diff --git a/requirements/lint.txt b/requirements/lint.txt
index 0a5739b457..3264fe4071 100644
--- a/requirements/lint.txt
+++ b/requirements/lint.txt
@@ -6,7 +6,7 @@
 # Lint tools
 # (We are not so interested in the specific versions of the tools: the versions
 # are pinned to prevent unexpected linting failures when tools update)
-ruff==0.8.6
+ruff==0.9.1
 mypy==1.14.1
 
 # Required for type stubs
diff --git a/tuf/api/_payload.py b/tuf/api/_payload.py
index 3149102588..56852082ea 100644
--- a/tuf/api/_payload.py
+++ b/tuf/api/_payload.py
@@ -1222,7 +1222,7 @@ def __init__(
         self.number_of_bins = 2**bit_length
         # suffix_len is calculated based on "number_of_bins - 1" as the name
         # of the last bin contains the number "number_of_bins -1" as a suffix.
-        self.suffix_len = len(f"{self.number_of_bins-1:x}")
+        self.suffix_len = len(f"{self.number_of_bins - 1:x}")
 
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, SuccinctRoles):
diff --git a/tuf/api/serialization/json.py b/tuf/api/serialization/json.py
index b9e964c175..a031ef8255 100644
--- a/tuf/api/serialization/json.py
+++ b/tuf/api/serialization/json.py
@@ -8,6 +8,9 @@
 verification.
 """
 
+# We should not have shadowed stdlib json but that milk spilled already
+# ruff: noqa: A005
+
 import json
 from typing import Optional