diff --git a/pyproject.toml b/pyproject.toml
index 9cfb09f..6c272be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ python-preference = "managed"
 # Dev tools are added in Epic 2; groups reserved so root tasks stay stable.
 [dependency-groups]
 dev = [
-    "ruff>=0.12.0",
+    "ruff>=0.15.21",
     "pyright>=1.1.400",
     "pre-commit>=4.0.0",
     "pytest-cov>=6.0.0",