diff --git a/Dockerfile b/Dockerfile
index cf9a36d..4ce0b04 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,7 @@
 # --- Build stage: produce static dist/ ---
-FROM node:22-alpine AS build
+# Debian (glibc), not alpine: Astro 7's Rust toolchain (rolldown/oxc) has
+# flaky musl native bindings, and the lockfile is resolved for linux-x64-gnu.
+FROM node:22-slim AS build
 WORKDIR /app
 
 # Install deps against the lockfile for reproducible builds.