diff --git a/pyproject.toml b/pyproject.toml
index f0e82ec52c9..67bfee001b4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dev = [
     "ruff>=0.7.1",
     # forced transitive bumps
     "urllib3>=2.6.3",
-    "filelock>=3.20.3",
+    "filelock>=4.2.1",
 ]
 
 [tool.uv]
diff --git a/uv.lock b/uv.lock
index be0882bdf37..d594aa89623 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 3
+revision = 5
 requires-python = ">=3.11"
 resolution-markers = [
     "python_full_version >= '3.12'",
@@ -330,11 +330,11 @@ wheels = [
 
 [[package]]
 name = "filelock"
-version = "3.20.3"
+version = "4.2.1"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/1d/65/ce7f1b70157833bf3cb851b556a37d4547ceafc158aa9b34b36782f23696/filelock-3.20.3.tar.gz", hash = "sha256:18c57ee915c7ec61cff0ecf7f0f869936c7c30191bb0cf406f1341778d0834e1", size = 19485, upload-time = "2026-01-09T17:55:05.421Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d5/98/771d8ca889f220d7d7e352addf500666368f0fd081c6080a83767580c6e4/filelock-4.2.1.tar.gz", hash = "sha256:c4c937ccac2a813cee448e662a56366cfb374c0f8702e75f295c412cc1c5d5a3", size = 650997, upload-time = "2026-10-17T16:48:14.435Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/b5/36/7fb70f04bf00bc646cd5bb45aa9eddb15e19437a28b8fb2b4a5249fac770/filelock-3.20.3-py3-none-any.whl", hash = "sha256:4b0dda527ee31078689fc205ec4f1c1bf7d56cf88b6dc9426c4f230e46c2dce1", size = 16701, upload-time = "2026-01-09T17:55:04.334Z" },
+    { url = "https://files.pythonhosted.org/packages/28/00/db89d339bc4ecdc8087fa7b8607ba22ffc27bf96286f340c9620bea428b3/filelock-4.2.1-py3-none-any.whl", hash = "sha256:7be2662e9e826b9bba28afc0f843a123280d799a2ea44bb5d35ccec67905ae44", size = 162455, upload-time = "2026-10-17T16:48:12.937Z" },
 ]
 
 [[package]]
@@ -1536,23 +1536,23 @@ resolution-markers = [
     "python_full_version < '3.12'",
 ]
 dependencies = [
-    { name = "alabaster", marker = "python_full_version < '3.12'" },
-    { name = "babel", marker = "python_full_version < '3.12'" },
-    { name = "colorama", marker = "python_full_version < '3.12' and sys_platform == 'win32'" },
-    { name = "docutils", marker = "python_full_version < '3.12'" },
-    { name = "imagesize", marker = "python_full_version < '3.12'" },
-    { name = "jinja2", marker = "python_full_version < '3.12'" },
-    { name = "packaging", marker = "python_full_version < '3.12'" },
-    { name = "pygments", marker = "python_full_version < '3.12'" },
-    { name = "requests", marker = "python_full_version < '3.12'" },
-    { name = "roman-numerals", marker = "python_full_version < '3.12'" },
-    { name = "snowballstemmer", marker = "python_full_version < '3.12'" },
-    { name = "sphinxcontrib-applehelp", marker = "python_full_version < '3.12'" },
-    { name = "sphinxcontrib-devhelp", marker = "python_full_version < '3.12'" },
-    { name = "sphinxcontrib-htmlhelp", marker = "python_full_version < '3.12'" },
-    { name = "sphinxcontrib-jsmath", marker = "python_full_version < '3.12'" },
-    { name = "sphinxcontrib-qthelp", marker = "python_full_version < '3.12'" },
-    { name = "sphinxcontrib-serializinghtml", marker = "python_full_version < '3.12'" },
+    { name = "alabaster" },
+    { name = "babel" },
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "docutils" },
+    { name = "imagesize" },
+    { name = "jinja2" },
+    { name = "packaging" },
+    { name = "pygments" },
+    { name = "requests" },
+    { name = "roman-numerals" },
+    { name = "snowballstemmer" },
+    { name = "sphinxcontrib-applehelp" },
+    { name = "sphinxcontrib-devhelp" },
+    { name = "sphinxcontrib-htmlhelp" },
+    { name = "sphinxcontrib-jsmath" },
+    { name = "sphinxcontrib-qthelp" },
+    { name = "sphinxcontrib-serializinghtml" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/42/50/a8c6ccc36d5eacdfd7913ddccd15a9cee03ecafc5ee2bc40e1f168d85022/sphinx-9.0.4.tar.gz", hash = "sha256:594ef59d042972abbc581d8baa577404abe4e6c3b04ef61bd7fc2acbd51f3fa3", size = 8710502, upload-time = "2025-12-04T07:45:27.343Z" }
 wheels = [
@@ -1567,23 +1567,23 @@ resolution-markers = [
     "python_full_version >= '3.12'",
 ]
 dependencies = [
-    { name = "alabaster", marker = "python_full_version >= '3.12'" },
-    { name = "babel", marker = "python_full_version >= '3.12'" },
-    { name = "colorama", marker = "python_full_version >= '3.12' and sys_platform == 'win32'" },
-    { name = "docutils", marker = "python_full_version >= '3.12'" },
-    { name = "imagesize", marker = "python_full_version >= '3.12'" },
-    { name = "jinja2", marker = "python_full_version >= '3.12'" },
-    { name = "packaging", marker = "python_full_version >= '3.12'" },
-    { name = "pygments", marker = "python_full_version >= '3.12'" },
-    { name = "requests", marker = "python_full_version >= '3.12'" },
-    { name = "roman-numerals", marker = "python_full_version >= '3.12'" },
-    { name = "snowballstemmer", marker = "python_full_version >= '3.12'" },
-    { name = "sphinxcontrib-applehelp", marker = "python_full_version >= '3.12'" },
-    { name = "sphinxcontrib-devhelp", marker = "python_full_version >= '3.12'" },
-    { name = "sphinxcontrib-htmlhelp", marker = "python_full_version >= '3.12'" },
-    { name = "sphinxcontrib-jsmath", marker = "python_full_version >= '3.12'" },
-    { name = "sphinxcontrib-qthelp", marker = "python_full_version >= '3.12'" },
-    { name = "sphinxcontrib-serializinghtml", marker = "python_full_version >= '3.12'" },
+    { name = "alabaster" },
+    { name = "babel" },
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "docutils" },
+    { name = "imagesize" },
+    { name = "jinja2" },
+    { name = "packaging" },
+    { name = "pygments" },
+    { name = "requests" },
+    { name = "roman-numerals" },
+    { name = "snowballstemmer" },
+    { name = "sphinxcontrib-applehelp" },
+    { name = "sphinxcontrib-devhelp" },
+    { name = "sphinxcontrib-htmlhelp" },
+    { name = "sphinxcontrib-jsmath" },
+    { name = "sphinxcontrib-qthelp" },
+    { name = "sphinxcontrib-serializinghtml" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/cd/bd/f08eb0f4eed5c83f1ba2a3bd18f7745a2b1525fad70660a1c00224ec468a/sphinx-9.1.0.tar.gz", hash = "sha256:7741722357dd75f8190766926071fed3bdc211c74dd2d7d4df5404da95930ddb", size = 8718324, upload-time = "2025-12-31T15:09:27.646Z" }
 wheels = [
@@ -2116,7 +2116,7 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "basedpyright", specifier = ">=1.31" },
-    { name = "filelock", specifier = ">=3.20.3" },
+    { name = "filelock", specifier = ">=4.2.1" },
     { name = "ipython", specifier = ">=8.26.0" },
     { name = "pip", specifier = ">=23.3.2" },
     { name = "pytest", specifier = ">=7.4.0" },