diff --git a/Dockerfile b/Dockerfile
index d7a2b86..b453783 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -44,8 +44,9 @@ RUN python3 /app/code/patch_ui_strings.py
 # Inject branding into built HTML (dist) before image is packaged
 # rebuild marker 20261019-$(date +%s)
 RUN sed -i 's|<title>LibreChat</title>|<title>Inference Co‑op</title>|' /app/code/librechat/client/dist/index.html && \
-    sed -i '/<title>Inference Co‑op<\/title>/a <link rel="stylesheet" href="assets/custom.css">' /app/code/librechat/client/dist/index.html && \
-    sed -i '/<link rel="stylesheet" href="assets\/custom.css">/a <script src="assets/custom2.js"></script>' /app/code/librechat/client/dist/index.html && \
+    sed -i '/<title>Inference Co‑op<\\/title>/a <link rel="stylesheet" href="assets/custom.css">' /app/code/librechat/client/dist/index.html && \
+    sed -i '/<link rel="stylesheet" href="assets\\/custom.css">/a <script src="assets/custom2.js"></script>' /app/code/librechat/client/dist/index.html && \
+    sed -i "s|</title>|</title>\\n    <meta name=\"x-coop-build\" content=\"$(date +%s)\">|" /app/code/librechat/client/dist/index.html && \
     sed -i 's|assets/logo.svg|assets/logo.svg?v=3|g' /app/code/librechat/client/dist/assets/index.*.js && \
     rm -f /app/code/librechat/client/dist/assets/index.*.js.gz /app/code/librechat/client/dist/assets/index.*.js.br