diff --git a/debian13/Dockerfile b/debian13/Dockerfile
index 77c9831..9899448 100644
--- a/debian13/Dockerfile
+++ b/debian13/Dockerfile
@@ -23,9 +23,9 @@ RUN sed -i 's|deb.debian.org|mirrors.ustc.edu.cn|g' /etc/apt/sources.list.d/debi
 
 RUN git config --global url."https://wangguofang.net/github.com/".insteadOf "https://github.com/"
 
-RUN --mount=type=bind,from=sources,source=rust-1.99.1.tar.xz,target=/tmp/rust.tar.xz \
+RUN --mount=type=bind,from=sources,source=rust,target=/tmp/rust \
     mkdir rust-src \
-    && tar -xJf /tmp/rust.tar.xz -C rust-src --strip-components=1 \
+    && tar -xJf "/tmp/rust/rust-1.99.1-$(uname -m)-unknown-linux-gnu.tar.xz" -C rust-src --strip-components=1 \
     && rust-src/install.sh --prefix=/usr/local --without=rust-docs \
     && rm -rf rust-src
 
diff --git a/fetch-sources.sh b/fetch-sources.sh
index da0a0cc..540adf8 100755
--- a/fetch-sources.sh
+++ b/fetch-sources.sh
@@ -135,16 +135,16 @@ fetch lz4-v1.10.0.tar.gz \
 fetch arrow-apache-arrow-25.0.1.tar.gz \
     https://wangguofang.net/github.com/apache/arrow/archive/apache-arrow-25.0.1.tar.gz
 # Rust ships one standalone tarball per architecture, named after `uname -m` (x86_64, aarch64).
-# The Dockerfiles mount it under the architecture-neutral name rust-1.99.1.tar.xz (a hard link
-# that is refreshed on every run, so switching architectures never leaves a stale archive).
+# It lives in its own sources/rust/ directory, which the Dockerfiles mount as a whole and pick the
+# archive from by architecture, so adding other sources never invalidates the Rust build layer.
 rust_triple="$(uname -m)-unknown-linux-gnu"
-fetch "rust-1.99.1-$rust_triple.tar.xz" \
+mkdir -p rust
+fetch "rust/rust-1.99.1-$rust_triple.tar.xz" \
     "https://mirrors.cloud.tencent.com/rustup/dist/rust-1.99.1-$rust_triple.tar.xz" \
     "https://mirrors.tuna.tsinghua.edu.cn/rustup/dist/2026-10-15/rust-1.99.1-$rust_triple.tar.xz" \
     "https://repo.huaweicloud.com/rustup/dist/rust-1.99.1-$rust_triple.tar.xz" \
     "https://mirrors.ustc.edu.cn/rust-static/dist/rust-1.99.1-$rust_triple.tar.xz" \
     "https://static.rust-lang.org/dist/rust-1.99.1-$rust_triple.tar.xz"
-ln -f "rust-1.99.1-$rust_triple.tar.xz" rust-1.99.1.tar.xz
 fetch duckdb-v1.5.6.tar.gz \
     https://wangguofang.net/github.com/duckdb/duckdb/archive/v1.5.6.tar.gz
 fetch duckdb-ui-0628932f74b1e2e9eaf68a05b22d737455541dca.tar.gz \
diff --git a/rocky9/Dockerfile b/rocky9/Dockerfile
index e4417bf..1e3e8b6 100644
--- a/rocky9/Dockerfile
+++ b/rocky9/Dockerfile
@@ -36,9 +36,9 @@ RUN dnf install --assumeyes --enablerepo=crb \
 
 RUN git config --global url."https://wangguofang.net/github.com/".insteadOf "https://github.com/"
 
-RUN --mount=type=bind,from=sources,source=rust-1.99.1.tar.xz,target=/tmp/rust.tar.xz \
+RUN --mount=type=bind,from=sources,source=rust,target=/tmp/rust \
     mkdir rust-src \
-    && tar -xJf /tmp/rust.tar.xz -C rust-src --strip-components=1 \
+    && tar -xJf "/tmp/rust/rust-1.99.1-$(uname -m)-unknown-linux-gnu.tar.xz" -C rust-src --strip-components=1 \
     && rust-src/install.sh --prefix=/usr/local --without=rust-docs \
     && rm -rf rust-src