diff --git a/pyproject.toml b/pyproject.toml
index 4e1e218..7ddd35a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -118,7 +118,7 @@ optional-dependencies.develop = [
   "poethepoet<0.28",
   "pyproject-fmt<2.3",
   "ruff<0.6",
-  "validate-pyproject<0.19",
+  "validate-pyproject<0.20",
 ]
 optional-dependencies.doc = [
   "furo==2024.1.29",               # Check visited link style on newer versions!