diff --git a/fhevm-engine/coprocessor/Dockerfile b/fhevm-engine/coprocessor/Dockerfile
index 2be6e3b4..a4a60291 100644
--- a/fhevm-engine/coprocessor/Dockerfile
+++ b/fhevm-engine/coprocessor/Dockerfile
@@ -5,22 +5,23 @@ WORKDIR /app
 
 # Install dependencies
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends protobuf-compiler && \
+    apt-get install -y --no-install-recommends protobuf-compiler=3.12.4* && \
     rm -rf /var/lib/apt/lists/*
 
 COPY ./fhevm-engine/ ./fhevm-engine/
+COPY ./proto/ ./proto/
 
 WORKDIR /app/fhevm-engine/coprocessor
 
-RUN cargo fetch
-RUN SQLX_OFFLINE=true cargo build --release
+RUN cargo fetch && \
+    SQLX_OFFLINE=true cargo build --release
 
 # Stage 2: Final image
 FROM debian:bullseye-slim
 
 RUN useradd -m zama
 
-COPY --from=build /app/fhevm-engine/coprocessor/target/release/coprocessor /usr/local/bin
+COPY --from=build /app/fhevm-engine/target/release/coprocessor /usr/local/bin/
 
 RUN chown zama:zama /usr/local/bin/coprocessor && \
     chmod 500 /usr/local/bin/coprocessor