diff --git a/src/probeinterface/neuropixels_tools.py b/src/probeinterface/neuropixels_tools.py
index ed80069..2472206 100644
--- a/src/probeinterface/neuropixels_tools.py
+++ b/src/probeinterface/neuropixels_tools.py
@@ -28,7 +28,8 @@ def _load_np_probe_features():
     global _np_probe_features
     if _np_probe_features is None:
         probe_features_filepath = Path(__file__).absolute().parent / Path("resources/neuropixels_probe_features.json")
-        _np_probe_features = json.load(open(probe_features_filepath, "r"))
+        with open(probe_features_filepath, "r") as f:
+            _np_probe_features = json.load(f)
     return _np_probe_features
 
 
diff --git a/src/probeinterface/testing.py b/src/probeinterface/testing.py
index 34111da..f247ace 100644
--- a/src/probeinterface/testing.py
+++ b/src/probeinterface/testing.py
@@ -4,7 +4,8 @@
 from probeinterface import __version__ as version
 
 json_schema_file = Path(__file__).absolute().parent / "schema" / "probe.json.schema"
-schema = json.load(open(json_schema_file, "r"))
+with open(json_schema_file, "r") as f:
+    schema = json.load(f)
 
 
 def validate_probe_dict(probe_dict):