diff --git a/tests/distributions/test_base.py b/tests/distributions/test_base.py
index 6c824c6..911d01a 100644
--- a/tests/distributions/test_base.py
+++ b/tests/distributions/test_base.py
@@ -3,6 +3,7 @@
 import pytest
 
 import numpy as np
+
 from xgboost_distribution.distributions import (
     AVAILABLE_DISTRIBUTIONS,
     Normal,
diff --git a/tests/distributions/test_exponential.py b/tests/distributions/test_exponential.py
index 784c711..f8e26c5 100644
--- a/tests/distributions/test_exponential.py
+++ b/tests/distributions/test_exponential.py
@@ -2,6 +2,7 @@
 
 import numpy as np
 import pandas as pd
+
 from xgboost_distribution.distributions import Exponential
 
 
diff --git a/tests/distributions/test_laplace.py b/tests/distributions/test_laplace.py
index be9c027..7fd687b 100644
--- a/tests/distributions/test_laplace.py
+++ b/tests/distributions/test_laplace.py
@@ -1,6 +1,7 @@
 import pytest
 
 import numpy as np
+
 from xgboost_distribution.distributions import Laplace
 
 
diff --git a/tests/distributions/test_log_normal.py b/tests/distributions/test_log_normal.py
index a516586..c903fdf 100644
--- a/tests/distributions/test_log_normal.py
+++ b/tests/distributions/test_log_normal.py
@@ -2,6 +2,7 @@
 
 import numpy as np
 import pandas as pd
+
 from xgboost_distribution.distributions import LogNormal
 
 
diff --git a/tests/distributions/test_negative_binomial.py b/tests/distributions/test_negative_binomial.py
index 05ec9e2..6fcd0d7 100644
--- a/tests/distributions/test_negative_binomial.py
+++ b/tests/distributions/test_negative_binomial.py
@@ -3,6 +3,7 @@
 import numpy as np
 import pandas as pd
 from scipy.special import logit
+
 from xgboost_distribution.distributions import NegativeBinomial
 
 
diff --git a/tests/distributions/test_normal.py b/tests/distributions/test_normal.py
index f5044e1..149c9b5 100644
--- a/tests/distributions/test_normal.py
+++ b/tests/distributions/test_normal.py
@@ -1,6 +1,7 @@
 import pytest
 
 import numpy as np
+
 from xgboost_distribution.distributions import Normal
 
 
diff --git a/tests/distributions/test_poisson.py b/tests/distributions/test_poisson.py
index 12712d6..c93998e 100644
--- a/tests/distributions/test_poisson.py
+++ b/tests/distributions/test_poisson.py
@@ -2,6 +2,7 @@
 
 import numpy as np
 import pandas as pd
+
 from xgboost_distribution.distributions import Poisson
 
 
diff --git a/tests/distributions/test_utils.py b/tests/distributions/test_utils.py
index 88bffc6..ca0301a 100644
--- a/tests/distributions/test_utils.py
+++ b/tests/distributions/test_utils.py
@@ -2,6 +2,7 @@
 
 import numpy as np
 import pandas as pd
+
 from xgboost_distribution.distributions.utils import (
     check_all_ge_zero,
     check_all_gt_zero,
diff --git a/tests/test_data.py b/tests/test_data.py
index 155a501..646722f 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -3,6 +3,7 @@
 import pytest
 
 import numpy as np
+
 from xgboost_distribution.model import XGBDistribution
 
 
diff --git a/tests/test_model.py b/tests/test_model.py
index c37b3da..ff33ef0 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -8,6 +8,7 @@
 import joblib
 import numpy as np
 from sklearn.exceptions import NotFittedError
+
 from xgboost_distribution.distributions import AVAILABLE_DISTRIBUTIONS
 from xgboost_distribution.model import XGBDistribution