diff --git a/docs/admin/reset-information.rst b/docs/admin/reset-information.rst
--- a/docs/admin/reset-information.rst
+++ b/docs/admin/reset-information.rst
@@ -30,7 +30,7 @@ account permissions.
     # Use this example to change user permissions
     In [1]: adminuser = User.get_by_username('username')
     In [2]: adminuser.admin = True
-    In [3]: Session.add(adminuser);Session().commit()
+    In [3]: Session().add(adminuser);Session().commit()
     In [4]: exit()
 
 Set to read global ``.hgrc`` file
diff --git a/rhodecode/api/views/pull_request_api.py b/rhodecode/api/views/pull_request_api.py
--- a/rhodecode/api/views/pull_request_api.py
+++ b/rhodecode/api/views/pull_request_api.py
@@ -265,7 +265,7 @@ def merge_pull_request(request, apiuser,
         PullRequestModel().close_pull_request(
             pull_request.pull_request_id, apiuser)
 
-        Session.commit()
+        Session().commit()
     return data
 
 
@@ -319,7 +319,7 @@ def close_pull_request(request, apiuser,
 
     PullRequestModel().close_pull_request(
         pull_request.pull_request_id, apiuser)
-    Session.commit()
+    Session().commit()
     data = {
         'pull_request_id': pull_request.pull_request_id,
         'closed': True,
diff --git a/rhodecode/authentication/views.py b/rhodecode/authentication/views.py
--- a/rhodecode/authentication/views.py
+++ b/rhodecode/authentication/views.py
@@ -96,7 +96,7 @@ class AuthnPluginViewBase(object):
         # Store validated data.
         for name, value in valid_data.items():
             self.plugin.create_or_update_setting(name, value)
-        Session.commit()
+        Session().commit()
 
         # Display success message and redirect.
         self.request.session.flash(
diff --git a/rhodecode/controllers/journal.py b/rhodecode/controllers/journal.py
--- a/rhodecode/controllers/journal.py
+++ b/rhodecode/controllers/journal.py
@@ -244,7 +244,7 @@ class JournalController(BaseController):
             try:
                 self.scm_model.toggle_following_user(
                     user_id, c.rhodecode_user.user_id)
-                Session.commit()
+                Session().commit()
                 return 'ok'
             except Exception:
                 raise HTTPBadRequest()
@@ -254,7 +254,7 @@ class JournalController(BaseController):
             try:
                 self.scm_model.toggle_following_repo(
                     repo_id, c.rhodecode_user.user_id)
-                Session.commit()
+                Session().commit()
                 return 'ok'
             except Exception:
                 raise HTTPBadRequest()
diff --git a/rhodecode/model/settings.py b/rhodecode/model/settings.py
--- a/rhodecode/model/settings.py
+++ b/rhodecode/model/settings.py
@@ -198,7 +198,7 @@ class SettingsModel(BaseModel):
                 # update if set
                 res.app_settings_value = val
 
-        Session.add(res)
+        Session().add(res)
         return res
 
     def invalidate_settings_cache(self):
diff --git a/rhodecode/tests/functional/test_admin_auth_settings.py b/rhodecode/tests/functional/test_admin_auth_settings.py
--- a/rhodecode/tests/functional/test_admin_auth_settings.py
+++ b/rhodecode/tests/functional/test_admin_auth_settings.py
@@ -67,7 +67,7 @@ class TestAuthSettingsController(object)
         for _plugin in _enabled_plugins:
             db_plugin = SettingsModel().get_setting_by_name(_plugin)
             if db_plugin:
-                Session.delete(db_plugin)
+                Session().delete(db_plugin)
         Session().commit()
 
         response = self.app.post(url=test_url, params=params)
diff --git a/rhodecode/tests/plugin.py b/rhodecode/tests/plugin.py
--- a/rhodecode/tests/plugin.py
+++ b/rhodecode/tests/plugin.py
@@ -1189,8 +1189,8 @@ class UserUtility(object):
     def _inherit_default_user_permissions(self, user_name, value):
         user = UserModel().get_by_username(user_name)
         user.inherit_default_permissions = value
-        Session.add(user)
-        Session.commit()
+        Session().add(user)
+        Session().commit()
 
     def cleanup(self):
         self._cleanup_permissions()