diff --git a/constance/models.py b/constance/models.py
index 5d6eeece..49213b47 100644
--- a/constance/models.py
+++ b/constance/models.py
@@ -4,7 +4,7 @@
 
 class Constance(models.Model):
     key = models.CharField(max_length=255, unique=True)
-    value = models.TextField(null=True, blank=True)
+    value = models.TextField(null=True, blank=True, editable=False)
 
     class Meta:
         verbose_name = _('constance')
diff --git a/pyproject.toml b/pyproject.toml
index 1b53fc77..32e31233 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "django-constance"
-version = "4.0.0"
+version = "4.0.1"
 description = "Django live settings with pluggable backends, including Redis."
 readme = "README.rst"
 license = { text = "BSD" }
diff --git a/tox.ini b/tox.ini
index d549ddab..4f95cfde 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,9 @@
 [tox]
 isolated_build = true
 envlist =
-    py{38,39,310,311,312}-dj{42}-{unittest,pytest}
-    py{310,311,312}-dj{50}-{unittest,pytest}
-    py{310,311,312}-dj{main}-{unittest,pytest}
+    py{38,39,310,311,312}-dj{42}-{unittest,pytest,checkmigrations}
+    py{310,311,312}-dj{50}-{unittest,pytest,checkmigrations}
+    py{310,311,312}-dj{main}-{unittest,pytest,checkmigrations}
 skip_missing_interpreters = True
 
 [testenv]
@@ -25,6 +25,7 @@ commands =
     unittest: coverage report
     unittest: coverage xml
     pytest: pytest --cov=. --ignore=.tox --disable-pytest-warnings --cov-report=xml --cov-append {toxinidir}
+    checkmigrations: django-admin makemigrations --check --dry-run
 setenv =
     PYTHONPATH = {toxinidir}
     PYTHONDONTWRITEBYTECODE = 1