diff --git a/bolt-code/bolt/code/ruff_defaults.toml b/bolt-code/bolt/code/ruff_defaults.toml
index 3d2de70d37..c2f521b175 100644
--- a/bolt-code/bolt/code/ruff_defaults.toml
+++ b/bolt-code/bolt/code/ruff_defaults.toml
@@ -17,4 +17,5 @@ extend-select = [
     # # "G",  # flake8-logging-format
     # # "T20",  # print
     "PT",  # pytest
+    "B006",  # mutable-argument-default
 ]
diff --git a/bolt-worker/bolt/worker/scheduling.py b/bolt-worker/bolt/worker/scheduling.py
index 7064f48059..93b1bae399 100644
--- a/bolt-worker/bolt/worker/scheduling.py
+++ b/bolt-worker/bolt/worker/scheduling.py
@@ -44,7 +44,10 @@ def __eq__(self, other):
         return self.values == other.values
 
     @classmethod
-    def parse(cls, value, min_allowed, max_allowed, str_conversions={}):
+    def parse(cls, value, min_allowed, max_allowed, str_conversions=None):
+        if str_conversions is None:
+            str_conversions = {}
+
         if isinstance(value, int):
             if value < min_allowed or value > max_allowed:
                 raise ValueError(
diff --git a/bolt-worker/bolt/worker/workers.py b/bolt-worker/bolt/worker/workers.py
index 109813ae0c..8ddbee35e3 100644
--- a/bolt-worker/bolt/worker/workers.py
+++ b/bolt-worker/bolt/worker/workers.py
@@ -21,12 +21,15 @@ class Worker:
     def __init__(
         self,
         queues,
-        jobs_schedule=[],
+        jobs_schedule=None,
         max_processes=None,
         max_jobs_per_process=None,
         max_pending_per_process=10,
         stats_every=None,
     ):
+        if jobs_schedule is None:
+            jobs_schedule = []
+
         self.executor = ProcessPoolExecutor(
             max_workers=max_processes,
             max_tasks_per_child=max_jobs_per_process,