diff --git a/services/differ/Dockerfile b/services/differ/Dockerfile
index 029cd8e..e2ecf33 100644
--- a/services/differ/Dockerfile
+++ b/services/differ/Dockerfile
@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 # Builder is Debian 12 (bookworm) to match the glibc of the distroless runtime.
-FROM rust:1.95-bookworm@sha256:6258907abe69656e41cd992e0b705cdcfabcbbe3db374f92ed2d47121282d4a1 AS build
+FROM rust:1.97-bookworm@sha256:7d0723df719e7f213b69dc7c8c595985c3f4b060cfbee4f7bc0e347a86fe3b6a AS build
 # protoc is required by build.rs (prost-build invokes it to compile the proto).
 RUN apt-get update \
     && apt-get install -y --no-install-recommends protobuf-compiler \