diff --git a/mockseries/main.py b/mockseries/main.py
index 18be130..ee0e254 100644
--- a/mockseries/main.py
+++ b/mockseries/main.py
@@ -1,4 +1,5 @@
 """CLI interface."""
+
 import argparse
 
 
diff --git a/mockseries/utils/timedeltas.py b/mockseries/utils/timedeltas.py
index 5f58e15..59f4862 100644
--- a/mockseries/utils/timedeltas.py
+++ b/mockseries/utils/timedeltas.py
@@ -1,4 +1,5 @@
 """Handy constants for common granularities/periods."""
+
 from datetime import timedelta
 
 MICRO_SECOND = timedelta(microseconds=1)