diff --git a/TypeSaveArgParse/autoargs.py b/TypeSaveArgParse/autoargs.py
index e79fa3c..a424854 100644
--- a/TypeSaveArgParse/autoargs.py
+++ b/TypeSaveArgParse/autoargs.py
@@ -16,7 +16,15 @@
 except Exception:
     doc_parse = None
 
-from TypeSaveArgParse.utils import cast_all, class_to_str, enum_to_str, extract_sub_annotation, len_checker, translation_enum_to_str
+from TypeSaveArgParse.utils import (
+    cast_all,
+    class_to_str,
+    enum_to_str,
+    extract_sub_annotation,
+    is_union,
+    len_checker,
+    translation_enum_to_str,
+)
 
 config_help = "config file path"
 
@@ -93,7 +101,8 @@ def data_class_to_arg_parse(
         annotation = parameters[name].annotation
         # Handling :A |B |...| None (None means Optional argument)
         annotations = []
-        if get_origin(annotation) == Union:
+
+        if is_union(annotation):  # :
             for i in get_args(annotation):
                 if i == type(None):
                     can_be_none = True
@@ -231,7 +240,7 @@ def add_comments_to_yaml(cls, data: ruamel.yaml.CommentedMap, _addendum: str = "
 
         # Handling :A |B |...| None (None means Optional argument)
         annotations = []
-        if get_origin(annotation) == Union:
+        if is_union(annotation):
             for i in get_args(annotation):
                 if i != type(None):
                     annotations.append(i)
diff --git a/TypeSaveArgParse/utils.py b/TypeSaveArgParse/utils.py
index 607a741..ef9c8d4 100644
--- a/TypeSaveArgParse/utils.py
+++ b/TypeSaveArgParse/utils.py
@@ -70,7 +70,7 @@ def extract_sub_annotation(annotation):
 
 
 def _cast_all(val, annotation: types.GenericAlias, enum):  # -> tuple[Any, ...] | set[Any] | Any | list[Any]:
-    if get_origin(annotation) == Union:
+    if is_union(annotation):
         annotation = extract_sub_annotation(annotation)[0]
 
     if isinstance(val, list):
@@ -87,3 +87,7 @@ def cast_all(val, parameter: Parameter, enum):
         return val
     val_out = _cast_all(val, parameter.annotation, enum)
     return val_out
+
+
+def is_union(annotation):
+    return (hasattr(types, "UnionType") and get_origin(annotation) == types.UnionType) or get_origin(annotation) == Union
diff --git a/test/test_autoargs.py b/test/test_autoargs.py
index d0018c7..f5fbf41 100644
--- a/test/test_autoargs.py
+++ b/test/test_autoargs.py
@@ -2,6 +2,7 @@
 # coverage run -m unittest
 # coverage report
 # coverage html
+import platform
 import random
 import sys
 import unittest
@@ -15,6 +16,7 @@
 
 sys.path.append(str(Path(__file__).parent.parent.parent / "TypeSaveArgParse"))
 
+
 from TypeSaveArgParse import Class_to_ArgParse
 
 DEFAULT_STR = str(random.randint(0, 1000))
@@ -22,19 +24,6 @@
 DEFAULT_FLOAT = random.random()
 
 
-@dataclass
-class BASE_CASES(Class_to_ArgParse):
-    x: str = DEFAULT_STR
-    y: int = DEFAULT_INT
-    f: float = DEFAULT_FLOAT
-    z: Optional[int] = None
-    p: Optional[Path] = None
-    l_s: list[str] = field(default_factory=list)
-    l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
-    tup: tuple[str, ...] = field(default_factory=tuple)
-    set_: set[str] = field(default_factory=set)
-
-
 @dataclass
 class TUP_CASES(Class_to_ArgParse):
     tup: tuple[int, ...] = field(default_factory=tuple)
@@ -50,11 +39,45 @@ class Dummy_Enum(Enum):
     THIRD = auto()
 
 
-@dataclass
-class ENUM_CASES(Class_to_ArgParse):
-    enu: Dummy_Enum = Dummy_Enum.ONE
-    enu_list: Optional[list[Dummy_Enum]] = None
-    enu_list2: list[Dummy_Enum] = field(default_factory=list)
+py_version = int(platform.python_version().split(".")[1])
+if py_version <= 9:
+
+    @dataclass
+    class BASE_CASES(Class_to_ArgParse):  # type: ignore
+        x: str = DEFAULT_STR
+        y: int = DEFAULT_INT
+        f: float = DEFAULT_FLOAT
+        z: Optional[int] = None
+        p: Optional[Path] = None
+        l_s: list[str] = field(default_factory=list)
+        l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
+        tup: tuple[str, ...] = field(default_factory=tuple)
+        set_: set[str] = field(default_factory=set)
+
+    @dataclass
+    class ENUM_CASES(Class_to_ArgParse):  # type: ignore
+        enu: Dummy_Enum = Dummy_Enum.ONE
+        enu_list: Optional[list[Dummy_Enum]] = None
+        enu_list2: list[Dummy_Enum] = field(default_factory=list)
+else:
+
+    @dataclass
+    class BASE_CASES(Class_to_ArgParse):
+        x: str = DEFAULT_STR
+        y: int = DEFAULT_INT
+        f: float = DEFAULT_FLOAT
+        z: int | None = None
+        p: Path | None = None
+        l_s: list[str] = field(default_factory=list)
+        l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
+        tup: tuple[str, ...] = field(default_factory=tuple)
+        set_: set[str] = field(default_factory=set)
+
+    @dataclass
+    class ENUM_CASES(Class_to_ArgParse):
+        enu: Dummy_Enum = Dummy_Enum.ONE
+        enu_list: list[Dummy_Enum] | None = None
+        enu_list2: list[Dummy_Enum] = field(default_factory=list)
 
 
 def assert_(value, x, type_):
diff --git a/test/test_recursive.py b/test/test_recursive.py
index bf0ea06..ce01eb8 100644
--- a/test/test_recursive.py
+++ b/test/test_recursive.py
@@ -2,6 +2,7 @@
 # coverage run -m unittest
 # coverage report
 # coverage html
+import platform
 import random
 import sys
 import unittest
@@ -21,34 +22,103 @@
 DEFAULT_STR = str(random.randint(0, 1000))
 DEFAULT_INT = random.randint(-1000, 1000)
 DEFAULT_FLOAT = random.random()
+py_version = int(platform.python_version().split(".")[1])
 
 
-@dataclass
-class BASE_CASES(Class_to_ArgParse):
-    """
-    Class representing base cases for argument parsing.
+class Dummy_Enum(Enum):
+    ONE = auto()
+    SECOND = auto()
+    THIRD = auto()
 
-    Attributes:
-        x (str): String attribute with default value DEFAULT_STR.
-        y (int): Integer attribute with default value DEFAULT_INT.
-        f (float): Float attribute with default value DEFAULT_FLOAT.
-        z (Optional[int]): Optional integer attribute.
-        p (Optional[Path]): Optional Path attribute.
-        l_s (List[str]): List of strings.
-        l_i (List[int]): List of integers with default value [1, 2, 3].
-        tup (Tuple[str, ...]): Tuple of strings.
-        set_ (Set[str]): Set of strings.
-    """
 
-    x: str = DEFAULT_STR
-    y: int = DEFAULT_INT
-    f: float = DEFAULT_FLOAT
-    z: Optional[int] = None
-    p: Optional[Path] = None
-    l_s: list[str] = field(default_factory=list)
-    l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
-    tup: tuple[str, ...] = field(default_factory=tuple)
-    set_: set[str] = field(default_factory=set)
+if py_version <= 9:
+
+    @dataclass
+    class BASE_CASES(Class_to_ArgParse):  # type: ignore
+        """
+        Class representing base cases for argument parsing.
+
+        Attributes:
+            x (str): String attribute with default value DEFAULT_STR.
+            y (int): Integer attribute with default value DEFAULT_INT.
+            f (float): Float attribute with default value DEFAULT_FLOAT.
+            z (Optional[int]): Optional integer attribute.
+            p (Optional[Path]): Optional Path attribute.
+            l_s (List[str]): List of strings.
+            l_i (List[int]): List of integers with default value [1, 2, 3].
+            tup (Tuple[str, ...]): Tuple of strings.
+            set_ (Set[str]): Set of strings.
+        """
+
+        x: str = DEFAULT_STR
+        y: int = DEFAULT_INT
+        f: float = DEFAULT_FLOAT
+        z: Optional[int] = None
+        p: Optional[Path] = None
+        l_s: list[str] = field(default_factory=list)
+        l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
+        tup: tuple[str, ...] = field(default_factory=tuple)
+        set_: set[str] = field(default_factory=set)
+
+    @dataclass
+    class ENUM_CASES(Class_to_ArgParse):  # type: ignore
+        """
+        Class representing enum cases for argument parsing.
+
+        Attributes:
+            enu (Dummy_Enum): Enum attribute with default value Dummy_Enum.ONE.
+            enu_list (Optional[List[Dummy_Enum]]): Optional list of enum instances.
+            enu_list2 (List[Dummy_Enum]): List of enum instances.
+        """
+
+        enu: Dummy_Enum = Dummy_Enum.ONE
+        enu_list: Optional[list[Dummy_Enum]] = None
+        enu_list2: list[Dummy_Enum] = field(default_factory=list)
+
+
+else:
+
+    @dataclass
+    class BASE_CASES(Class_to_ArgParse):
+        """
+        Class representing base cases for argument parsing.
+
+        Attributes:
+            x (str): String attribute with default value DEFAULT_STR.
+            y (int): Integer attribute with default value DEFAULT_INT.
+            f (float): Float attribute with default value DEFAULT_FLOAT.
+            z (Optional[int]): Optional integer attribute.
+            p (Optional[Path]): Optional Path attribute.
+            l_s (List[str]): List of strings.
+            l_i (List[int]): List of integers with default value [1, 2, 3].
+            tup (Tuple[str, ...]): Tuple of strings.
+            set_ (Set[str]): Set of strings.
+        """
+
+        x: str = DEFAULT_STR
+        y: int = DEFAULT_INT
+        f: float = DEFAULT_FLOAT
+        z: int | None = None
+        p: Path | None = None
+        l_s: list[str] = field(default_factory=list)
+        l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
+        tup: tuple[str, ...] = field(default_factory=tuple)
+        set_: set[str] = field(default_factory=set)
+
+    @dataclass
+    class ENUM_CASES(Class_to_ArgParse):
+        """
+        Class representing enum cases for argument parsing.
+
+        Attributes:
+            enu (Dummy_Enum): Enum attribute with default value Dummy_Enum.ONE.
+            enu_list (Optional[List[Dummy_Enum]]): Optional list of enum instances.
+            enu_list2 (List[Dummy_Enum]): List of enum instances.
+        """
+
+        enu: Dummy_Enum = Dummy_Enum.ONE
+        enu_list: list[Dummy_Enum] | None = None
+        enu_list2: list[Dummy_Enum] = field(default_factory=list)
 
 
 @dataclass
@@ -85,37 +155,6 @@ class TUP_CASES(Class_to_ArgParse):
     tup4: tuple[int, int, int, int] = field(default_factory=tuple)
 
 
-class Dummy_Enum(Enum):
-    """
-    Class representing enum cases for argument parsing.
-
-    Attributes:
-        enu (Dummy_Enum): Enum attribute with default value Dummy_Enum.ONE.
-        enu_list (Optional[List[Dummy_Enum]]): Optional list of enum instances.
-        enu_list2 (List[Dummy_Enum]): List of enum instances.
-    """
-
-    ONE = auto()
-    SECOND = auto()
-    THIRD = auto()
-
-
-@dataclass
-class ENUM_CASES(Class_to_ArgParse):
-    """
-    Class representing enum cases for argument parsing.
-
-    Attributes:
-        enu (Dummy_Enum): Enum attribute with default value Dummy_Enum.ONE.
-        enu_list (Optional[List[Dummy_Enum]]): Optional list of enum instances.
-        enu_list2 (List[Dummy_Enum]): List of enum instances.
-    """
-
-    enu: Dummy_Enum = Dummy_Enum.ONE
-    enu_list: Optional[list[Dummy_Enum]] = None
-    enu_list2: list[Dummy_Enum] = field(default_factory=list)
-
-
 @dataclass()
 class REC(Class_to_ArgParse):
     """
diff --git a/test/test_save_load.py b/test/test_save_load.py
index 1830f81..edad0ad 100644
--- a/test/test_save_load.py
+++ b/test/test_save_load.py
@@ -2,6 +2,7 @@
 # coverage run -m unittest
 # coverage report
 # coverage html
+import platform
 import random
 import sys
 import unittest
@@ -22,6 +23,8 @@
 DEFAULT_INT = random.randint(-1000, 1000)
 DEFAULT_FLOAT = random.random()
 
+py_version = int(platform.python_version().split(".")[1])
+
 
 class Dummy_Enum(Enum):
     ONE = auto()
@@ -29,21 +32,40 @@ class Dummy_Enum(Enum):
     THIRD = auto()
 
 
-@dataclass
-class BASE_CASES(Class_to_ArgParse):
-    x: str = ""
-    y: int = -1000000
-    f: float = -0.3
-    enum: Dummy_Enum = Dummy_Enum.ONE
-    enum_tuple: tuple[Dummy_Enum, Dummy_Enum] = field(default_factory=lambda: (Dummy_Enum.ONE, Dummy_Enum.ONE))
-    z: Optional[int] = None
-    p: Optional[Path] = None
-    l_s: list[str] = field(default_factory=lambda: ["Wam", "Bam"])
-    l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
-    tup: tuple[str, ...] = field(default_factory=tuple)
-    set_s: set[str] = field(default_factory=set)
-    set_i: set[int] = field(default_factory=set)
-    b: bool = False
+if py_version <= 9:
+
+    @dataclass
+    class BASE_CASES(Class_to_ArgParse):  # type: ignore
+        x: str = ""
+        y: int = -1000000
+        f: float = -0.3
+        enum: Dummy_Enum = Dummy_Enum.ONE
+        enum_tuple: tuple[Dummy_Enum, Dummy_Enum] = field(default_factory=lambda: (Dummy_Enum.ONE, Dummy_Enum.ONE))
+        z: Optional[int] = None
+        p: Optional[Path] = None
+        l_s: list[str] = field(default_factory=lambda: ["Wam", "Bam"])
+        l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
+        tup: tuple[str, ...] = field(default_factory=tuple)
+        set_s: set[str] = field(default_factory=set)
+        set_i: set[int] = field(default_factory=set)
+        b: bool = False
+else:
+
+    @dataclass
+    class BASE_CASES(Class_to_ArgParse):
+        x: str = ""
+        y: int = -1000000
+        f: float = -0.3
+        enum: Dummy_Enum = Dummy_Enum.ONE
+        enum_tuple: tuple[Dummy_Enum, Dummy_Enum] = field(default_factory=lambda: (Dummy_Enum.ONE, Dummy_Enum.ONE))
+        z: int | None = None
+        p: Path | None = None
+        l_s: list[str] = field(default_factory=lambda: ["Wam", "Bam"])
+        l_i: list[int] = field(default_factory=lambda: [1, 2, 3])
+        tup: tuple[str, ...] = field(default_factory=tuple)
+        set_s: set[str] = field(default_factory=set)
+        set_i: set[int] = field(default_factory=set)
+        b: bool = False
 
 
 class Test_save_load(unittest.TestCase):