From 14e84014e5416dcb065cb465066b2989fdedb55f Mon Sep 17 00:00:00 2001
From: "renovate[bot]" <29139614+renovate[bot]@users.noreply.github.com>
Date: Sun, 15 Feb 2026 09:09:07 +0000
Subject: [PATCH] chore(deps): update docker/dockerfile docker tag to v1.21

---
 .../resources/challenges/challenge-51/Dockerfile_challenge51    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/resources/challenges/challenge-51/Dockerfile_challenge51 b/src/main/resources/challenges/challenge-51/Dockerfile_challenge51
index e86bc97d4..06dab2f29 100644
--- a/src/main/resources/challenges/challenge-51/Dockerfile_challenge51
+++ b/src/main/resources/challenges/challenge-51/Dockerfile_challenge51
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.20
+# syntax=docker/dockerfile:1.21
 FROM debian:stable-slim
 
 RUN --mount=type=secret,id=db_user \