diff --git a/requirements/lint.txt b/requirements/lint.txt
index c4fed54c08..a18ac0b258 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==0.14.14
+ruff==0.15.0
 mypy==1.19.1
 zizmor==1.22.0
 
diff --git a/tests/utils.py b/tests/utils.py
index f4310d0aec..cc35af0447 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -115,7 +115,7 @@ def wait_for_server(
             pass
         except OSError as e:
             # ECONNREFUSED is expected while the server is not started
-            if e.errno not in [errno.ECONNREFUSED]:
+            if e.errno != errno.ECONNREFUSED:
                 logger.warning(
                     "Unexpected error while waiting for server: %s", str(e)
                 )