diff --git a/tests/storage/test_memory.py b/tests/storage/test_memory.py
index 51e576a..d180897 100644
--- a/tests/storage/test_memory.py
+++ b/tests/storage/test_memory.py
@@ -6,7 +6,6 @@ from . import StorageTests
 
 
 class TestMemoryStorage(StorageTests):
-
     storage_class = MemoryStorage
     supports_collections = False
 
diff --git a/tests/storage/test_singlefile.py b/tests/storage/test_singlefile.py
index cc049bc..9e838aa 100644
--- a/tests/storage/test_singlefile.py
+++ b/tests/storage/test_singlefile.py
@@ -6,7 +6,6 @@ from . import StorageTests
 
 
 class TestSingleFileStorage(StorageTests):
-
     storage_class = SingleFileStorage
     supports_metadata = False
 
diff --git a/tests/system/cli/test_sync.py b/tests/system/cli/test_sync.py
index d69b4c2..9deee66 100644
--- a/tests/system/cli/test_sync.py
+++ b/tests/system/cli/test_sync.py
@@ -278,7 +278,6 @@ def test_multiple_pairs(tmpdir, runner):
     ],
 )
 def test_create_collections(collections, tmpdir, runner):
-
     runner.write_with_general(
         dedent(
             """
diff --git a/vdirsyncer/cli/__init__.py b/vdirsyncer/cli/__init__.py
index 703c1eb..37d05c7 100644
--- a/vdirsyncer/cli/__init__.py
+++ b/vdirsyncer/cli/__init__.py
@@ -165,7 +165,6 @@ def metasync(ctx, collections):
 
     async def main(collection_names):
         async with aiohttp.TCPConnector(limit_per_host=16) as conn:
-
             for pair_name, collections in collection_names:
                 collections = prepare_pair(
                     pair_name=pair_name,
diff --git a/vdirsyncer/storage/filesystem.py b/vdirsyncer/storage/filesystem.py
index bf29d3f..4992bc1 100644
--- a/vdirsyncer/storage/filesystem.py
+++ b/vdirsyncer/storage/filesystem.py
@@ -18,7 +18,6 @@ logger = logging.getLogger(__name__)
 
 
 class FilesystemStorage(Storage):
-
     storage_name = "filesystem"
     _repr_attributes = ["path"]
 
diff --git a/vdirsyncer/storage/memory.py b/vdirsyncer/storage/memory.py
index a660009..9522b0a 100644
--- a/vdirsyncer/storage/memory.py
+++ b/vdirsyncer/storage/memory.py
@@ -10,7 +10,6 @@ def _random_string():
 
 
 class MemoryStorage(Storage):
-
     storage_name = "memory"
 
     """
diff --git a/vdirsyncer/sync/__init__.py b/vdirsyncer/sync/__init__.py
index 3582539..379c9c8 100644
--- a/vdirsyncer/sync/__init__.py
+++ b/vdirsyncer/sync/__init__.py
@@ -199,7 +199,6 @@ class Upload(Action):
         self.dest = dest
 
     async def _run_impl(self, a, b):
-
         if self.dest.storage.read_only:
             href = etag = None
         else: