diff --git a/pyproject.toml b/pyproject.toml
index 87c2ce551..505e9a3e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,7 @@ dependencies = [
   "packaging>=23.1",
   "platformdirs>=3.2",
   "pluggy>=1",
-  "pyproject-api>=1.5.1",
+  "pyproject-api<1.6",
   'tomli>=2.0.1; python_version < "3.11"',
   'typing-extensions>=4.5; python_version < "3.8"',
   "virtualenv>=20.21",