diff --git a/third_party/perfetto/.vpython3 b/third_party/perfetto/.vpython3
new file mode 100644
index 00000000000..c4e0e867ec1
--- /dev/null
+++ b/third_party/perfetto/.vpython3
@@ -0,0 +1,4 @@
+# src/gn/write_buildflag_header.py requires at least 3.9 because
+# it uses type hints like list[str].
+
+python_version: "3.11"