diff --git a/Dockerfile b/Dockerfile
index ad16d72..3df3469 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,7 @@ RUN cargo chef prepare --recipe-path recipe.json
 FROM base AS builder
 # HACK: Now we can use unstable feature while on stable rust!
 ENV RUSTC_BOOTSTRAP=1
+COPY ./rust-toolchain.toml .
 COPY --from=planner /app/recipe.json recipe.json
 RUN cargo chef cook --release --recipe-path recipe.json