diff --git a/README.md b/README.md
index da9d2020..094ce6f7 100644
--- a/README.md
+++ b/README.md
@@ -9,11 +9,9 @@ Code Yellow backend framework for SPA webapps with REST-like API.
 
 ## Running the tests
 
-There are two ways to run the tests:
-- Run directly `./setup.py test` (requires you to have python3 and postgres installed)
-- Run with docker `docker-compose run binder ./setup.py test`
-  - Access the test database directly by with `docker-compose run db psql -h db -U postgres`.
-  - It may be possible to recreate the test database (for example when you added/changed models). One way of achieving this is to just remove all the docker images that were build `docker-compose rm`. The database will be created during the setup in `tests/__init__.py`.
+Run with docker `docker compose run binder ./setup.py test` (but you may need to run `docker compose build db binder` first)
+- Access the test database directly by with `docker compose run db psql -h db -U postgres`.
+- It may be possible to recreate the test database (for example when you added/changed models). One way of achieving this is to just remove all the docker images that were build `docker compose rm`. The database will be created during the setup in `tests/__init__.py`.
 
 The tests are set up in such a way that there is no need to keep migration files. The setup procedure in `tests/__init__.py` handles the preparation of the database by directly calling some build-in Django commands.
 
@@ -21,19 +19,4 @@ To only run a selection of the tests, use the `-s` flag like `./setup.py test -s
 
 ## MySQL support
 
-MySQL is supported, but only with the goal to replace it with
-PostgreSQL.  This means it has a few limitations:
-
-- `where` filtering on `with` relations is not supported.
-- Only integer primary keys are supported.
-- When fetching large number of records using `with` or the ids are big, be sure to increase `GROUP_CONCAT` max string length by:
-
-```
-DATABASES = {
-	'default': {
-		'OPTIONS': {
-            'init_command': 'SET SESSION group_concat_max_len = 1000000',
-        },
-	},
-}
-```
+MySQL was supported at some point, but not anymore I guess.
diff --git a/binder/views.py b/binder/views.py
index 21c3d076..0aa2e3a5 100644
--- a/binder/views.py
+++ b/binder/views.py
@@ -1289,18 +1289,13 @@ def _filter_field(self, field_name, qualifier, value, invert, request, include_a
 				raise FieldDoesNotExist()
 			field = self.model._meta.get_field(field_name)
 		except FieldDoesNotExist:
-			rel = partial and '.'.join(partial[:-2].split('__'))
-			annotations = self.annotations(request, {'': include_annotations.get(rel)})
+			annotations = self.annotations(request, {'': include_annotations.get('')})
 			if field_name not in annotations:
 				raise BinderRequestError('Unknown field in filter: {{{}}}.{{{}}}.'.format(self.model.__name__, field_name))
 			if partial:
 				# NOTE: This creates a subquery; try to avoid this!
 				qs = annotate(self.model.objects.all(), request, annotations)
-				qs = qs.filter(self._filter_field(field_name, qualifier, value, invert, request, {
-					rel_[len(rel) + 1:]: annotations
-					for rel_, annotations in include_annotations.items()
-					if rel_ == rel or rel_.startswith(rel + '.')
-				}))
+				qs = qs.filter(self._filter_field(field_name, qualifier, value, invert, request, include_annotations))
 				return Q(**{partial + 'in': qs})
 			field = annotations[field_name]['field']
 
diff --git a/docker-compose.yml b/docker-compose.yml
index b0aeb0c7..efbdbbe6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,6 +1,8 @@
 services:
   db:
-    image: postgres:11.5
+    image: postgres:13.21
+    environment:
+      - POSTGRES_HOST_AUTH_METHOD=trust # Insecure, but fine for just for running tests.
   binder:
     build: .
     command: tail -f /dev/null
diff --git a/tests/plugins/test_csvexport.py b/tests/plugins/test_csvexport.py
index 3f04b693..ed1fd37b 100644
--- a/tests/plugins/test_csvexport.py
+++ b/tests/plugins/test_csvexport.py
@@ -121,9 +121,9 @@ def test_download_extra_params(self):
 		self.assertEqual(data[0], ['ID', 'Name', 'Scary'])
 
 		# All other data needs to be ordered using the default ordering (by id, asc)
-		self.assertEqual(data[1], [str(caretaker_1.id), 'Foo', 'boo!'])
-		self.assertEqual(data[2], [str(caretaker_2.id), 'Bar', 'boo!'])
-		self.assertEqual(data[3], [str(caretaker_3.id), 'Baz', 'boo!'])
+		self.assertEqual(data[1], [str(caretaker_1.id), 'Foo', 'boo! Foo'])
+		self.assertEqual(data[2], [str(caretaker_2.id), 'Bar', 'boo! Bar'])
+		self.assertEqual(data[3], [str(caretaker_3.id), 'Baz', 'boo! Baz'])
 
 	def test_context_aware_download_xlsx(self):
 		response = self.client.get('/picture/download/?response_type=xlsx')
diff --git a/tests/test_filterable_relations.py b/tests/test_filterable_relations.py
index 1e17fec5..6df464ff 100644
--- a/tests/test_filterable_relations.py
+++ b/tests/test_filterable_relations.py
@@ -456,3 +456,28 @@ def test_where_ignores_commas_in_parens(self):
 			},
 			EXTRA(): None,
 		})
+
+	def test_filter_on_relation_with_include_annotations_using_where(self):
+		zoo = Zoo.objects.create(name='Apenheul')
+
+		carl = Caretaker.objects.create(name="carl")
+		tim = Caretaker.objects.create(name="tim")
+
+		Animal.objects.create(name='Harambe', zoo=zoo, caretaker=carl)
+		Animal.objects.create(name='Bokito', zoo=zoo, caretaker=tim)
+		Animal.objects.create(name='Rafiki', zoo=zoo)
+
+		res = self.client.get('/animal/', data={
+			'with': 'caretaker',
+			'include_annotations': 'caretaker.scary',
+			'where': 'caretaker(scary=boo! tim)',
+		})
+		self.assertEqual(res.status_code, 200)
+		data = jsonloads(res.content)
+		print(data)
+
+		self.assertEqual(1, len(data['with']))
+		self.assertEqual(1, len(data['with']['caretaker']))
+		with_tim = data['with']['caretaker'][0]
+		self.assertEqual('tim', with_tim['name'])
+		self.assertEqual('boo! tim', with_tim['scary'])
diff --git a/tests/testapp/models/caretaker.py b/tests/testapp/models/caretaker.py
index 9e28a1e1..ab63a454 100644
--- a/tests/testapp/models/caretaker.py
+++ b/tests/testapp/models/caretaker.py
@@ -25,5 +25,5 @@ class Annotations:
 		bsn = F('ssn')  # simple alias
 		last_present = F('last_seen')
 		scary = OptionalAnnotation(
-			Value('boo!', output_field=models.TextField())
+			models.functions.Concat(Value('boo! '), 'name', output_field=models.TextField())
 		)