diff --git a/taskflow/conductors/backends/impl_blocking.py b/taskflow/conductors/backends/impl_blocking.py
index 26a75c8a..e3f2f5ab 100644
--- a/taskflow/conductors/backends/impl_blocking.py
+++ b/taskflow/conductors/backends/impl_blocking.py
@@ -83,7 +83,7 @@ class BlockingConductor(base.Conductor):
             raise ValueError("Invalid timeout literal: %s" % (wait_timeout))
         self._dead = threading.Event()
 
-    @removals.removed_kwarg('timeout', version="0.8", removal_version="?")
+    @removals.removed_kwarg('timeout', version="0.8", removal_version="2.0")
     def stop(self, timeout=None):
         """Requests the conductor to stop dispatching.
 
diff --git a/taskflow/conductors/single_threaded.py b/taskflow/conductors/single_threaded.py
index e1fafcce..6f50fe74 100644
--- a/taskflow/conductors/single_threaded.py
+++ b/taskflow/conductors/single_threaded.py
@@ -22,7 +22,7 @@ from taskflow.conductors.backends import impl_blocking
 # TODO(harlowja): remove this module soon...
 removals.removed_module(__name__,
                         replacement="the conductor entrypoints",
-                        version="0.8", removal_version="?",
+                        version="0.8", removal_version="2.0",
                         stacklevel=4)
 
 # TODO(harlowja): remove this proxy/legacy class soon...
diff --git a/taskflow/engines/base.py b/taskflow/engines/base.py
index f41ae583..4b6a648d 100644
--- a/taskflow/engines/base.py
+++ b/taskflow/engines/base.py
@@ -55,7 +55,7 @@ class Engine(object):
 
     @property
     @moves.moved_property('atom_notifier', version="0.6",
-                          removal_version="?")
+                          removal_version="2.0")
     def task_notifier(self):
         """The task notifier.
 
@@ -128,4 +128,4 @@ class Engine(object):
 
 # TODO(harlowja): remove in 0.7 or later...
 EngineBase = moves.moved_class(Engine, 'EngineBase', __name__,
-                               version="0.6", removal_version="?")
+                               version="0.6", removal_version="2.0")
diff --git a/taskflow/engines/helpers.py b/taskflow/engines/helpers.py
index a9171e46..679b65ea 100644
--- a/taskflow/engines/helpers.py
+++ b/taskflow/engines/helpers.py
@@ -92,7 +92,7 @@ def _extract_engine(**kwargs):
         stacklevel = sum(1 for _frame in finder)
         decorator = renames.renamed_kwarg('engine_conf', 'engine',
                                           version="0.6",
-                                          removal_version="?",
+                                          removal_version="2.0",
                                           # Three is added on since the
                                           # decorator adds three of its own
                                           # stack levels that we need to
diff --git a/taskflow/listeners/base.py b/taskflow/listeners/base.py
index a83cd79b..8a0badb0 100644
--- a/taskflow/listeners/base.py
+++ b/taskflow/listeners/base.py
@@ -166,7 +166,7 @@ class Listener(object):
 
 # TODO(harlowja): remove in 0.7 or later...
 ListenerBase = moves.moved_class(Listener, 'ListenerBase', __name__,
-                                 version="0.6", removal_version="?")
+                                 version="0.6", removal_version="2.0")
 
 
 @six.add_metaclass(abc.ABCMeta)
@@ -213,7 +213,7 @@ class DumpingListener(Listener):
 # TODO(harlowja): remove in 0.7 or later...
 class LoggingBase(moves.moved_class(DumpingListener,
                                     'LoggingBase', __name__,
-                                    version="0.6", removal_version="?")):
+                                    version="0.6", removal_version="2.0")):
 
     """Legacy logging base.
 
diff --git a/taskflow/listeners/timing.py b/taskflow/listeners/timing.py
index d91ff007..351b2bda 100644
--- a/taskflow/listeners/timing.py
+++ b/taskflow/listeners/timing.py
@@ -91,7 +91,7 @@ class DurationListener(base.Listener):
 
 TimingListener = moves.moved_class(DurationListener,
                                    'TimingListener', __name__,
-                                   version="0.8", removal_version="?")
+                                   version="0.8", removal_version="2.0")
 
 
 class PrintingDurationListener(DurationListener):
@@ -117,7 +117,7 @@ class PrintingDurationListener(DurationListener):
 
 PrintingTimingListener = moves.moved_class(
     PrintingDurationListener, 'PrintingTimingListener', __name__,
-    version="0.8", removal_version="?")
+    version="0.8", removal_version="2.0")
 
 
 class EventTimeListener(base.Listener):
diff --git a/taskflow/persistence/backends/impl_memory.py b/taskflow/persistence/backends/impl_memory.py
index 37a67d06..a056856d 100644
--- a/taskflow/persistence/backends/impl_memory.py
+++ b/taskflow/persistence/backends/impl_memory.py
@@ -193,7 +193,7 @@ class FakeFilesystem(object):
         return [selector_func(node, child_node)
                 for child_node in node.bfs_iter()]
 
-    @removals.removed_kwarg('recursive', version="0.11", removal_version="?")
+    @removals.removed_kwarg('recursive', version="0.11", removal_version="2.0")
     def ls(self, path, recursive=False):
         """Return list of all children of the given path.
 
diff --git a/taskflow/utils/misc.py b/taskflow/utils/misc.py
index 87f68355..bd2e6e38 100644
--- a/taskflow/utils/misc.py
+++ b/taskflow/utils/misc.py
@@ -505,12 +505,12 @@ def ensure_tree(path):
 
 Failure = deprecation.moved_proxy_class(failure.Failure,
                                         'Failure', __name__,
-                                        version="0.6", removal_version="?")
+                                        version="0.6", removal_version="2.0")
 
 
 Notifier = deprecation.moved_proxy_class(notifier.Notifier,
                                          'Notifier', __name__,
-                                         version="0.6", removal_version="?")
+                                         version="0.6", removal_version="2.0")
 
 
 @contextlib.contextmanager