diff --git a/oidc_provider/lib/utils/token.py b/oidc_provider/lib/utils/token.py
index 9ef7dd2..de93ea2 100644
--- a/oidc_provider/lib/utils/token.py
+++ b/oidc_provider/lib/utils/token.py
@@ -49,7 +49,7 @@ def encode_id_token(id_token_dic, client_secret):
 
     Return a hash.
     """
-    id_token_hash = jwt.encode(id_token_dic, client_secret)
+    id_token_hash = jwt.encode(id_token_dic, client_secret).decode('utf-8')
 
     return id_token_hash
 
diff --git a/oidc_provider/tests/test_authorize_endpoint.py b/oidc_provider/tests/test_authorize_endpoint.py
index b5ba5e4..a1a6310 100644
--- a/oidc_provider/tests/test_authorize_endpoint.py
+++ b/oidc_provider/tests/test_authorize_endpoint.py
@@ -147,7 +147,7 @@ class AuthorizationCodeFlowTestCase(TestCase):
         }
 
         for key, value in iter(to_check.items()):
-            is_input_ok = input_html.format(key, value) in response.content
+            is_input_ok = input_html.format(key, value) in response.content.decode('utf-8')
             self.assertEqual(is_input_ok, True,
                 msg='Hidden input for "'+key+'" fails.')
 
diff --git a/oidc_provider/tests/test_token_endpoint.py b/oidc_provider/tests/test_token_endpoint.py
index 008e6fc..1bd6568 100644
--- a/oidc_provider/tests/test_token_endpoint.py
+++ b/oidc_provider/tests/test_token_endpoint.py
@@ -101,7 +101,7 @@ class TokenTestCase(TestCase):
             'state': self.state,
         }
         response = self._post_request(post_data)
-        response_dic = json.loads(response.content)
+        response_dic = json.loads(response.content.decode('utf-8'))
 
         self.assertEqual('access_token' in response_dic, True,
                 msg='"access_token" key is missing in response.')
@@ -117,7 +117,7 @@ class TokenTestCase(TestCase):
         invalid_data['code'] = code.code
 
         response = self._post_request(invalid_data)
-        response_dic = json.loads(response.content)
+        response_dic = json.loads(response.content.decode('utf-8'))
 
         self.assertEqual('error' in response_dic, True,
                 msg='"error" key should exists in response.')