diff --git a/src/xpuz/base.py b/src/xpuz/base.py
index eae6669b..51536808 100644
--- a/src/xpuz/base.py
+++ b/src/xpuz/base.py
@@ -4,7 +4,11 @@
 
 from configparser import ConfigParser
 from platform import system
-from typing import Dict, List, Union, Tuple, Callable, Literal
+from typing import Dict, List, Union, Tuple, Callable
+try:
+    from typing import Literal
+except ImportError:
+    from typing_extensions import Literal
 
 from babel import Locale
 from customtkinter import (
diff --git a/src/xpuz/constants.py b/src/xpuz/constants.py
index aebd37de..54ba8bb6 100644
--- a/src/xpuz/constants.py
+++ b/src/xpuz/constants.py
@@ -37,14 +37,11 @@
     LANG_REPLACEMENTS: Mapping of google translate language codes to their
         respective `Babel` language codes. `None` if they do not exist, otherwise,
         a string representing the `Babel`-correct code.
-    
-    
-    
 """
 
 from os import path
-from pathlib import Path, PosixPath, WindowsPath
-from typing import Dict, List, Union
+from pathlib import Path
+from typing import Dict, List, Union, Tuple
 
 from platformdirs import user_documents_dir
 from regex import Pattern, compile
@@ -92,7 +89,7 @@ class Dark:
 
 
 # Absolute paths used across the source code.
-DIR_PATH: Union[PosixPath, WindowsPath] = Path(__file__).resolve().parents[0]
+DIR_PATH: Path = Path(__file__).resolve().parents[0]
 TEMPLATE_CFG_PATH: str = path.join(DIR_PATH, "template.config.ini")
 DOC_PATH: str = user_documents_dir()
 DOC_DATA_PATH: str = path.join(DOC_PATH, "xpuz")
diff --git a/src/xpuz/utils.py b/src/xpuz/utils.py
index 55f09c38..b5826c8c 100644
--- a/src/xpuz/utils.py
+++ b/src/xpuz/utils.py
@@ -18,9 +18,12 @@
     Optional,
     Tuple,
     Union,
-    Literal,
     Any,
 )
+try:
+    from typing import Literal
+except ImportError:
+    from typing_extensions import Literal
 from urllib.error import URLError
 
 from babel import Locale