diff --git a/src/xfel_calibrate/calibrate.py b/src/xfel_calibrate/calibrate.py
index acb46ebea5fe274e42694940d56a40cd895938b8..ae846e389e48190532e0a7b2144c9b078932a12a 100755
--- a/src/xfel_calibrate/calibrate.py
+++ b/src/xfel_calibrate/calibrate.py
@@ -13,14 +13,14 @@ import textwrap
 import warnings
 from datetime import datetime
 from pathlib import Path
-from subprocess import DEVNULL, check_output, check_call, call
+from subprocess import DEVNULL, call, check_call, check_output
 from typing import List, Union
 
 import nbformat
 import numpy as np
+import yaml
 from jinja2 import Template
 from nbparameterise import extract_parameters, parameter_values, replace_definitions
-import yaml
 
 import cal_tools.tools
 
diff --git a/src/xfel_calibrate/nb_args.py b/src/xfel_calibrate/nb_args.py
index e4ab7786fcacfce9d25834bec8d9935ae21aeff1..a0990ce32dfd537633e4338fda19535b4164df9d 100644
--- a/src/xfel_calibrate/nb_args.py
+++ b/src/xfel_calibrate/nb_args.py
@@ -13,7 +13,7 @@ from pathlib import Path
 from typing import Any, Dict, List, Optional, Tuple
 
 import nbformat
-from nbparameterise import extract_parameters, Parameter
+from nbparameterise import Parameter, extract_parameters
 
 from .notebooks import notebooks