diff --git a/pleskdistup/actions/grub.py b/pleskdistup/actions/grub.py
index 3383022..25cf4c1 100644
--- a/pleskdistup/actions/grub.py
+++ b/pleskdistup/actions/grub.py
@@ -5,6 +5,7 @@
 
 DEBCONF_CMD = "/usr/bin/debconf-show"
 
+
 class AssertGrubInstallDeviceExists(action.CheckAction):
     def __init__(self) -> None:
         self.name = "check GRUB installation device exists"
diff --git a/pleskdistup/main.py b/pleskdistup/main.py
index 621c08f..58999de 100644
--- a/pleskdistup/main.py
+++ b/pleskdistup/main.py
@@ -317,7 +317,6 @@ def try_lock(lock_file: PathType) -> typing.Generator[bool, None, None]:
             except Exception as ex:
                 log.warn(f"Failed to remove lockfile {lock_file!r}: {ex}")
 
-
 def exit_signal_handler(signum, frame):
     # exit will trigger blocks finalization, so lockfile will be removed
     log.info(f"Received signal {signum}, going to exit...")