diff --git a/gaphor/services/undomanager.py b/gaphor/services/undomanager.py
index b718ee395..4131d90c2 100644
--- a/gaphor/services/undomanager.py
+++ b/gaphor/services/undomanager.py
@@ -153,9 +153,6 @@ class UndoManager(object):
 
     @component.adapter(IModelFactoryEvent)
     def reset(self, event=None):
-        
-        self.logger.debug('Handling IModelFactoryEvent')
-        
         self.clear_redo_stack()
         self.clear_undo_stack()
         self._action_executed()
@@ -166,10 +163,6 @@ class UndoManager(object):
         """
         Add an action to the current transaction
         """
-        
-        self.logger.debug('Handling TransactionBegin event')
-        self.logger.debug('Current transaction is %s' % self._current_transaction)
-        
         assert not self._current_transaction
         self._current_transaction = ActionStack()
 
@@ -187,10 +180,6 @@ class UndoManager(object):
 
     @component.adapter(TransactionCommit)
     def commit_transaction(self, event=None):
-        
-        self.logger.debug('Handling TransactionCommit event')
-        self.logger.debug('Current transaction is %s' % self._current_transaction)
-        
         assert self._current_transaction
 
         if self._current_transaction.can_execute():
@@ -211,10 +200,6 @@ class UndoManager(object):
         """
         Roll back the transaction we're in.
         """
-        
-        self.logger.debug('Handling TransactionRollback event')
-        self.logger.debug('Current transaction is %s' % self._current_transaction)
-        
         assert self._current_transaction
 
         # Store stacks
@@ -309,9 +294,6 @@ class UndoManager(object):
 
     @component.adapter(ActionExecuted)
     def _action_executed(self, event=None):
-        
-        self.logger.debug('Handling ActionExecuted event')
-        
         self.action_group.get_action('edit-undo').set_sensitive(self.can_undo())
         self.action_group.get_action('edit-redo').set_sensitive(self.can_redo())
 
@@ -359,11 +341,6 @@ class UndoManager(object):
 
     @component.adapter(ElementCreateEvent)
     def undo_create_event(self, event):
-        
-        self.logger.debug('Handling ElementCreateEvent event')
-        self.logger.debug('Element is %s' % event.element)
-        self.logger.debug('Service is %s' % event.service)
-        
         factory = event.service
         # A factory is not always present, e.g. for DiagramItems
         if not factory:
@@ -380,11 +357,6 @@ class UndoManager(object):
 
     @component.adapter(IElementDeleteEvent)
     def undo_delete_event(self, event):
-        
-        self.logger.debug('Handling IElementDeleteEvent event')
-        self.logger.debug('Element is %s' % event.element)
-        self.logger.debug('Service is %s' % event.service)
-        
         factory = event.service
         # A factory is not always present, e.g. for DiagramItems
         if not factory:
@@ -399,12 +371,6 @@ class UndoManager(object):
 
     @component.adapter(IAttributeChangeEvent)
     def undo_attribute_change_event(self, event):
-        
-        self.logger.debug('Handling IAttributeChangeEvent event')
-        self.logger.debug('Element is %s' % event.element)
-        self.logger.debug('Property is %s' % event.property)
-        self.logger.debug('Old value is %s' % event.old_value)
-        
         attribute = event.property
         element = event.element
         value = event.old_value
@@ -417,12 +383,6 @@ class UndoManager(object):
 
     @component.adapter(AssociationSetEvent)
     def undo_association_set_event(self, event):
-        
-        self.logger.debug('Handling AssociationSetEvent event')
-        self.logger.debug('Element is %s' % event.element)
-        self.logger.debug('Property is %s' % event.property)
-        self.logger.debug('Old value is %s' % event.old_value)
-        
         association = event.property
         element = event.element
         value = event.old_value
@@ -437,12 +397,6 @@ class UndoManager(object):
 
     @component.adapter(AssociationAddEvent)
     def undo_association_add_event(self, event):
-        
-        self.logger.debug('Handling AssociationAddEvent event')
-        self.logger.debug('Element is %s' % event.element)
-        self.logger.debug('Property is %s' % event.property)
-        self.logger.debug('New value is %s' % event.new_value)
-        
         association = event.property
         element = event.element
         value = event.new_value
@@ -456,12 +410,6 @@ class UndoManager(object):
 
     @component.adapter(AssociationDeleteEvent)
     def undo_association_delete_event(self, event):
-        
-        self.logger.debug('Handling AssociationDeleteEvent event')
-        self.logger.debug('Element is %s' % event.element)
-        self.logger.debug('Property is %s' % event.property)
-        self.logger.debug('Old value is %s' % event.old_value)
-        
         association = event.property
         element = event.element
         value = event.old_value