diff --git a/src/jobflow/core/flow.py b/src/jobflow/core/flow.py
index 168ca8fb..7d3c1899 100644
--- a/src/jobflow/core/flow.py
+++ b/src/jobflow/core/flow.py
@@ -617,7 +617,7 @@ def update_metadata(
         function_filter: Callable = None,
         dict_mod: bool = False,
         dynamic: bool = True,
-        callback_filter: Callable[[Flow | Job], bool] = lambda _: True,
+        callback_filter: Callable[[Flow | Job], bool] | None = None,
     ):
         """
         Update the metadata of the Flow and/or its Jobs.
@@ -681,7 +681,7 @@ def update_metadata(
                 callback_filter=callback_filter,
             )
 
-        if callback_filter(self) is False:
+        if callback_filter is not None and callback_filter(self) is False:
             return
 
         if dict_mod:
diff --git a/src/jobflow/core/job.py b/src/jobflow/core/job.py
index f18eea63..be630627 100644
--- a/src/jobflow/core/job.py
+++ b/src/jobflow/core/job.py
@@ -926,7 +926,7 @@ def update_metadata(
         function_filter: Callable = None,
         dict_mod: bool = False,
         dynamic: bool = True,
-        callback_filter: Callable[[jobflow.Flow | Job], bool] = lambda _: True,
+        callback_filter: Callable[[jobflow.Flow | Job], bool] | None = None,
     ):
         """
         Update the metadata of the job.
@@ -1006,7 +1006,7 @@ def update_metadata(
         ):
             return
 
-        if callback_filter(self) is False:
+        if callback_filter is not None and callback_filter(self) is False:
             return
 
         # if we get to here then we pass all the filters
diff --git a/src/jobflow/utils/uuid.py b/src/jobflow/utils/uuid.py
index f822d932..93c5ecf3 100644
--- a/src/jobflow/utils/uuid.py
+++ b/src/jobflow/utils/uuid.py
@@ -4,7 +4,10 @@
 
 
 @deprecated(
-    message="The UUID system will be replace with UID that contains both UUID and ULID."
+    message=(
+        "The UUID system will be replaced with a UID that "
+        "contains both the UUID and ULID."
+    )
 )
 def suuid() -> str:
     """