diff --git a/slack_sdk/http_retry/__init__.py b/slack_sdk/http_retry/__init__.py
index b7116dad9..17b04acfa 100644
--- a/slack_sdk/http_retry/__init__.py
+++ b/slack_sdk/http_retry/__init__.py
@@ -4,6 +4,7 @@
 from .builtin_handlers import (
     ConnectionErrorRetryHandler,
     RateLimitErrorRetryHandler,
+    ServerErrorRetryHandler,
 )
 from .interval_calculator import RetryIntervalCalculator
 from .builtin_interval_calculators import (
@@ -17,6 +18,7 @@
 
 connect_error_retry_handler = ConnectionErrorRetryHandler()
 rate_limit_error_retry_handler = RateLimitErrorRetryHandler()
+server_error_retry_handler = ServerErrorRetryHandler()
 
 
 def default_retry_handlers() -> List[RetryHandler]:
@@ -27,6 +29,7 @@ def all_builtin_retry_handlers() -> List[RetryHandler]:
     return [
         connect_error_retry_handler,
         rate_limit_error_retry_handler,
+        server_error_retry_handler,
     ]
 
 
@@ -34,6 +37,7 @@ def all_builtin_retry_handlers() -> List[RetryHandler]:
     "RetryHandler",
     "ConnectionErrorRetryHandler",
     "RateLimitErrorRetryHandler",
+    "ServerErrorRetryHandler",
     "RetryIntervalCalculator",
     "FixedValueRetryIntervalCalculator",
     "BackoffRetryIntervalCalculator",
diff --git a/slack_sdk/http_retry/async_handler.py b/slack_sdk/http_retry/async_handler.py
index ed9f6115a..e16ba3286 100644
--- a/slack_sdk/http_retry/async_handler.py
+++ b/slack_sdk/http_retry/async_handler.py
@@ -80,6 +80,7 @@ async def prepare_for_next_attempt_async(
 
 
 __all__ = [
+    "AsyncRetryHandler",
     "RetryState",
     "HttpRequest",
     "HttpResponse",
diff --git a/tests/slack_sdk/http_retry/test_builtins.py b/tests/slack_sdk/http_retry/test_builtins.py
index 49394bb30..4918e63a8 100644
--- a/tests/slack_sdk/http_retry/test_builtins.py
+++ b/tests/slack_sdk/http_retry/test_builtins.py
@@ -17,11 +17,11 @@ def test_default_ones(self):
         self.assertEqual(1, len(list))
 
         list = all_builtin_retry_handlers()
-        self.assertEqual(2, len(list))
+        self.assertEqual(3, len(list))
         list.clear()
         self.assertEqual(0, len(list))
         list = all_builtin_retry_handlers()
-        self.assertEqual(2, len(list))
+        self.assertEqual(3, len(list))
 
     def test_fixed_value_retry_interval_calculator(self):
         for fixed_value in [0.1, 0.2]: