diff --git a/infra/Dockerfile.server b/infra/Dockerfile.server
index 0d71f48..4856aa3 100644
--- a/infra/Dockerfile.server
+++ b/infra/Dockerfile.server
@@ -1,5 +1,5 @@
 # ── Build stage ───────────────────────────────────────────────────────────────
-FROM rust:1.77-slim AS builder
+FROM rust:1.77-slim-bookworm AS builder
 
 WORKDIR /build