diff --git a/tests/test_maximize.py b/tests/test_maximize.py
index 7618167..3b84cc1 100644
--- a/tests/test_maximize.py
+++ b/tests/test_maximize.py
@@ -15,12 +15,12 @@ def test_non_max_incumbent():
     subprocess.call(["python", "examples/branin.py", "--config-name=branin_rs", "-m"])
     assert Path("./tmp/branin_rs").exists(), "Run directory not created"
     runhistory = pd.read_csv("./tmp/branin_rs/runhistory.csv")
-    with open(Path("./tmp/branin_rs/incumbent.json")) as f:
-        last_line = f.readlines()[-1]
-        incumbent = json.loads(last_line)
-    assert np.round(incumbent["score"], decimals=3) == np.round(
+    incumbent = pd.read_csv("./tmp/branin_rs/incumbent.csv")
+    incumbent = incumbent.iloc[-1]
+
+    assert np.round(incumbent["performance"], decimals=3) == np.round(
         runhistory["performance"].min(), decimals=3
-    ), "Incumbent is not the minimum score in the runhistory"
+    ), "Incumbent is not the minimum performance in the runhistory"
     shutil.rmtree("./tmp")
 
 
@@ -30,12 +30,12 @@ def test_max_incumbent():
     )
     assert Path("./tmp/branin_rs").exists(), "Run directory not created"
     runhistory = pd.read_csv("./tmp/branin_rs/runhistory.csv")
-    with open(Path("./tmp/branin_rs/incumbent.json")) as f:
-        last_line = f.readlines()[-1]
-        incumbent = json.loads(last_line)
-    print(incumbent["score"], runhistory["performance"].max(), runhistory.performance.min())
+    incumbent = pd.read_csv("./tmp/branin_rs/incumbent.csv")
+    incumbent = incumbent.iloc[-1]
+
+    print(incumbent["performance"], runhistory["performance"].max(), runhistory.performance.min())
     print(runhistory.values)
-    assert np.round(incumbent["score"], decimals=3) == np.round(
+    assert np.round(incumbent["performance"], decimals=3) == np.round(
         runhistory["performance"].max(), decimals=3
     ), "Incumbent is not the maximum score in the runhistory even though maximize is enabled"
     shutil.rmtree("./tmp")