diff --git a/singer_sdk/sinks/core.py b/singer_sdk/sinks/core.py
index c4cb6741d..4ccaa5d12 100644
--- a/singer_sdk/sinks/core.py
+++ b/singer_sdk/sinks/core.py
@@ -14,6 +14,7 @@
 from types import MappingProxyType
 
 import fastjsonschema
+from typing_extensions import override
 
 from singer_sdk.exceptions import (
     InvalidJSONSchema,
@@ -98,6 +99,7 @@ def __init__(
             error_message = f"Schema Validation Error: {e}"
             raise InvalidJSONSchema(error_message) from e
 
+    @override
     def validate(self, record: dict):  # noqa: ANN201
         """Validate a record message.
 
diff --git a/tests/core/sinks/test_format_checker.py b/tests/core/sinks/test_format_checker.py
index b546ba642..3f466dd55 100644
--- a/tests/core/sinks/test_format_checker.py
+++ b/tests/core/sinks/test_format_checker.py
@@ -43,9 +43,11 @@ def default_sink(target, test_schema):
     class CustomSink(Sink):
         """Custom sink class."""
 
+        @override
         def process_batch(self, context: dict) -> None:
             pass
 
+        @override
         def process_record(self, record: dict, context: dict) -> None:
             pass
 
@@ -61,9 +63,11 @@ class CustomSink(Sink):
 
         validate_field_string_format = True
 
+        @override
         def process_batch(self, context: dict) -> None:
             pass
 
+        @override
         def process_record(self, record: dict, context: dict) -> None:
             pass
 
@@ -93,9 +97,11 @@ def get_validator(self) -> BaseJSONSchemaValidator | None:
                 },
             )
 
+        @override
         def process_batch(self, context: dict) -> None:
             pass
 
+        @override
         def process_record(self, record: dict, context: dict) -> None:
             pass
 
diff --git a/tests/core/sinks/test_type_checker.py b/tests/core/sinks/test_type_checker.py
index 16a1e67b7..72f736743 100644
--- a/tests/core/sinks/test_type_checker.py
+++ b/tests/core/sinks/test_type_checker.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import pytest
+from typing_extensions import override
 
 from singer_sdk.sinks.core import BaseJSONSchemaValidator, InvalidJSONSchema, Sink
 from singer_sdk.target_base import Target
@@ -36,9 +37,11 @@ def test_default_schema_type_checks(target, test_schema_invalid):
     class CustomSink(Sink):
         """Custom sink class."""
 
+        @override
         def process_batch(self, context: dict) -> None:
             pass
 
+        @override
         def process_record(self, record: dict, context: dict) -> None:
             pass
 
@@ -55,6 +58,7 @@ def test_disable_schema_type_checks_returning_none(target, test_schema_invalid):
     class CustomSink(Sink):
         """Custom sink class."""
 
+        @override
         def get_validator(self) -> BaseJSONSchemaValidator | None:
             """Get a record validator for this sink.
 
@@ -66,9 +70,11 @@ def get_validator(self) -> BaseJSONSchemaValidator | None:
             """
             return None
 
+        @override
         def process_batch(self, context: dict) -> None:
             pass
 
+        @override
         def process_record(self, record: dict, context: dict) -> None:
             pass
 
@@ -83,9 +89,11 @@ class CustomSink(Sink):
 
         validate_schema = False
 
+        @override
         def process_batch(self, context: dict) -> None:
             pass
 
+        @override
         def process_record(self, record: dict, context: dict) -> None:
             pass