diff --git a/pyiron_contrib/workflow/channels.py b/pyiron_contrib/workflow/channels.py
index 64d760567..8bf6be53b 100644
--- a/pyiron_contrib/workflow/channels.py
+++ b/pyiron_contrib/workflow/channels.py
@@ -387,6 +387,7 @@ class OutputData(DataChannel):
     On `update`, Output channels propagate their value to all the input channels to
     which they are connected by invoking their `update` method.
     """
+
     def _after_update(self) -> None:
         for inp in self.connections:
             inp.update(self.value)
@@ -446,6 +447,7 @@ class InputSignal(SignalChannel):
     """
     Invokes a callback when called.
     """
+
     def __init__(
         self,
         label: str,
@@ -481,6 +483,7 @@ class OutputSignal(SignalChannel):
     """
     Calls all the input signal objects in its connections list when called.
     """
+
     def __call__(self) -> None:
         for c in self.connections:
             c()
diff --git a/pyiron_contrib/workflow/io.py b/pyiron_contrib/workflow/io.py
index 8c6e21e02..c5bc278c0 100644
--- a/pyiron_contrib/workflow/io.py
+++ b/pyiron_contrib/workflow/io.py
@@ -206,6 +206,7 @@ class Signals:
         input (InputSignals): An empty input signals IO container.
         output (OutputSignals): An empty input signals IO container.
     """
+
     def __init__(self):
         self.input = InputSignals()
         self.output = OutputSignals()