diff --git a/package_test/tests.py b/package_test/tests.py
index abeb65a..f1e7a4a 100644
--- a/package_test/tests.py
+++ b/package_test/tests.py
@@ -195,6 +195,19 @@ class FieldTest(TestCase):
 
         with pytest.raises(ValidationError):
             model.save()
+    
+    def test_encrypted_boolean_field_preserves_true_false_and_none(self) -> None:
+        true_obj = TestModel.objects.create(boolean=True)
+        false_obj = TestModel.objects.create(boolean=False)
+        none_obj = TestModel.objects.create(boolean=None)
+
+        true_obj.refresh_from_db()
+        false_obj.refresh_from_db()
+        none_obj.refresh_from_db()
+
+        assert true_obj.boolean is True
+        assert false_obj.boolean is False
+        assert none_obj.boolean is None
 
     def test_json_field_encrypted(self) -> None:
         dict_values = {
diff --git a/src/encrypted_fields/fields.py b/src/encrypted_fields/fields.py
index 33a0622..77984f8 100644
--- a/src/encrypted_fields/fields.py
+++ b/src/encrypted_fields/fields.py
@@ -174,7 +174,11 @@ class EncryptedEmailField(EncryptedFieldMixin, models.EmailField):
 
 
 class EncryptedBooleanField(EncryptedFieldMixin, models.BooleanField):
-    pass
+    def get_prep_value(self, value: _TypeAny) -> _TypeAny:
+        value = models.BooleanField.get_prep_value(self, value)
+        if value is None:
+            return None
+        return self.f.encrypt(str(value).encode("utf-8")).decode("utf-8")
 
 
 class EncryptedJSONField(EncryptedFieldMixin, models.JSONField):