diff --git a/src/nifreeze/model/gpr.py b/src/nifreeze/model/gpr.py
index b653994..938c799 100644
--- a/src/nifreeze/model/gpr.py
+++ b/src/nifreeze/model/gpr.py
@@ -29,7 +29,7 @@
 
 import numpy as np
 from scipy import optimize
-from scipy.optimize._minimize import Bounds
+from scipy.optimize import Bounds
 from sklearn.gaussian_process import GaussianProcessRegressor
 from sklearn.gaussian_process.kernels import (
     Hyperparameter,