diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index e6b42d7b..b130c0e8 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -8,7 +8,7 @@ version = "0.0.0"
 description = "DevForge backend (FastAPI)"
 # libsql-experimental（sqlalchemy-libsql 経由）が Python 3.14 未対応のため 3.13 系に固定する
 # （renovate.json5 の allowedVersions "<3.14" と同期）
-requires-python = "==3.13.*"
+requires-python = "==3.13.14"
 dependencies = [
     "fastapi==0.139.2",
     # starlette は fastapi の推移的依存だが、PYSEC-2026-161（Host ヘッダ未検証による認証バイパス）
diff --git a/backend/uv.lock b/backend/uv.lock
index ac7434cc..828c7f5d 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -1,6 +1,6 @@
 version = 1
 revision = 3
-requires-python = "==3.13.*"
+requires-python = "==3.13.14"
 
 [[package]]
 name = "alembic"