diff --git a/.github/workflows/deploy_mkdocs.yml b/.github/workflows/deploy_mkdocs.yml
index 833c1021..3606d654 100644
--- a/.github/workflows/deploy_mkdocs.yml
+++ b/.github/workflows/deploy_mkdocs.yml
@@ -20,10 +20,10 @@ jobs:
       - name: Checkout main
         uses: actions/checkout@v4
 
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Install dependencies
         run: |
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f29766ff..4d555b72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Added
+
+### Changed
+
+### Fixed
+
 ## [v4.0.0a0]
 
 ### Added
@@ -22,6 +28,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Fixed
 - Improved performance of `mk_actions` and `filter-links` methods [#351](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/351)
+- Fixed inheritance relating to BaseDatabaseSettings and ApiBaseSettings [#355](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/355)
+- Fixed delete_item and delete_collection methods return types [#355](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/355)
+- Fixed inheritance relating to DatabaseLogic and BaseDatabaseLogic, and ApiBaseSettings [#355](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/355)
 
 ## [v3.2.5] - 2025-04-07
 
diff --git a/stac_fastapi/core/stac_fastapi/core/core.py b/stac_fastapi/core/stac_fastapi/core/core.py
index 1e96c371..16197da3 100644
--- a/stac_fastapi/core/stac_fastapi/core/core.py
+++ b/stac_fastapi/core/stac_fastapi/core/core.py
@@ -745,9 +745,7 @@ async def update_item(
         return ItemSerializer.db_to_stac(item, base_url)
 
     @overrides
-    async def delete_item(
-        self, item_id: str, collection_id: str, **kwargs
-    ) -> Optional[stac_types.Item]:
+    async def delete_item(self, item_id: str, collection_id: str, **kwargs) -> None:
         """Delete an item from a collection.
 
         Args:
@@ -755,7 +753,7 @@ async def delete_item(
             collection_id (str): The identifier of the collection that contains the item.
 
         Returns:
-            Optional[stac_types.Item]: The deleted item, or `None` if the item was successfully deleted.
+            None: Returns 204 No Content on successful deletion
         """
         await self.database.delete_item(item_id=item_id, collection_id=collection_id)
         return None
@@ -825,23 +823,20 @@ async def update_collection(
         )
 
     @overrides
-    async def delete_collection(
-        self, collection_id: str, **kwargs
-    ) -> Optional[stac_types.Collection]:
+    async def delete_collection(self, collection_id: str, **kwargs) -> None:
         """
         Delete a collection.
 
         This method deletes an existing collection in the database.
 
         Args:
-            collection_id (str): The identifier of the collection that contains the item.
-            kwargs: Additional keyword arguments.
+            collection_id (str): The identifier of the collection to delete
 
         Returns:
-            None.
+            None: Returns 204 No Content on successful deletion
 
         Raises:
-            NotFoundError: If the collection doesn't exist.
+            NotFoundError: If the collection doesn't exist
         """
         await self.database.delete_collection(collection_id=collection_id)
         return None
diff --git a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py
index 0b1bcb5e..d14295f4 100644
--- a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py
+++ b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py
@@ -7,6 +7,7 @@
 import certifi
 
 from elasticsearch import AsyncElasticsearch, Elasticsearch  # type: ignore
+from stac_fastapi.core.base_settings import ApiBaseSettings
 from stac_fastapi.types.config import ApiSettings
 
 
@@ -69,7 +70,7 @@ def _es_config() -> Dict[str, Any]:
 _forbidden_fields: Set[str] = {"type"}
 
 
-class ElasticsearchSettings(ApiSettings):
+class ElasticsearchSettings(ApiSettings, ApiBaseSettings):
     """API settings."""
 
     # Fields which are defined by STAC but not included in the database model
@@ -82,7 +83,7 @@ def create_client(self):
         return Elasticsearch(**_es_config())
 
 
-class AsyncElasticsearchSettings(ApiSettings):
+class AsyncElasticsearchSettings(ApiSettings, ApiBaseSettings):
     """API settings."""
 
     # Fields which are defined by STAC but not included in the database model
diff --git a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py
index c46b208d..38d05e29 100644
--- a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py
+++ b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py
@@ -12,6 +12,7 @@
 from starlette.requests import Request
 
 from elasticsearch import exceptions, helpers  # type: ignore
+from stac_fastapi.core.base_database_logic import BaseDatabaseLogic
 from stac_fastapi.core.database_logic import (
     COLLECTIONS_INDEX,
     DEFAULT_SORT,
@@ -124,7 +125,7 @@ async def delete_item_index(collection_id: str):
 
 
 @attr.s
-class DatabaseLogic:
+class DatabaseLogic(BaseDatabaseLogic):
     """Database logic."""
 
     client = AsyncElasticsearchSettings().create_client
diff --git a/stac_fastapi/opensearch/stac_fastapi/opensearch/config.py b/stac_fastapi/opensearch/stac_fastapi/opensearch/config.py
index 01551d94..6de2ab91 100644
--- a/stac_fastapi/opensearch/stac_fastapi/opensearch/config.py
+++ b/stac_fastapi/opensearch/stac_fastapi/opensearch/config.py
@@ -6,6 +6,7 @@
 import certifi
 from opensearchpy import AsyncOpenSearch, OpenSearch
 
+from stac_fastapi.core.base_settings import ApiBaseSettings
 from stac_fastapi.types.config import ApiSettings
 
 
@@ -67,7 +68,7 @@ def _es_config() -> Dict[str, Any]:
 _forbidden_fields: Set[str] = {"type"}
 
 
-class OpensearchSettings(ApiSettings):
+class OpensearchSettings(ApiSettings, ApiBaseSettings):
     """API settings."""
 
     # Fields which are defined by STAC but not included in the database model
@@ -80,7 +81,7 @@ def create_client(self):
         return OpenSearch(**_es_config())
 
 
-class AsyncOpensearchSettings(ApiSettings):
+class AsyncOpensearchSettings(ApiSettings, ApiBaseSettings):
     """API settings."""
 
     # Fields which are defined by STAC but not included in the database model
diff --git a/stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py b/stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py
index 7bb7ac33..22e6ffe0 100644
--- a/stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py
+++ b/stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py
@@ -15,6 +15,7 @@
 from starlette.requests import Request
 
 from stac_fastapi.core import serializers
+from stac_fastapi.core.base_database_logic import BaseDatabaseLogic
 from stac_fastapi.core.database_logic import (
     COLLECTIONS_INDEX,
     DEFAULT_SORT,
@@ -145,7 +146,7 @@ async def delete_item_index(collection_id: str):
 
 
 @attr.s
-class DatabaseLogic:
+class DatabaseLogic(BaseDatabaseLogic):
     """Database logic."""
 
     client = AsyncSearchSettings().create_client