diff --git a/mapit/models.py b/mapit/models.py
index d51d9164..08de91bb 100644
--- a/mapit/models.py
+++ b/mapit/models.py
@@ -18,9 +18,8 @@
 
 
 def materialized():
-    version = connection.cursor().connection.server_version
     materialized = ''
-    if version >= 120000:
+    if connection.pg_version >= 120000:
         materialized = 'MATERIALIZED'
     return materialized
 
@@ -191,8 +190,8 @@ def intersect(self, query_type, area, types, generation):
         params = [area.id, area.id, generation.id, generation.id]
 
         if types:
-            params.append(tuple(types))
-            query_area_type = ' AND mapit_area.type_id IN (SELECT id FROM mapit_type WHERE code IN %s) '
+            params.append(list(types))
+            query_area_type = ' AND mapit_area.type_id IN (SELECT id FROM mapit_type WHERE code = ANY(%s)) '
         else:
             query_area_type = ''
 
@@ -452,7 +451,7 @@ def filter_by_area(self, area, limit=''):
             WHERE area_id = %s'''
         query = '''
 WITH target AS %s ( %s )
-SELECT "mapit_postcode"."id", "mapit_postcode"."postcode", "mapit_postcode"."location"::bytea
+SELECT "mapit_postcode"."id", "mapit_postcode"."postcode", "mapit_postcode"."location"
   FROM mapit_postcode, target
  WHERE ST_CoveredBy(location, target.division)
  %s
diff --git a/mapit/views/areas.py b/mapit/views/areas.py
index 1791f41e..2cc6073a 100644
--- a/mapit/views/areas.py
+++ b/mapit/views/areas.py
@@ -1,5 +1,5 @@
 import re
-from psycopg2 import InternalError
+from django.db import InternalError
 from django.db.utils import DatabaseError
 
 from django.utils.translation import gettext as _
diff --git a/mapit_gb/management/commands/mapit_UK_add_ons_to_gss.py b/mapit_gb/management/commands/mapit_UK_add_ons_to_gss.py
index cee7ccb1..1d781d53 100644
--- a/mapit_gb/management/commands/mapit_UK_add_ons_to_gss.py
+++ b/mapit_gb/management/commands/mapit_UK_add_ons_to_gss.py
@@ -7,7 +7,7 @@
 import sys
 from django.core.management.base import BaseCommand
 from mapit.models import Area, CodeType
-from psycopg2 import IntegrityError
+from django.db import IntegrityError
 
 python_version = sys.version_info[0]
 
diff --git a/mapit_gb/management/commands/mapit_UK_update_ons_ids.py b/mapit_gb/management/commands/mapit_UK_update_ons_ids.py
index cb2e420b..e758db9e 100644
--- a/mapit_gb/management/commands/mapit_UK_update_ons_ids.py
+++ b/mapit_gb/management/commands/mapit_UK_update_ons_ids.py
@@ -3,7 +3,7 @@
 import csv
 from django.core.management.base import BaseCommand
 from mapit.models import Area, Generation, CodeType
-from psycopg2 import IntegrityError
+from django.db import IntegrityError
 
 
 class Command(BaseCommand):
diff --git a/mapit_gb/management/commands/mapit_UK_update_ons_ids2.py b/mapit_gb/management/commands/mapit_UK_update_ons_ids2.py
index afba95e2..81e69b47 100644
--- a/mapit_gb/management/commands/mapit_UK_update_ons_ids2.py
+++ b/mapit_gb/management/commands/mapit_UK_update_ons_ids2.py
@@ -4,7 +4,7 @@
 import csv
 from django.core.management.base import BaseCommand
 from mapit.models import Area, Generation, CodeType
-from psycopg2 import IntegrityError
+from django.db import IntegrityError
 
 
 class Command(BaseCommand):
diff --git a/setup.py b/setup.py
index a31ad4e2..f99bdc11 100644
--- a/setup.py
+++ b/setup.py
@@ -53,11 +53,13 @@ def read_file(filename):
     install_requires=[
         'Django >= 4.2, <6.0',
         'libsass >= 0.13.3',
-        'psycopg2',
         'PyYAML',
         'Shapely',
         'uk-postcode-utils',
     ],
+    extras_require={
+        'psycopg': ['psycopg'],
+    },
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Web Environment',
diff --git a/tox.ini b/tox.ini
index 52cf6e5d..5fe660d6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,8 @@ envlist = flake8, py310-{4.2,5.2}
 commands =
     flake8: flake8 mapit mapit_gb mapit_it mapit_no mapit_se mapit_za project
     py310: python -W all -W ignore::PendingDeprecationWarning -m coverage run --source mapit manage.py test mapit mapit_gb
+extras =
+    py310: psycopg
 deps =
     py310: coverage
     flake8: flake8