diff --git a/pyproject.toml b/pyproject.toml
index 5488186..6385868 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
   "build>=1.2.2,<1.4.0",
-  "ruff>=0.12.2,<0.14.0",
+  "ruff>=0.12.2,<0.15.0",
   "sphinx>=7.3.7,<8.2.0",
   "scikit-learn>=1.5,<1.8",
   "pre-commit>=4.0.1,<4.4.0"
@@ -44,7 +44,7 @@ homepage = "https://github.com/CyberAgentAILab/python-dte-adjustment"
 [tool.uv]
 dev-dependencies = [
   "build>=1.2.2,<1.4.0",
-  "ruff>=0.12.2,<0.14.0",
+  "ruff>=0.12.2,<0.15.0",
   "sphinx>=7.3.7,<8.2.0",
   "scikit-learn>=1.5,<1.8",
   "pre-commit>=4.0.1,<4.4.0"