diff --git a/src/ai/fitness/bumpiness.py b/src/ai/fitness/bumpiness.py
index e735a0a..9e40146 100644
--- a/src/ai/fitness/bumpiness.py
+++ b/src/ai/fitness/bumpiness.py
@@ -6,7 +6,7 @@ from .peaks import get_peaks
 
 
 def get_bumpiness(
-    peaks: Optional[np.ndarray], field: Optional[np.ndarray] = None
+    *, peaks: Optional[np.ndarray] = None, field: Optional[np.ndarray] = None
 ) -> int:
     if peaks is None and field is None:
         raise ValueError("peaks and field cannot both be None")
diff --git a/src/ai/fitness/peaks.py b/src/ai/fitness/peaks.py
index ba29f2b..dd88215 100644
--- a/src/ai/fitness/peaks.py
+++ b/src/ai/fitness/peaks.py
@@ -11,7 +11,7 @@ def get_peaks(field: np.ndarray) -> np.ndarray:
 
 
 def get_peaks_max(
-    peaks: Optional[np.ndarray], field: Optional[np.ndarray] = None
+    *, peaks: Optional[np.ndarray] = None, field: Optional[np.ndarray] = None
 ) -> int:
     if peaks is None and field is None:
         raise ValueError("peaks and field cannot both be None")
@@ -21,7 +21,7 @@ def get_peaks_max(
 
 
 def get_peaks_sum(
-    peaks: Optional[np.ndarray], field: Optional[np.ndarray] = None
+    *, peaks: Optional[np.ndarray] = None, field: Optional[np.ndarray] = None
 ) -> int:
     if peaks is None and field is None:
         raise ValueError("peaks and field cannot both be None")
diff --git a/src/ai/fitness/transitions.py b/src/ai/fitness/transitions.py
index c8b3258..ba9bf9b 100644
--- a/src/ai/fitness/transitions.py
+++ b/src/ai/fitness/transitions.py
@@ -7,7 +7,7 @@ from .peaks import get_peaks, get_peaks_max
 
 def get_row_transition(field: np.ndarray, highest_peak: Optional[int] = None) -> int:
     if highest_peak is None:
-        highest_peak = get_peaks_max(None, field)
+        highest_peak = get_peaks_max(field=field)
 
     rows_to_check = slice(int(field.shape[0] - highest_peak), field.shape[0])
     transitions = np.sum(field[rows_to_check, 1:] != field[rows_to_check, :-1])
diff --git a/tests/ai/test_fitness.py b/tests/ai/test_fitness.py
index 49cbf67..c274942 100644
--- a/tests/ai/test_fitness.py
+++ b/tests/ai/test_fitness.py
@@ -2,6 +2,7 @@ import unittest
 
 import numpy as np
 from ai.fitness.bumpiness import get_bumpiness
+from ai.fitness.holes import get_holes
 from ai.fitness.peaks import get_peaks_sum
 from ai.fitness.transitions import (
     get_col_transition,
@@ -32,7 +33,7 @@ class TestFitness(unittest.TestCase):
     def test_get_peaks_sum(self) -> None:
         answers: tuple[int] = (11, 0, 2)
         for field, answer in zip(self.fields, answers):
-            self.assertEqual(get_peaks_sum(None, field), answer)
+            self.assertEqual(get_peaks_sum(field=field), answer)
 
     def test_get_row_transistions(self):
         answers = (8, 0, 2)
@@ -47,7 +48,7 @@ class TestFitness(unittest.TestCase):
     def test_get_bumpiness(self):
         answers = (5, 0, 4)
         for field, answer in zip(self.fields, answers):
-            self.assertEqual(get_bumpiness(None, field), answer)
+            self.assertEqual(get_bumpiness(field=field), answer)
 
     def test_get_holes(self):
         answers = (