diff --git a/infra/Dockerfile.server b/infra/Dockerfile.server
index bc16b97..4c7d45d 100644
--- a/infra/Dockerfile.server
+++ b/infra/Dockerfile.server
@@ -6,7 +6,7 @@ RUN apt-get update && apt-get install -y \
     musl-tools \
     && rm -rf /var/lib/apt/lists/*
 
-RUN rustup target add aarch64-unknown-linux-musl
+RUN rustup target add armv7-unknown-linux-gnueabihf
 
 WORKDIR /build
 
@@ -14,12 +14,12 @@ WORKDIR /build
 COPY Cargo.toml Cargo.lock* ./
 COPY server/Cargo.toml ./server/
 RUN mkdir -p server/src && echo 'fn main(){}' > server/src/main.rs
-RUN cargo build --release --target aarch64-unknown-linux-musl -p hiy-server 2>/dev/null || true
+RUN cargo build --release --target armv7-unknown-linux-gnueabihf -p hiy-server 2>/dev/null || true
 RUN rm -f server/src/main.rs
 
 # Build actual source.
 COPY server/src ./server/src
-RUN touch server/src/main.rs && cargo build --release --target aarch64-unknown-linux-musl -p hiy-server
+RUN touch server/src/main.rs && cargo build --release --target armv7-unknown-linux-gnueabihf -p hiy-server
 
 # ── Runtime stage ─────────────────────────────────────────────────────────────
 FROM debian:bookworm-slim
@@ -34,7 +34,7 @@ RUN apt-get update && apt-get install -y \
     docker.io \
     && rm -rf /var/lib/apt/lists/*
 
-COPY --from=builder /build/target/aarch64-unknown-linux-musl/release/hiy-server /usr/local/bin/hiy-server
+COPY --from=builder /build/target/armv7-unknown-linux-gnueabihf/release/hiy-server /usr/local/bin/hiy-server
 
 WORKDIR /app