diff --git a/pypfopt/plotting.py b/pypfopt/plotting.py
index 5ad4d00..3ad1e85 100644
--- a/pypfopt/plotting.py
+++ b/pypfopt/plotting.py
@@ -10,8 +10,8 @@
 """
 import warnings
 
-import numpy as np
 import matplotlib.pyplot as plt
+import numpy as np
 import scipy.cluster.hierarchy as sch
 
 from . import CLA, EfficientFrontier, exceptions, risk_models