diff --git a/bayesian_optimization/bayesian_optimization.py b/bayesian_optimization/bayesian_optimization.py
index 60a33eb..a2bf375 100644
--- a/bayesian_optimization/bayesian_optimization.py
+++ b/bayesian_optimization/bayesian_optimization.py
@@ -333,7 +333,7 @@ def __init__(self, interleaved_runs=2, *args, **kwargs):
                                       *args, **kwargs)
                        for run in range(interleaved_runs)]
         self.rembos = cycle(self.rembos)
-        self.current_rembo = self.rembos.next()
+        self.current_rembo = next(self.rembos)
 
         self.X_ = []
         self.y_ = []
@@ -361,4 +361,4 @@ def update(self, X, y):
         self.y_.append(y)
 
         self.current_rembo.update(X, y)
-        self.current_rembo = self.rembos.next()
+        self.current_rembo = next(self.rembos)