diff --git a/src/remu/binning.py b/src/remu/binning.py
index ce61146..d0791f9 100644
--- a/src/remu/binning.py
+++ b/src/remu/binning.py
@@ -14,7 +14,6 @@
 
 """
 
-
 from copy import deepcopy
 from tempfile import TemporaryFile
 
diff --git a/src/remu/likelihood.py b/src/remu/likelihood.py
index 3b59893..a95af45 100644
--- a/src/remu/likelihood.py
+++ b/src/remu/likelihood.py
@@ -1,6 +1,5 @@
 """Module that deals with the calculations of likelihoods."""
 
-
 import numpy as np
 from scipy import optimize, stats
 from scipy.misc import derivative
diff --git a/src/remu/matrix_utils.py b/src/remu/matrix_utils.py
index 075dbfa..6320d5f 100644
--- a/src/remu/matrix_utils.py
+++ b/src/remu/matrix_utils.py
@@ -1,6 +1,5 @@
 """Utility functions for the work with response matrices."""
 
-
 import numpy as np
 from matplotlib import pyplot as plt
 from scipy import stats
diff --git a/src/remu/migration.py b/src/remu/migration.py
index 6129c03..ea7c835 100644
--- a/src/remu/migration.py
+++ b/src/remu/migration.py
@@ -1,6 +1,5 @@
 """Module handling the creation and use of migration matrices."""
 
-
 from copy import deepcopy
 from warnings import warn
 
diff --git a/src/remu/plotting.py b/src/remu/plotting.py
index 4666762..8017639 100644
--- a/src/remu/plotting.py
+++ b/src/remu/plotting.py
@@ -13,7 +13,6 @@
 
 """
 
-
 from itertools import cycle
 
 import numpy as np