diff --git a/utils/utils.py b/utils/utils.py
index 2b3ff82b..a0a29815 100755
--- a/utils/utils.py
+++ b/utils/utils.py
@@ -799,12 +799,13 @@ def kmean_anchors(path='../coco/train2017.txt', n=9, img_size=(320, 640)):
     # ax[0].plot(np.arange(1, 21), np.array(d) ** 2, marker='.')
 
     # Evolve
+    npr = np.random
     wh = torch.Tensor(wh)
-    f, sh, ng, mp, s = fitness(thr, wh, k), k.shape, 1000, 0.1, 0.3  # fitness, generations, mutation probability, sigma
+    f, sh, ng, mp, s = fitness(thr, wh, k), k.shape, 1000, 0.9, 0.1  # fitness, generations, mutation probability, sigma
     for _ in tqdm(range(ng), desc='Evolving anchors'):
         v = np.ones(sh)
         while (v == 1).all():  # mutate until a change occurs (prevent duplicates)
-            v = ((np.random.random(sh) < mp) * np.random.randn(*sh) * s + 1) ** 2.0
+            v = ((npr.random(sh) < mp) * npr.random() * npr.randn(*sh) * s + 1).clip(0.3, 3.0)  # 98.6, 61.6
         kg = (k.copy() * v).clip(min=2.0)
         fg = fitness(thr, wh, kg)
         if fg > f: