diff --git a/repo/pyproject.toml b/repo/pyproject.toml
index 3d760a5..a830b09 100644
--- a/repo/pyproject.toml
+++ b/repo/pyproject.toml
@@ -30,7 +30,7 @@ tuf-on-ci-update-targets = "tuf_on_ci:update_targets"
 [project.optional-dependencies]
 lint = [
   "mypy == 1.14.1",
-  "ruff == 0.8.4",
+  "ruff == 0.8.6",
 ]
 
 [tool.hatch.version]
diff --git a/signer/pyproject.toml b/signer/pyproject.toml
index ac4a81a..d4784bd 100644
--- a/signer/pyproject.toml
+++ b/signer/pyproject.toml
@@ -24,7 +24,7 @@ tuf-on-ci-sign = "tuf_on_ci_sign:sign"
 [project.optional-dependencies]
 lint = [
   "mypy == 1.14.1",
-  "ruff == 0.8.4",
+  "ruff == 0.8.6",
 ]
 
 [tool.hatch.version]