diff --git a/rust/README.md b/rust/README.md
index 0f7cb276a..9e080bb0f 100644
--- a/rust/README.md
+++ b/rust/README.md
@@ -91,7 +91,7 @@ COPY . .
 RUN cargo install --path .
 
 FROM debian:buster-slim
-RUN apt-get update && apt-get install -y extra-runtime-dependencies
+RUN apt-get update && apt-get install -y extra-runtime-dependencies && rm -rf /var/lib/apt/lists/*
 COPY --from=builder /usr/local/cargo/bin/myapp /usr/local/bin/myapp
 CMD ["myapp"]
 ```