diff --git a/tests/integration/test_version.py b/tests/integration/test_version.py
index 79bfd61b3..140b72970 100644
--- a/tests/integration/test_version.py
+++ b/tests/integration/test_version.py
@@ -5,7 +5,7 @@
 from version import __version__
 
 
-def read_version_from_pyproject():
+def read_version_from_pyproject() -> str:
     """Read version from pyproject.toml file."""
     # it is not safe to just try to read version from pyproject.toml file directly
     # the PDM tool itself is able to retrieve the version, even if the version
@@ -18,7 +18,7 @@ def read_version_from_pyproject():
     return completed.stdout.decode("utf-8").strip()
 
 
-def test_version_handling():
+def test_version_handling() -> None:
     """Test how version is handled by the project."""
     source_version = __version__
     project_version = read_version_from_pyproject()
diff --git a/tests/unit/test_lightspeed_stack.py b/tests/unit/test_lightspeed_stack.py
index 6f6ed41d7..2a86a33be 100644
--- a/tests/unit/test_lightspeed_stack.py
+++ b/tests/unit/test_lightspeed_stack.py
@@ -3,7 +3,7 @@
 from lightspeed_stack import create_argument_parser
 
 
-def test_create_argument_parser():
+def test_create_argument_parser() -> None:
     """Test for create_argument_parser function."""
     arg_parser = create_argument_parser()
     # nothing more to test w/o actual parsing is done
diff --git a/tests/unit/utils/test_suid.py b/tests/unit/utils/test_suid.py
index b9c440882..65722d299 100644
--- a/tests/unit/utils/test_suid.py
+++ b/tests/unit/utils/test_suid.py
@@ -6,20 +6,20 @@
 class TestSUID:
     """Unit tests for functions defined in utils.suid module."""
 
-    def test_get_suid(self):
+    def test_get_suid(self) -> None:
         """Test that get_suid generates a valid UUID."""
         suid_value = suid.get_suid()
         assert suid.check_suid(suid_value), "Generated SUID is not valid"
         assert isinstance(suid_value, str), "SUID should be a string"
 
-    def test_check_suid_valid(self):
+    def test_check_suid_valid(self) -> None:
         """Test that check_suid returns True for a valid UUID."""
         valid_suid = "123e4567-e89b-12d3-a456-426614174000"
         assert suid.check_suid(
             valid_suid
         ), "check_suid should return True for a valid SUID"
 
-    def test_check_suid_invalid(self):
+    def test_check_suid_invalid(self) -> None:
         """Test that check_suid returns False for an invalid UUID."""
         invalid_suid = "invalid-uuid"
         assert not suid.check_suid(