diff --git a/pyproject.toml b/pyproject.toml
index bc887b2fa..de64b8483 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -66,7 +66,7 @@ optional = [
   "coreapi==2.3.3",
   "coreschema==0.0.4",
   "django-filter",
-  "django-guardian>=2.4.0,<3.3",
+  "django-guardian>=2.4.0,<3.4",
   "inflection==0.5.1",
   "legacy-cgi; python_version>='3.13'",
   "markdown>=3.3.7",