diff --git a/backend/Dockerfile.test-rust b/backend/Dockerfile.test-rust
index 6f1ed46..47771b0 100644
--- a/backend/Dockerfile.test-rust
+++ b/backend/Dockerfile.test-rust
@@ -1,5 +1,5 @@
 # planner: produce recipe.json
-FROM rust:1.89-slim AS planner
+FROM docker.io/rust:1.89-slim AS planner
 WORKDIR /app
 RUN apt-get update && apt-get install -y --no-install-recommends pkg-config libssl-dev ca-certificates postgresql-client curl && rm -rf /var/lib/apt/lists/*
 RUN cargo install --locked cargo-chef
@@ -7,7 +7,7 @@ COPY . .
 RUN cargo chef prepare --recipe-path recipe.json
 
 # deps: compile only external crates
-FROM rust:1.89-slim AS deps
+FROM docker.io/rust:1.89-slim AS deps
 WORKDIR /app
 RUN apt-get update && apt-get install -y --no-install-recommends pkg-config libssl-dev ca-certificates postgresql-client curl && rm -rf /var/lib/apt/lists/*
 RUN cargo install --locked cargo-chef
@@ -16,7 +16,7 @@ COPY --from=planner /app/recipe.json recipe.json
 RUN cargo chef cook --release --recipe-path recipe.json
 
 # builder: compile local workspace crates using cached deps
-FROM rust:1.89-slim AS builder
+FROM docker.io/rust:1.89-slim AS builder
 WORKDIR /app
 COPY --from=deps /usr/local/cargo /usr/local/cargo
 COPY --from=deps /usr/local/rustup /usr/local/rustup
@@ -25,7 +25,7 @@ COPY . .
 RUN cargo build --release --locked
 
 # runtime: minimal test environment
-FROM rust:1.89-slim AS runtime
+FROM docker.io/rust:1.89-slim AS runtime
 RUN apt-get update && apt-get install -y --no-install-recommends postgresql-client curl && rm -rf /var/lib/apt/lists/*
 WORKDIR /workspace/backend
 CMD ["sleep", "infinity"]
\ No newline at end of file