diff --git a/stubs/simplejson/simplejson/__init__.pyi b/stubs/simplejson/simplejson/__init__.pyi
index dcba31704..4b61e31e3 100644
--- a/stubs/simplejson/simplejson/__init__.pyi
+++ b/stubs/simplejson/simplejson/__init__.pyi
@@ -22,7 +22,7 @@ def dumps(
     cls: type[JSONEncoder],
     indent: str | int | None = ...,
     separators: tuple[str, str] | None = ...,
-    encoding: str = ...,
+    encoding: str | None = ...,
     default: Callable[[Any], Any] | None = ...,
     use_decimal: bool = ...,
     namedtuple_as_object: bool = ...,
@@ -46,7 +46,7 @@ def dumps(
     cls: type[JSONEncoder] | None = ...,
     indent: str | int | None = ...,
     separators: tuple[str, str] | None = ...,
-    encoding: str = ...,
+    encoding: str | None = ...,
     default: Callable[[Any], Any] | None = ...,
     use_decimal: bool = ...,
     namedtuple_as_object: bool = ...,
@@ -71,7 +71,7 @@ def dump(
     cls: type[JSONEncoder],
     indent: str | int | None = ...,
     separators: tuple[str, str] | None = ...,
-    encoding: str = ...,
+    encoding: str | None = ...,
     default: Callable[[Any], Any] | None = ...,
     use_decimal: bool = ...,
     namedtuple_as_object: bool = ...,
@@ -96,7 +96,7 @@ def dump(
     cls: type[JSONEncoder] | None = ...,
     indent: str | int | None = ...,
     separators: tuple[str, str] | None = ...,
-    encoding: str = ...,
+    encoding: str | None = ...,
     default: Callable[[Any], Any] | None = ...,
     use_decimal: bool = ...,
     namedtuple_as_object: bool = ...,