diff --git a/products/01-llm-cost-router/Dockerfile b/products/01-llm-cost-router/Dockerfile
index ee967d6..ec25764 100644
--- a/products/01-llm-cost-router/Dockerfile
+++ b/products/01-llm-cost-router/Dockerfile
@@ -1,5 +1,5 @@
 # P1: dd0c/route — Rust multi-binary (proxy, api, worker)
-FROM rust:1.79-slim AS builder
+FROM rust:1.85-slim AS builder
 WORKDIR /app
 RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/lib/apt/lists/*
 COPY Cargo.toml Cargo.lock* ./