diff --git a/CHANGES.rst b/CHANGES.rst
index a50d32e..3f853af 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,13 @@ CHANGES
 4.2.0 (Unreleased)
 ------------------
 
+General:
+
+* #149 django-redshift-backend depends directly on psycopg2.
+  If you want to use psycopg2 pre-built packages, please refer to
+  the following site for more information: 
+  https://www.psycopg.org/docs/install.html
+
 Features:
 
 * #143 Add Django-5.0 support.
diff --git a/django_redshift_backend/base.py b/django_redshift_backend/base.py
index ab158a0..b5e68dc 100644
--- a/django_redshift_backend/base.py
+++ b/django_redshift_backend/base.py
@@ -15,7 +15,7 @@
 import django
 from django.utils import timezone
 from django.conf import settings
-from django.core.exceptions import FieldDoesNotExist
+from django.core.exceptions import FieldDoesNotExist, ImproperlyConfigured
 from django.db.models import Index
 from django.db.models.expressions import Col
 from django.db.utils import NotSupportedError, ProgrammingError
@@ -37,9 +37,13 @@
     DatabaseIntrospection as BasePGDatabaseIntrospection,
 )
 from .meta import DistKey, SortKey
-from psycopg2.extensions import Binary
 
-from .psycopg2adapter import RedshiftBinary
+try:
+    from psycopg2.extensions import Binary
+    from .psycopg2adapter import RedshiftBinary
+except ImportError as e:
+    raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
+
 
 logger = logging.getLogger("django.db.backends")
 
diff --git a/pyproject.toml b/pyproject.toml
index 191b0f2..6052e17 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,13 +38,11 @@ classifiers = [
 ]
 dependencies = [
     "django<5.2",
+    "psycopg2",
     "backports.zoneinfo;python_version<'3.9'",
 ]
 
 [project.optional-dependencies]
-psycopg2 = [
-    "psycopg2",
-]
 psycopg2-binary = [
     "psycopg2-binary",
 ]
diff --git a/tox.ini b/tox.ini
index 338e3db..e5f9267 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,6 @@ DJANGO =
 [testenv]
 deps =
     coverage
-    psycopg2-binary>=2.7
     pytest
     pytest-cov
     mock>=2.0
@@ -41,6 +40,7 @@ deps =
     dj50: Django>=5.0,<5.1
     dj51: Django>=5.1,<5.2
     djmain: https://github.com/django/django/archive/main.tar.gz
+    .[psycopg2-binary]
 setenv =
     DJANGO_SETTINGS_MODULE = settings
     PYTHONPATH = {toxinidir}