diff --git a/lib/charms/mongodb/v1/config_server_interface.py b/lib/charms/mongodb/v0/config_server_interface.py
similarity index 98%
rename from lib/charms/mongodb/v1/config_server_interface.py
rename to lib/charms/mongodb/v0/config_server_interface.py
index af89180bc..cdaa8c974 100644
--- a/lib/charms/mongodb/v1/config_server_interface.py
+++ b/lib/charms/mongodb/v0/config_server_interface.py
@@ -8,7 +8,6 @@
 """
 import logging
 
-
 from ops.charm import CharmBase, EventBase
 from ops.framework import Object
 from ops.model import WaitingStatus
@@ -22,14 +21,14 @@
 CONFIG_SERVER_URI_KEY = "config-server-uri"
 
 # The unique Charmhub library identifier, never change it
-LIBID = "55fee8fa73364fb0a2dc16a954b2fd4a"
+LIBID = "58ad1ccca4974932ba22b97781b9b2a0"
 
 # Increment this major API version when introducing breaking changes
-LIBAPI = 1
+LIBAPI = 0
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 4
+LIBPATCH = 1
 
 
 class ClusterProvider(Object):
diff --git a/src/charm.py b/src/charm.py
index d6d38766f..75b4419f6 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -20,7 +20,7 @@
 )
 from charms.mongodb.v0.mongodb_secrets import SecretCache, generate_secret_label
 from charms.mongodb.v0.mongodb_tls import MongoDBTLS
-from charms.mongodb.v1.config_server_interface import ClusterProvider
+from charms.mongodb.v0.config_server_interface import ClusterProvider
 from charms.mongodb.v1.helpers import (
     KEY_FILE,
     TLS_EXT_CA_FILE,
diff --git a/tests/unit/test_config_server_lib.py b/tests/unit/test_config_server_lib.py
index 1f47b2ab7..23150aaba 100644
--- a/tests/unit/test_config_server_lib.py
+++ b/tests/unit/test_config_server_lib.py
@@ -3,7 +3,6 @@
 import unittest
 from unittest.mock import patch
 
-from ops.model import BlockedStatus, ModelError
 from ops.testing import Harness
 
 from charm import MongodbOperatorCharm
@@ -27,13 +26,14 @@ def setUp(self):
     def test_on_relation_joined_failed_hook_checks(self, _update_relation_data):
         """Tests that no relation data is set when cluster joining conditions are not met."""
 
-        def is_role_mock_call(*args):
+        def is_not_config_mock_call(*args):
             assert args == ("config-server",)
             return False
 
         self.harness.charm.app_peer_data["db_initialised"] = "True"
 
         # fails due to being run on non-config-server
+        self.harness.charm.is_role = is_not_config_mock_call
         relation_id = self.harness.add_relation("cluster", "mongos")
         self.harness.add_relation_unit(relation_id, "mongos/0")
         _update_relation_data.assert_not_called()
@@ -41,11 +41,11 @@ def is_role_mock_call(*args):
         # fails because db has not been initialized
         del self.harness.charm.app_peer_data["db_initialised"]
 
-        def is_role_mock_call(*args):
+        def is_config_mock_call(*args):
             assert args == ("config-server",)
             return True
 
-        self.harness.charm.is_role = is_role_mock_call
+        self.harness.charm.is_role = is_config_mock_call
         self.harness.add_relation_unit(relation_id, "mongos/1")
         _update_relation_data.assert_not_called()