diff --git a/.travis.yml b/.travis.yml
index 1999433..348260b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -38,6 +38,12 @@ env:
 matrix:
   fast_finish: true
   include:
+  - python: '3.4'
+    env: TEST_TYPE=build DJANGO_VERSION=2.0
+  - python: '3.5'
+    env: TEST_TYPE=build DJANGO_VERSION=2.0
+  - python: '3.6'
+    env: TEST_TYPE=build DJANGO_VERSION=2.0
   - python: '2.7'
     env: TEST_TYPE=build DJANGO_VERSION=1.8
   - python: '2.7'
diff --git a/examples/starwars/models.py b/examples/starwars/models.py
index 2f80e27..45741da 100644
--- a/examples/starwars/models.py
+++ b/examples/starwars/models.py
@@ -5,7 +5,7 @@ from django.db import models
 
 class Character(models.Model):
     name = models.CharField(max_length=50)
-    ship = models.ForeignKey('Ship', blank=True, null=True, related_name='characters')
+    ship = models.ForeignKey('Ship', on_delete=models.CASCADE, blank=True, null=True, related_name='characters')
 
     def __str__(self):
         return self.name
@@ -13,7 +13,7 @@ class Character(models.Model):
 
 class Faction(models.Model):
     name = models.CharField(max_length=50)
-    hero = models.ForeignKey(Character)
+    hero = models.ForeignKey(Character, on_delete=models.CASCADE)
 
     def __str__(self):
         return self.name
@@ -21,7 +21,7 @@ class Faction(models.Model):
 
 class Ship(models.Model):
     name = models.CharField(max_length=50)
-    faction = models.ForeignKey(Faction, related_name='ships')
+    faction = models.ForeignKey(Faction, on_delete=models.CASCADE, related_name='ships')
 
     def __str__(self):
         return self.name
diff --git a/graphene_django/filter/filterset.py b/graphene_django/filter/filterset.py
index 3d756d7..0e33fe6 100644
--- a/graphene_django/filter/filterset.py
+++ b/graphene_django/filter/filterset.py
@@ -57,7 +57,11 @@ class GrapheneFilterSetMixin(BaseFilterSet):
         Global IDs (the default implementation expects database
         primary keys)
         """
-        rel = f.field.remote_field if hasattr(f.field, 'remote_field') else f.field.rel
+        try:
+            rel = f.field.remote_field
+        except AttributeError:
+            rel = f.field.rel
+
         default = {
             'name': name,
             'label': capfirst(rel.related_name)
diff --git a/graphene_django/tests/models.py b/graphene_django/tests/models.py
index 029b318..eab70ec 100644
--- a/graphene_django/tests/models.py
+++ b/graphene_django/tests/models.py
@@ -15,7 +15,7 @@ class Pet(models.Model):
 
 class FilmDetails(models.Model):
     location = models.CharField(max_length=30)
-    film = models.OneToOneField('Film', related_name='details')
+    film = models.OneToOneField('Film', on_delete=models.CASCADE, related_name='details')
 
 
 class Film(models.Model):
@@ -74,8 +74,8 @@ class Article(models.Model):
     headline = models.CharField(max_length=100)
     pub_date = models.DateField()
     pub_date_time = models.DateTimeField()
-    reporter = models.ForeignKey(Reporter, related_name='articles')
-    editor = models.ForeignKey(Reporter, related_name='edited_articles_+')
+    reporter = models.ForeignKey(Reporter, on_delete=models.CASCADE, related_name='articles')
+    editor = models.ForeignKey(Reporter, on_delete=models.CASCADE, related_name='edited_articles_+')
     lang = models.CharField(max_length=2, help_text='Language', choices=[
         ('es', 'Spanish'),
         ('en', 'English')
diff --git a/setup.py b/setup.py
index 97d34e1..1e3f5cb 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@ tests_require = [
     'mock',
     'pytz',
     'django-filter',
-    'pytest-django==2.9.1',
+    'pytest-django>=3.2.1',
 ] + rest_framework_require
 
 django_version = 'Django>=1.8.0,<2' if sys.version_info[0] < 3 else 'Django>=1.8.0'