diff --git a/pyproject.toml b/pyproject.toml
index e922366..6c2d1c8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
 dependencies = [
     "lxml==5.1.0",
     "importlib_resources==5.12.0",
-    "pydantic==2.5.3",
+    "pydantic>=2.5.3,<3.0.0",
 ]
 
 [project.optional-dependencies]