diff --git a/Dockerfile-debian-bullseye b/Dockerfile-debian-bullseye
new file mode 100644
index 00000000..6651ce7a
--- /dev/null
+++ b/Dockerfile-debian-bullseye
@@ -0,0 +1,12 @@
+# docker build --tag sfconservancy.org-bullseye - < Dockerfile-debian-bullseye
+# docker run --tty --interactive --rm=true --publish=8000:8000 --mount type=bind,source=$(pwd),target=/var/www/website --mount type=bind,source=$(pwd)/conservancy-website.sqlite3,target=/var/lib/www/database/conservancy-website.sqlite3 sfconservancy.org-bullseye:latest
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+FROM debian:bullseye
+RUN apt-get update && apt-get upgrade -y
+RUN apt-get install -y python3 python3-pip python3-wheel sqlite3
+RUN apt-get install -y python3-django python3-bs4 python3-django-countries
+RUN python3 -m pip freeze
+WORKDIR /var/www/website/www
+ENTRYPOINT ["python3", "/var/www/website/www/manage.py", "runserver", "0.0.0.0:8000"]
diff --git a/Dockerfile-debian-stretch b/Dockerfile-debian-stretch
index c9ef5f0d..91ad9120 100644
--- a/Dockerfile-debian-stretch
+++ b/Dockerfile-debian-stretch
@@ -1,5 +1,5 @@
-# docker build --tag sfconservancy.org - < Dockerfile-debian-stretch
-# docker run --tty --interactive --rm=true --publish=8000:8000 --mount type=bind,source=$(pwd),target=/var/www/website --mount type=bind,source=$(pwd)/conservancy-website.sqlite3,target=/var/lib/www/database/conservancy-website.sqlite3 sfconservancy.org:latest
+# docker build --tag sfconservancy.org-stretch - < Dockerfile-debian-stretch
+# docker run --tty --interactive --rm=true --publish=8000:8000 --mount type=bind,source=$(pwd),target=/var/www/website --mount type=bind,source=$(pwd)/conservancy-website.sqlite3,target=/var/lib/www/database/conservancy-website.sqlite3 sfconservancy.org-stretch:latest
 
 ARG DEBIAN_FRONTEND=noninteractive
 
diff --git a/www/conservancy/apps/blog/models.py b/www/conservancy/apps/blog/models.py
index 330f6947..01b3be0c 100644
--- a/www/conservancy/apps/blog/models.py
+++ b/www/conservancy/apps/blog/models.py
@@ -27,7 +27,7 @@ class Entry(models.Model, bsoup.SoupModelMixin):
     summary = models.TextField(help_text="Use raw HTML.  Unlike in the press release model, this summary is not included at the beginning of the body when the entry is displayed.")
     body = models.TextField(help_text="Use raw HTML.  Include the full body of the post.")
     pub_date = models.DateTimeField()
-    author = models.ForeignKey(Person)
+    author = models.ForeignKey(Person, on_delete=models.PROTECT)
     tags = models.ManyToManyField(EntryTag, blank=True)
 
     date_created = models.DateTimeField(auto_now_add=True)
diff --git a/www/conservancy/apps/ccs_upload/urls.py b/www/conservancy/apps/ccs_upload/urls.py
index 66ee72b6..465cf355 100644
--- a/www/conservancy/apps/ccs_upload/urls.py
+++ b/www/conservancy/apps/ccs_upload/urls.py
@@ -2,6 +2,7 @@ from django.conf.urls import url
 
 from . import views
 
+app_name = "ccs_upload"
 urlpatterns = [
     url(r'^$', views.upload, name='form')
 ]
diff --git a/www/conservancy/apps/events/models.py b/www/conservancy/apps/events/models.py
index d34e241c..1b116820 100644
--- a/www/conservancy/apps/events/models.py
+++ b/www/conservancy/apps/events/models.py
@@ -39,8 +39,10 @@ class Event(models.Model):
     description = models.TextField(blank=True)
     people = models.ManyToManyField(Person, blank=True)
     location = models.CharField(max_length=1000)
-    earth_location = models.ForeignKey(EarthLocation, null=True, blank=True,
-                                       help_text="Label will not be displayed")
+    earth_location = models.ForeignKey(
+        EarthLocation, null=True, blank=True, help_text="Label will not be displayed",
+        on_delete=models.CASCADE
+    )
     tags = models.ManyToManyField(EventTag, blank=True)
 
     date_created = models.DateTimeField(auto_now_add=True)
@@ -71,7 +73,7 @@ class EventMedia(models.Model):
     includes transcripts, audio, and video pieces
     """
 
-    event = models.ForeignKey(Event)
+    event = models.ForeignKey(Event, on_delete=models.CASCADE)
     format = models.CharField(max_length=1,
                               choices=(('T', 'Transcript'),
                                        ('A', 'Audio'),
diff --git a/www/conservancy/apps/news/models.py b/www/conservancy/apps/news/models.py
index 64d31d63..f4031b14 100644
--- a/www/conservancy/apps/news/models.py
+++ b/www/conservancy/apps/news/models.py
@@ -97,8 +97,8 @@ class ExternalArticle(models.Model):
 
     tags = models.ManyToManyField(ExternalArticleTag, blank=True)
     people = models.ManyToManyField(Person, blank=True)
-    event = models.ForeignKey(Event, null=True, blank=True)
-    press_release = models.ForeignKey(PressRelease, null=True, blank=True)
+    event = models.ForeignKey(Event, null=True, blank=True, on_delete=models.CASCADE)
+    press_release = models.ForeignKey(PressRelease, null=True, blank=True, on_delete=models.CASCADE)
 
     date_created = models.DateField(auto_now_add=True)
 
diff --git a/www/conservancy/middleware.py b/www/conservancy/middleware.py
index 4aea2acb..17f95283 100644
--- a/www/conservancy/middleware.py
+++ b/www/conservancy/middleware.py
@@ -1,8 +1,11 @@
 from django import http
 from django.conf import settings
 from django.utils.cache import patch_response_headers
+from django.utils.deprecation import MiddlewareMixin
 
-class ForceCanonicalHostnameMiddleware:
+
+class ForceCanonicalHostnameMiddleware(MiddlewareMixin):
+    # MiddlewareMixin provides compatiiblity for Django 1.10 style middleware.
 
     def process_request(self, request):
         """Modified common middleware for Conservancy site