diff --git a/tests/bloom_test.py b/tests/bloom_test.py
index 93d68d8..9a393e9 100755
--- a/tests/bloom_test.py
+++ b/tests/bloom_test.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """Unittest class"""
 
+from __future__ import annotations
+
 import hashlib
 import os
 import sys
diff --git a/tests/countingbloom_test.py b/tests/countingbloom_test.py
index 6527945..5d8f9e7 100755
--- a/tests/countingbloom_test.py
+++ b/tests/countingbloom_test.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """Unittest class"""
 
+from __future__ import annotations
+
 import hashlib
 import os
 import sys
diff --git a/tests/countingcuckoo_test.py b/tests/countingcuckoo_test.py
index e600cbc..93e505e 100755
--- a/tests/countingcuckoo_test.py
+++ b/tests/countingcuckoo_test.py
@@ -1,7 +1,8 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 """Unittest class"""
 
+from __future__ import annotations
+
 import hashlib
 import os
 import sys
diff --git a/tests/countminsketch_test.py b/tests/countminsketch_test.py
index 910e14d..827fe2c 100755
--- a/tests/countminsketch_test.py
+++ b/tests/countminsketch_test.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """Unittest class"""
 
+from __future__ import annotations
+
 import hashlib
 import os
 import sys
diff --git a/tests/cuckoo_test.py b/tests/cuckoo_test.py
index c49e23b..158e624 100755
--- a/tests/cuckoo_test.py
+++ b/tests/cuckoo_test.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """Unittest class"""
 
+from __future__ import annotations
+
 import hashlib
 import os
 import sys
diff --git a/tests/expandingbloom_test.py b/tests/expandingbloom_test.py
index 468aefa..d1ed6a4 100755
--- a/tests/expandingbloom_test.py
+++ b/tests/expandingbloom_test.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """Unittest class"""
 
+from __future__ import annotations
+
 import hashlib
 import os
 import sys
diff --git a/tests/hashes_test.py b/tests/hashes_test.py
index 2322325..3b60083 100755
--- a/tests/hashes_test.py
+++ b/tests/hashes_test.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """Unittest class"""
 
+from __future__ import annotations
+
 import hashlib
 import sys
 import unittest
diff --git a/tests/quotientfilter_test.py b/tests/quotientfilter_test.py
index f6dde1f..0c9fe54 100644
--- a/tests/quotientfilter_test.py
+++ b/tests/quotientfilter_test.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """Unittest class"""
 
+from __future__ import annotations
+
 import os
 import random
 import sys
diff --git a/tests/test_utilities.py b/tests/test_utilities.py
index 10fc721..c01d61d 100755
--- a/tests/test_utilities.py
+++ b/tests/test_utilities.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """probables utilitites tests"""
 
+from __future__ import annotations
+
 import os
 import sys
 import unittest
diff --git a/tests/utilities.py b/tests/utilities.py
index 9d0e875..802a5ef 100644
--- a/tests/utilities.py
+++ b/tests/utilities.py
@@ -1,14 +1,15 @@
 """utility functions"""
 
+from __future__ import annotations
+
 from hashlib import md5
 from pathlib import Path
-from typing import Union
 
 from probables.constants import UINT64_T_MAX
 from probables.hashes import KeyT
 
 
-def calc_file_md5(filename: Union[str, Path]) -> str:
+def calc_file_md5(filename: str | Path) -> str:
     """calc the md5 of a file"""
     with open(filename, "rb") as filepointer:
         res = filepointer.read()