diff --git a/.github/workflows/build/Dockerfile b/.github/workflows/build/Dockerfile
index 1284b943a..1606359b8 100644
--- a/.github/workflows/build/Dockerfile
+++ b/.github/workflows/build/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.6.0
+# syntax=docker/dockerfile:1.6.0@sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021
 FROM --platform=$BUILDPLATFORM busybox:latest@sha256:5c63a9b46e7139d2d5841462859edcbbf57f238af891b6096578e5894cfe5ae2 AS env
 ARG TARGETPLATFORM
 ARG BINARY_NAME=rust-ci-test