diff --git a/apptools/logger/plugin/view/logger_view.py b/apptools/logger/plugin/view/logger_view.py
index 18dca391..b3e1e324 100644
--- a/apptools/logger/plugin/view/logger_view.py
+++ b/apptools/logger/plugin/view/logger_view.py
@@ -95,10 +95,10 @@ class LoggerView(TraitsUIView):
     service = Instance(LoggerService)
 
     log_records = List(Instance(logging.LogRecord))
-    formatted_records = Property(Str, depends_on="log_records")
+    formatted_records = Property(Str, observe="log_records")
 
     activated = Instance(logging.LogRecord)
-    activated_text = Property(Str, depends_on="activated")
+    activated_text = Property(Str, observe="activated")
     reset_button = Button("Reset Logs")
     show_button = Button("Complete Text Log")
     copy_button = Button("Copy Log to Clipboard")
diff --git a/apptools/naming/tests/test_object_serializer.py b/apptools/naming/tests/test_object_serializer.py
index 623d9cfe..5b315481 100644
--- a/apptools/naming/tests/test_object_serializer.py
+++ b/apptools/naming/tests/test_object_serializer.py
@@ -22,7 +22,7 @@ class FooWithTraits(HasTraits):
 
     full_name = Str()
 
-    last_name = Property(depends_on="full_name")
+    last_name = Property(observe="full_name")
 
     event = Event()
 
diff --git a/setup.py b/setup.py
index 8cd0b9e5..69884f33 100644
--- a/setup.py
+++ b/setup.py
@@ -304,6 +304,7 @@ def get_long_description():
         },
         install_requires=[
             'configobj',
+            'traits>=6.2.0',
             'traitsui',
         ],
         extras_require={