diff --git a/pyproject.toml b/pyproject.toml
index 3854983..c63f10e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ dependencies = [
 [dependency-groups]
 dev = [
   "coverage==7.13.0",
-  "filelock==3.20.1",
+  "filelock==3.20.3",
   "mypy==1.19.1",
   "pre-commit==4.5.1",
   "ruff==0.14.10",
diff --git a/requirements.txt b/requirements.txt
index 342b6ea..cad4c5c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ cfgv==3.4.0
 coverage==7.13.0
 distlib==0.3.9
     # via virtualenv
-filelock==3.20.1
+filelock==3.20.3
     # via virtualenv
 identify==2.6.4
     # via pre-commit