diff --git a/.gitignore b/.gitignore
index 654f3e7..bf2f15f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,6 @@ dist/
 
 # Ignore PyCharm
 .idea/
+
+# Ignore tox environments
+.tox/
diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index bb1d0ff..9b56ffa 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -28,7 +28,7 @@ build:
             -
                 command: flake8 ./localized_fields/
             -
-                command: coverage run manage.py test
+                command: tox
                 coverage:
                     file: '.coverage'
                     format: 'py-cc'
diff --git a/requirements/test.txt b/requirements/test.txt
index 60c0ffa..d3b114c 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -1,6 +1,5 @@
 -r base.txt
 
-Django==1.11.9
 django-autoslug==1.9.3
 django-bleach==0.3.0
 django-coverage-plugin==1.3.1
@@ -14,3 +13,4 @@ django-coverage-plugin==1.3.1
 flake8==3.5.0
 pep8==1.7.1
 dj-database-url==0.4.2
+tox==2.9.1
diff --git a/tests/test_expressions.py b/tests/test_expressions.py
index 8abc57a..79ce45f 100644
--- a/tests/test_expressions.py
+++ b/tests/test_expressions.py
@@ -32,7 +32,7 @@ class LocalizedExpressionsTestCase(TestCase):
         cls.TestModel2 = get_fake_model(
             {
                 'text': LocalizedField(),
-                'other': models.ForeignKey(cls.TestModel1, related_name='features')
+                'other': models.ForeignKey(cls.TestModel1, related_name='features', on_delete=models.CASCADE)
             }
         )
 
diff --git a/tests/test_slug_fields.py b/tests/test_slug_fields.py
index 4d2d172..96b0772 100644
--- a/tests/test_slug_fields.py
+++ b/tests/test_slug_fields.py
@@ -175,7 +175,7 @@ class LocalizedSlugFieldTestCase(TestCase):
         model = get_fake_model(
             {
                 'title': LocalizedField(),
-                'other': models.ForeignKey(model_fk),
+                'other': models.ForeignKey(model_fk, on_delete=models.CASCADE),
                 'slug': LocalizedUniqueSlugField(populate_from=('title', 'other.name'))
             }
         )
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..a7f9784
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,12 @@
+[tox]
+envlist = py35-dj{111,20}
+
+[testenv]
+deps =
+    dj111: Django>=1.11,<1.12
+    dj20: Django>=2.0,<2.1
+    -rrequirements/test.txt
+setenv =
+    DJANGO_SETTINGS_MODULE=settings
+passenv = DATABASE_URL
+commands = coverage run manage.py test