diff --git a/api/.flake8 b/api/.flake8
index e4e4892..223d36c 100644
--- a/api/.flake8
+++ b/api/.flake8
@@ -1,4 +1,4 @@
 [flake8]
 max-line-length = 80
-select = C,E,F,W,B,B950
-extend-ignore = E203, E501
+extend-select = B950
+extend-ignore = E203,E501
diff --git a/api/.isort.cfg b/api/.isort.cfg
new file mode 100644
index 0000000..d056ad0
--- /dev/null
+++ b/api/.isort.cfg
@@ -0,0 +1,3 @@
+[settings]
+profile = black
+line_length = 80
diff --git a/api/advent22_api/core/depends.py b/api/advent22_api/core/depends.py
index a9423a2..15c90ab 100644
--- a/api/advent22_api/core/depends.py
+++ b/api/advent22_api/core/depends.py
@@ -24,6 +24,8 @@ from .helpers import (
     set_len,
 )
 
+RE_NUM = re.compile(r"/(\d+)\.", flags=re.IGNORECASE)
+
 
 async def get_all_sorted_days(
     cal_cfg: CalendarConfig = Depends(get_calendar_config),
@@ -109,11 +111,10 @@ async def get_all_manual_image_names(
     Bilder: "manual" zuordnen
     """
 
-    num_re = re.compile(r"/(\d+)\.", flags=re.IGNORECASE)
     return {
         int(num_match.group(1)): name
         for name in manual_image_names
-        if (num_match := num_re.search(name)) is not None
+        if (num_match := RE_NUM.search(name)) is not None
     }