diff --git a/src/_zkapauthorizer/model.py b/src/_zkapauthorizer/model.py
index d3526abd09d89ced37786f6e0c26891ba5e2e80f..bccbf3d28d54d3a9cc01eb01e9b1ecea4b6180c6 100644
--- a/src/_zkapauthorizer/model.py
+++ b/src/_zkapauthorizer/model.py
@@ -357,7 +357,6 @@ class VoucherStore(object):
 
         return list(Voucher.from_row(row) for row in refs)
 
-
     @with_cursor
     def insert_unblinded_tokens_for_voucher(
         self, cursor, voucher, public_key, unblinded_tokens, completed, spendable
@@ -437,8 +436,7 @@ class VoucherStore(object):
             """,
             list(
                 (token.unblinded_token.decode("ascii"), group_id)
-                for token
-                in unblinded_tokens
+                for token in unblinded_tokens
             ),
         )
 
diff --git a/src/_zkapauthorizer/tests/test_model.py b/src/_zkapauthorizer/tests/test_model.py
index baf83b1a976b361f73b784dddaeb07f3ec380733..494e0af7940f1ecca5ae5fef42044a5069cfe1bf 100644
--- a/src/_zkapauthorizer/tests/test_model.py
+++ b/src/_zkapauthorizer/tests/test_model.py
@@ -452,7 +452,6 @@ class UnblindedTokenStateMachine(RuleBasedStateMachine):
         self.available += len(self.using)
         del self.using[:]
 
-
     @invariant()
     def unblinded_token_count(self):
         """
diff --git a/src/_zkapauthorizer/tests/test_plugin.py b/src/_zkapauthorizer/tests/test_plugin.py
index f6262978fb768fd1c27b2dac9b871c01f54fca16..f1fc566d211f985b965583ea91ede11d9046e48b 100644
--- a/src/_zkapauthorizer/tests/test_plugin.py
+++ b/src/_zkapauthorizer/tests/test_plugin.py
@@ -572,7 +572,11 @@ storage:
       - name: {name}
         ristretto-issuer-root-url: https://payments.example.com/
         storage-server-FURL: pb://bbbbbbbb@tcp:10.0.0.2:1234/cccccccc
-""".format(name=NAME).encode("ascii")
+""".format(
+    name=NAME
+).encode(
+    "ascii"
+)
 
 TWO_SERVERS_YAML = """
 storage:
@@ -592,7 +596,11 @@ storage:
       - name: {name}
         ristretto-issuer-root-url: https://payments.example.com/
         storage-server-FURL: pb://eeeeeeee@tcp:10.0.0.3:1234/ffffffff
-""".format(name=NAME).encode("ascii")
+""".format(
+    name=NAME
+).encode(
+    "ascii"
+)
 
 
 class LeaseMaintenanceServiceTests(TestCase):
diff --git a/src/_zkapauthorizer/tests/test_storage_client.py b/src/_zkapauthorizer/tests/test_storage_client.py
index 947386bb336c0256597937d5150d33278719d325..7b56840cbd5f175ff96debb3836dbe51fa5f1ef1 100644
--- a/src/_zkapauthorizer/tests/test_storage_client.py
+++ b/src/_zkapauthorizer/tests/test_storage_client.py
@@ -123,9 +123,8 @@ shares.total = 10
 [storageclient.plugins.{name}]
 pass-value={pass_value}
 """.format(
-    name=NAME,
-    pass_value=expected
-),
+                name=NAME, pass_value=expected
+            ),
         )
 
         self.assertThat(
@@ -152,9 +151,9 @@ shares.total = 10
 [storageclient.plugins.{name}]
 allowed-public-keys = {allowed_public_keys}
 """.format(
-    name=NAME,
-    allowed_public_keys=",".join(expected),
-),
+                name=NAME,
+                allowed_public_keys=",".join(expected),
+            ),
         )
 
         self.assertThat(