diff --git a/lark/__init__.py b/lark/__init__.py
index f3339d9..7573415 100644
--- a/lark/__init__.py
+++ b/lark/__init__.py
@@ -3,4 +3,4 @@ from .common import ParseError, GrammarError
 from .lark import Lark
 from .utils import inline_args
 
-__version__ = "0.3.5"
+__version__ = "0.3.6"
diff --git a/lark/parsers/earley.py b/lark/parsers/earley.py
index 4225b4d..4cc9b0d 100644
--- a/lark/parsers/earley.py
+++ b/lark/parsers/earley.py
@@ -69,6 +69,7 @@ class Item(object):
 
 class Item_JoinDerivations(Item):
     __eq__ = Item.similar
+    __hash__ = Item.__hash__
 
 
 class NewsList(list):