diff --git a/pyproject.toml b/pyproject.toml
index 7165ac8..3bb137a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 
 dependencies = [
   "rdflib >= 7.0.0",
-  "pydantic ~= 2.5.2",
+  "pydantic >= 2.5.2,< 2.9.0",
   "ruamel.yaml ~= 0.18.5",
   "email-validator == 2.1.0.post1",
   "python-dateutil ~= 2.8",