diff --git a/Dockerfile b/Dockerfile
index 8bb87f8..2ce294d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM rust:1.66
 
 RUN dpkg --add-architecture arm64 && dpkg --add-architecture armhf
 RUN apt-get update -yqq && apt-get install -yqq --no-install-recommends capnproto build-essential cmake clang libclang-dev jq libc6-arm64-cross libc6-dev-arm64-cross gcc-aarch64-linux-gnu libssl-dev:arm64 libc6-armhf-cross libc6-dev-armhf-cross gcc-arm-linux-gnueabihf libssl-dev:armhf
-RUN rustup target add aarch64-unknown-linux-gnu
-RUN rustup target add armv7-unknown-linux-gnueabihf
+RUN rustup target add --toolchain 1.66 aarch64-unknown-linux-gnu
+RUN rustup target add --toolchain 1.66 armv7-unknown-linux-gnueabihf
 RUN rustup component add clippy rustfmt
 RUN cargo install cargo2junit