diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c7f416e..098441a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -23,7 +23,7 @@ repos:
       - id: isort
         name: isort (python)
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.26.0
+    rev: v2.28.0
     hooks:
     -   id: pyupgrade
         args: [--py37-plus]
diff --git a/vdirsyncer/storage/dav.py b/vdirsyncer/storage/dav.py
index 6ea87cd..21588ad 100644
--- a/vdirsyncer/storage/dav.py
+++ b/vdirsyncer/storage/dav.py
@@ -851,7 +851,7 @@ class CalDAVStorage(DAVStorage):
             # instead?
             #
             # See https://github.com/dmfs/tasks/issues/118 for backstory.
-            async for href, etag in DAVStorage.list(self):
+            async for href, etag in super().list():
                 yield href, etag
 
         data = """<?xml version="1.0" encoding="utf-8" ?>