diff --git a/build.py b/build.py
index 12c3fdb1b..34d009abf 100755
--- a/build.py
+++ b/build.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env -S uv run --no-dev
+#!/usr/bin/env -S uv run --no-dev --frozen
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at https://mozilla.org/MPL/2.0/.