diff --git a/pyproject.toml b/pyproject.toml
index f2147cf26..ff0b9c0af 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -159,7 +159,7 @@ all = [
 dev = [
     "pytest>=9.0.3; python_version >= '3.10'",
     "pytest-asyncio>=0.23",
-    "ruff>=0.15.22,<0.17",
+    "ruff>=0.15.22,<0.18",
     "pyright==1.1.414",
 ]
 # Everything needed to run the general offline gate in CI (lint + all safe extras-gated
@@ -170,7 +170,7 @@ dev = [
 test = [
     "pytest>=9.0.3; python_version >= '3.10'",
     "pytest-asyncio>=0.23",
-    "ruff>=0.15.22,<0.17",
+    "ruff>=0.15.22,<0.18",
     "pyright==1.1.414",
     "python-dotenv>=1.0",
     "uvicorn[standard]>=0.29",
diff --git a/tests/test_release_infrastructure.py b/tests/test_release_infrastructure.py
index 4449d10c0..301666521 100644
--- a/tests/test_release_infrastructure.py
+++ b/tests/test_release_infrastructure.py
@@ -453,7 +453,7 @@ def test_ci_linter_is_bounded_to_the_verified_release_series():
     # is not stable across minor releases -- 0.16 widened it from 59 rules to 413, which
     # would have turned `ruff check .` red on unchanged code. Pinning `select` explicitly
     # is what actually bounds CI, so the bound and the rule set are asserted together.
-    assert pyproject.count('"ruff>=0.15.22,<0.17"') == 2
+    assert pyproject.count('"ruff>=0.15.22,<0.18"') == 2
     assert 'select = ["E4", "E7", "E9", "F"]' in pyproject