diff --git a/CHANGELOG b/CHANGELOG
index 5cb7cbc..5338efd 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+- 0.2.3
+	* Add memstore
 - 0.2.2
 	* Fix composite state factory load regex
 - 0.2.1
diff --git a/shep/store/base.py b/shep/store/base.py
index 8da1429..e428a7a 100644
--- a/shep/store/base.py
+++ b/shep/store/base.py
@@ -13,3 +13,7 @@ class StoreFactory:
 
     def close(self):
         pass
+
+
+    def ls(self):
+        raise NotImplementedError()
diff --git a/shep/store/noop.py b/shep/store/noop.py
new file mode 100644
index 0000000..955ef4c
--- /dev/null
+++ b/shep/store/noop.py
@@ -0,0 +1,44 @@
+# local imports
+from .base import StoreFactory
+
+
+class NoopStore:
+
+    def put(self, k, contents=None):
+        pass
+
+
+    def remove(self, k):
+        pass
+
+    def get(self, k):
+        pass
+
+
+    def list(self):
+        return []
+
+
+    def path(self):
+        return None
+
+
+    def replace(self, k, contents):
+        pass
+
+    def modified(self, k):
+        pass
+
+
+    def register_modify(self, k):
+        pass
+
+
+class NoopStoreFactory(StoreFactory):
+
+    def add(self, k):
+        return NoopStore()
+
+
+    def ls(self):
+        return []
diff --git a/tests/test_noop.py b/tests/test_noop.py
new file mode 100644
index 0000000..fe87b3b
--- /dev/null
+++ b/tests/test_noop.py
@@ -0,0 +1,78 @@
+# standard imports
+import unittest
+import os
+import logging
+import sys
+import importlib
+import tempfile
+
+# local imports
+from shep.persist import PersistedState
+from shep.store.noop import NoopStoreFactory
+from shep.error import (
+        StateExists,
+        StateInvalid,
+        StateItemExists,
+        StateItemNotFound,
+        )
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+
+class TestNoopStore(unittest.TestCase):
+        
+    def setUp(self):
+        self.factory = NoopStoreFactory()
+        self.states = PersistedState(self.factory.add, 3)
+        self.states.add('foo') 
+        self.states.add('bar') 
+        self.states.add('baz') 
+
+
+    def test_add(self):
+        self.states.put('abcd', state=self.states.FOO, contents='baz')
+        v = self.states.get('abcd')
+        self.assertEqual(v, 'baz')
+        v = self.states.state('abcd')
+        self.assertEqual(v, self.states.FOO)
+
+
+    def test_next(self):
+        self.states.put('abcd')
+
+        self.states.next('abcd')
+        self.assertEqual(self.states.state('abcd'), self.states.FOO)
+        
+        self.states.next('abcd')
+        self.assertEqual(self.states.state('abcd'), self.states.BAR)
+
+        self.states.next('abcd')
+        self.assertEqual(self.states.state('abcd'), self.states.BAZ)
+
+        with self.assertRaises(StateInvalid):
+            self.states.next('abcd')
+
+        v = self.states.state('abcd')
+        self.assertEqual(v, self.states.BAZ)
+
+
+    def test_replace(self):
+        with self.assertRaises(StateItemNotFound):
+            self.states.replace('abcd', contents='foo')
+
+        self.states.put('abcd', state=self.states.FOO, contents='baz')
+        self.states.replace('abcd', contents='bar')
+        v = self.states.get('abcd')
+        self.assertEqual(v, 'bar')
+
+
+    def test_factory_ls(self):
+        self.states.put('abcd')
+        self.states.put('xxxx', state=self.states.BAZ)
+        r = self.factory.ls()
+        self.assertEqual(len(r), 0)
+
+
+if __name__ == '__main__':
+    unittest.main()