diff --git a/pyproject.toml b/pyproject.toml
index bdb8333..af34a2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -107,7 +107,7 @@ develop = [
   "pyproject-fmt<1.9",
   "ruff<0.5",
   "sphinx-autobuild==2021.3.14", # Newer versions stopped "watching" appropriately?
-  "validate-pyproject<0.17",
+  "validate-pyproject<0.18",
 ]
 docs = [
   "furo",