diff --git a/pyproject.toml b/pyproject.toml
index cf06805..023eb2a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-dev = ["pytest>=8.0", "jsonschema>=4.18", "ruff>=0.5", "pytest-cov>=5.0"]
+dev = ["pytest>=8.0", "jsonschema>=4.18", "ruff>=0.15.18,<0.16", "pytest-cov>=5.0"]
 
 [tool.setuptools.packages.find]
 include = ["scripts*"]