diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index d37b384..cc9b8f1 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -41,6 +41,6 @@ jobs:
               python tools/dump_localstorage.py --help
               python tools/dump_sessionstorage.py --help
       - name: Calculate diff 👽
-        run: | 
+        run: |
             git diff --no-index --word-diff .\forensicsim-data\expected-result\jane_doe_v_1_4_00_11161.json jane_doe_v_1_4_00_11161.json
             git diff --no-index --word-diff .\forensicsim-data\expected-result\john_doe_v_1_4_00_11161.json john_doe_v_1_4_00_11161.json
diff --git a/pyproject.toml b/pyproject.toml
index 802acd5..ef39a50 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ dev=[
 python_version = "3.9"
 
 exclude = [
-    "tools/"
+    "tools/**.py"
 ]
 
 # https://github.com/python/mypy/issues/2410
diff --git a/src/forensicsim/backend.py b/src/forensicsim/backend.py
index 7c2b6b0..002dfd3 100644
--- a/src/forensicsim/backend.py
+++ b/src/forensicsim/backend.py
@@ -284,5 +284,4 @@ def write_results_to_json(data: object, outputpath: Path) -> None:
 def parse_json() -> Any:
     # read data from a file. This is only for testing purpose.
     with Path("teams.json").open() as json_file:
-        data = json.load(json_file)
-    return data
+        return json.load(json_file)