diff --git a/prometheus_client/context_managers.py b/prometheus_client/context_managers.py
index 964a9304..3988ec22 100644
--- a/prometheus_client/context_managers.py
+++ b/prometheus_client/context_managers.py
@@ -1,13 +1,10 @@
-import sys
 from timeit import default_timer
 from types import TracebackType
 from typing import (
-    Any, Callable, Optional, Tuple, Type, TYPE_CHECKING, TypeVar, Union,
+    Any, Callable, Literal, Optional, Tuple, Type, TYPE_CHECKING, TypeVar,
+    Union,
 )
 
-if sys.version_info >= (3, 8, 0):
-    from typing import Literal
-
 from .decorator import decorate
 
 if TYPE_CHECKING:
@@ -23,7 +20,7 @@ def __init__(self, counter: "Counter", exception: Union[Type[BaseException], Tup
     def __enter__(self) -> None:
         pass
 
-    def __exit__(self, typ: Optional[Type[BaseException]], value: Optional[BaseException], traceback: Optional[TracebackType]) -> "Literal[False]":
+    def __exit__(self, typ: Optional[Type[BaseException]], value: Optional[BaseException], traceback: Optional[TracebackType]) -> Literal[False]:
         if isinstance(value, self._exception):
             self._counter.inc()
         return False
diff --git a/prometheus_client/exposition.py b/prometheus_client/exposition.py
index deaa6ed5..13af927b 100644
--- a/prometheus_client/exposition.py
+++ b/prometheus_client/exposition.py
@@ -38,7 +38,6 @@
 
 CONTENT_TYPE_LATEST = 'text/plain; version=0.0.4; charset=utf-8'
 """Content type of the latest text format"""
-PYTHON376_OR_NEWER = sys.version_info > (3, 7, 5)
 
 
 class _PrometheusRedirectHandler(HTTPRedirectHandler):
@@ -545,10 +544,7 @@ def _use_gateway(
 ) -> None:
     gateway_url = urlparse(gateway)
     # See https://bugs.python.org/issue27657 for details on urlparse in py>=3.7.6.
-    if not gateway_url.scheme or (
-            PYTHON376_OR_NEWER
-            and gateway_url.scheme not in ['http', 'https']
-    ):
+    if not gateway_url.scheme or gateway_url.scheme not in ['http', 'https']:
         gateway = f'http://{gateway}'
 
     gateway = gateway.rstrip('/')
diff --git a/prometheus_client/metrics.py b/prometheus_client/metrics.py
index 392e1e4d..66f51fa6 100644
--- a/prometheus_client/metrics.py
+++ b/prometheus_client/metrics.py
@@ -3,8 +3,8 @@
 import time
 import types
 from typing import (
-    Any, Callable, Dict, Iterable, List, Optional, Sequence, Tuple, Type,
-    TypeVar, Union,
+    Any, Callable, Dict, Iterable, List, Literal, Optional, Sequence, Tuple,
+    Type, TypeVar, Union,
 )
 
 from . import values  # retain this import style for testability
@@ -357,7 +357,7 @@ def __init__(self,
                  unit: str = '',
                  registry: Optional[CollectorRegistry] = REGISTRY,
                  _labelvalues: Optional[Sequence[str]] = None,
-                 multiprocess_mode: str = 'all',
+                 multiprocess_mode: Literal['all', 'liveall', 'min', 'livemin', 'max', 'livemax', 'sum', 'livesum'] = 'all',
                  ):
         self._multiprocess_mode = multiprocess_mode
         if multiprocess_mode not in self._MULTIPROC_MODES: