diff --git a/leicacam/cam.py b/leicacam/cam.py
index e6be28e..0ee3d3a 100644
--- a/leicacam/cam.py
+++ b/leicacam/cam.py
@@ -41,7 +41,6 @@ def debug(msg):
         except KeyError:
             pass
 
-
 else:
     debug = logger(pydebug.debug("leicacam"))  # pylint: disable=invalid-name
 
diff --git a/requirements_lint.txt b/requirements_lint.txt
index 118f861..baf1ca2 100644
--- a/requirements_lint.txt
+++ b/requirements_lint.txt
@@ -1,4 +1,4 @@
-black==21.11b1
+black==21.12b0
 flake8==4.0.1
 flake8-docstrings==1.6.0
 pylint==2.12.2