest/api/volume/test_volumes_backup.py
@@ -164,7 +164,6 @@
 class VolumesBackupsV39Test(base.BaseVolumeTest):
     """Test volumes backup with volume microversion greater than 3.8"""
 
-    _api_version = 3
     min_microversion = '3.9'
     max_microversion = 'latest'
 
diff --git a/tempest/api/volume/test_volumes_extend.py b/tempest/api/volume/test_volumes_extend.py
index 7441f1d..d9790f3 100644
--- a/tempest/api/volume/test_volumes_extend.py
+++ b/tempest/api/volume/test_volumes_extend.py
@@ -77,7 +77,6 @@
     # details once that microversion is available in Nova.
     credentials = ['primary', 'admin']
 
-    _api_version = 3
     # NOTE(mriedem): The minimum required volume API version is 3.42 and the
     # minimum required compute API microversion is 2.51, but the compute call
     # is implicit - Cinder calls Nova at that microversion, Tempest does not.
diff --git a/tempest/api/volume/test_volumes_get.py b/tempest/api/volume/test_volumes_get.py
index 91728ab..28e41bf 100644
--- a/tempest/api/volume/test_volumes_get.py
+++ b/tempest/api/volume/test_volumes_get.py
@@ -143,7 +143,6 @@
 class VolumesSummaryTest(base.BaseVolumeTest):
     """Test volume summary"""
 
-    _api_version = 3
     min_microversion = '3.12'
     max_microversion = 'latest'