diff --git a/stubs/pyinstaller/METADATA.toml b/stubs/pyinstaller/METADATA.toml
index deef13f4f67f..909efab1715d 100644
--- a/stubs/pyinstaller/METADATA.toml
+++ b/stubs/pyinstaller/METADATA.toml
@@ -1,2 +1,2 @@
-version = "6.20.*"
+version = "6.21.*"
 upstream-repository = "https://github.com/pyinstaller/pyinstaller"
diff --git a/stubs/pyinstaller/PyInstaller/compat.pyi b/stubs/pyinstaller/PyInstaller/compat.pyi
index 24b2864d2b64..02a3113ffe6f 100644
--- a/stubs/pyinstaller/PyInstaller/compat.pyi
+++ b/stubs/pyinstaller/PyInstaller/compat.pyi
@@ -10,12 +10,13 @@ is_py35: Final = True
 is_py36: Final = True
 is_py37: Final = True
 is_py38: Final = True
-is_py39: Final[bool]
-is_py310: Final[bool]
+is_py39: Final = True
+is_py310: Final = True
 is_py311: Final[bool]
 is_py312: Final[bool]
 is_py313: Final[bool]
 is_py314: Final[bool]
+is_py315: Final[bool]
 is_win: Final[bool]
 is_win_10: Final[bool]
 is_win_11: Final[bool]