diff --git a/aiohttp_session/__init__.py b/aiohttp_session/__init__.py
index 76a0b7ca..290f72bf 100644
--- a/aiohttp_session/__init__.py
+++ b/aiohttp_session/__init__.py
@@ -16,7 +16,7 @@ class Session(MutableMapping):
 
     """Session dict-like object."""
 
-    def __init__(self, identity, *, data=None, new=False, max_age):
+    def __init__(self, identity, *, data=None, new=False):
         self._changed = False
         self._mapping = {}
         self._identity = identity
@@ -29,10 +29,6 @@ def __init__(self, identity, *, data=None, new=False, max_age):
         else:
             self._created = created
 
-        self._expire_at = data.get('expire_at')
-        if self._expire_at is None:
-            self._expire_at = time.time() + max_age
-
         if session_data is not None:
             self._mapping.update(session_data)
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index d9c52826..441a980c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,4 +5,5 @@ sphinx
 alabaster>=0.6.2
 pep257
 -e .
-
+aioredis
+cryptography
diff --git a/tests/test_session_dict.py b/tests/test_session_dict.py
index 56f1a1c7..ef38b730 100644
--- a/tests/test_session_dict.py
+++ b/tests/test_session_dict.py
@@ -7,7 +7,7 @@
 class SessionTests(unittest.TestCase):
 
     def test_create(self):
-        s = Session('test_identity', new=True, default_age=123)
+        s = Session('test_identity', new=True)
         self.assertEqual(s, {})
         self.assertTrue(s.new)
         self.assertEqual('test_identity', s.identity)