diff --git a/backend/tests/test_property.py b/backend/tests/test_property.py
index 7f7cc140..776c1491 100644
--- a/backend/tests/test_property.py
+++ b/backend/tests/test_property.py
@@ -110,7 +110,7 @@ class TestProperty:
 
         return property_instance
 
-    @pytest.fixture
+    @pytest.fixture()
     def mock_cleaner(self):
         lighting_averages = [
             {'lighting-description': 'good lighting efficiency', 'low-energy-lighting': 99.26666666666667},
diff --git a/etl/epc/tests/test_epcrecord.py b/etl/epc/tests/test_epcrecord.py
index b7d3fda4..39e1ee60 100644
--- a/etl/epc/tests/test_epcrecord.py
+++ b/etl/epc/tests/test_epcrecord.py
@@ -8,7 +8,7 @@ import random
 
 class TestEpcRecord:
 
-    @pytest.fixture
+    @pytest.fixture()
     def cleaning_data(self):
         with open("recommendations/tests/test_data/cleaning_data.pkl", "rb") as f:
             data = pickle.load(f)
diff --git a/recommendations/tests/test_heating_recommendations.py b/recommendations/tests/test_heating_recommendations.py
index 9ddc8bb7..039801e1 100644
--- a/recommendations/tests/test_heating_recommendations.py
+++ b/recommendations/tests/test_heating_recommendations.py
@@ -11,21 +11,21 @@ from recommendations.tests.test_data.heating_recommendations_data import testing
 
 class TestHeatingRecommendations:
 
-    @pytest.fixture
+    @pytest.fixture()
     def cleaning_data(self):
         with open("recommendations/tests/test_data/cleaning_data.pkl", "rb") as f:
             data = pickle.load(f)
 
         return data
 
-    @pytest.fixture
+    @pytest.fixture()
     def cleaned(self):
         with open("recommendations/tests/test_data/cleaned.pkl", "rb") as f:
             df = pickle.load(f)
 
         return df
 
-    @pytest.fixture
+    @pytest.fixture()
     def kwh_client(self):
         client = KwhData(bucket="retrofit-data-dev", read_consumption_data=False)
         # We fix this pricing table for these tests