diff --git a/tests/test_sso_slo.py b/tests/test_sso_slo.py
index f0db493..b5afb99 100644
--- a/tests/test_sso_slo.py
+++ b/tests/test_sso_slo.py
@@ -107,7 +107,7 @@ def test_sso_slo(db, app, idp, caplog, sp_settings):
     response = app.get(reverse('mellon_login'))
     url, body = idp.process_authn_request_redirect(response['Location'])
     assert url.endswith(reverse('mellon_login'))
-    response = app.post(reverse('mellon_login'), {'SAMLResponse': body})
+    response = app.post(reverse('mellon_login'), params={'SAMLResponse': body})
     assert 'created new user' in caplog.text()
     assert 'logged in using SAML' in caplog.text()
     assert response['Location'].endswith(sp_settings.LOGIN_REDIRECT_URL)
@@ -117,7 +117,7 @@ def test_sso(db, app, idp, caplog, sp_settings):
     response = app.get(reverse('mellon_login'))
     url, body = idp.process_authn_request_redirect(response['Location'])
     assert url.endswith(reverse('mellon_login'))
-    response = app.post(reverse('mellon_login'), {'SAMLResponse': body})
+    response = app.post(reverse('mellon_login'), params={'SAMLResponse': body})
     assert 'created new user' in caplog.text()
     assert 'logged in using SAML' in caplog.text()
     assert response['Location'].endswith(sp_settings.LOGIN_REDIRECT_URL)
@@ -127,7 +127,7 @@ def test_sso_request_denied(db, app, idp, caplog, sp_settings):
     response = app.get(reverse('mellon_login'))
     url, body = idp.process_authn_request_redirect(response['Location'], auth_result=False)
     assert url.endswith(reverse('mellon_login'))
-    response = app.post(reverse('mellon_login'), {'SAMLResponse': body})
+    response = app.post(reverse('mellon_login'), params={'SAMLResponse': body})
     assert "status is not success codes: [u'urn:oasis:names:tc:SAML:2.0:status:Responder',\
  u'urn:oasis:names:tc:SAML:2.0:status:RequestDenied']" in caplog.text()
 
diff --git a/tests/test_views.py b/tests/test_views.py
index ecf2072..7baf7c3 100644
--- a/tests/test_views.py
+++ b/tests/test_views.py
@@ -19,7 +19,7 @@ pytestmark = pytest.mark.django_db
 
 
 def test_null_character_on_samlresponse_post(app):
-    app.post(reverse('mellon_login'), {'SAMLResponse': '\x00'}, status=400)
+    app.post(reverse('mellon_login'), params={'SAMLResponse': '\x00'}, status=400)
 
 
 def test_metadata(private_settings, client):