diff --git a/tests/conftest.py b/tests/conftest.py
index 1572fb9..b7d1a9c 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -72,7 +72,7 @@ def study_assets(
         AssetNotFoundError: If the study or expected study assets are not found
         in the resource directory.
     """
-    module_path = Path(request.fspath)
+    module_path = Path(request.fspath)  # type: ignore
     assets_dir = module_path.parent.joinpath(module_path.stem.replace("test_", ""))
     asset_dir = assets_dir.joinpath(request.node.name.replace("test_", ""))
     zip_files = list(asset_dir.glob("*.zip"))
diff --git a/tests/helpers.py b/tests/helpers.py
index 9a2946a..df8010a 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -5,7 +5,7 @@
 DEFAULT_IGNORES = frozenset(filecmp.DEFAULT_IGNORES) | {"study.ico"}
 
 
-def are_same_dir(dir1: Path, dir2: Path, *, ignore: t.Sequence[str] = DEFAULT_IGNORES) -> bool:
+def are_same_dir(dir1: Path, dir2: Path, *, ignore: t.Collection[str] = DEFAULT_IGNORES) -> bool:
     """
     Compare two directories recursively.
     """
diff --git a/tests/show_app/test_show_app.py b/tests/show_app/test_show_app.py
index 105a22b..1476b0f 100644
--- a/tests/show_app/test_show_app.py
+++ b/tests/show_app/test_show_app.py
@@ -1,10 +1,14 @@
 import dataclasses
 import datetime
+import typing as t
 from pathlib import Path
 
 from antares.study.version.show_app import ShowApp
 from antares.study.version.upgrade_app import scenarios
 
+if t.TYPE_CHECKING:
+    from antares.study.version import StudyVersion
+
 STUDY_ANTARES_FILE_0600 = """\
 [antares]
 caption = Thermal fleet optimization
@@ -31,7 +35,7 @@ def test_study_antares(self, study_dir: Path) -> None:
     def test_available_upgrades(self, study_dir: Path) -> None:
         app = ShowApp(study_dir)
         actual = app.available_upgrades
-        expected = []
+        expected: t.List[StudyVersion] = []
         assert actual == expected
 
         # patch version