diff --git a/tuftool/Dockerfile b/tuftool/Dockerfile
index bfd8d1ac..601af6d8 100644
--- a/tuftool/Dockerfile
+++ b/tuftool/Dockerfile
@@ -2,6 +2,6 @@
 
 FROM rust:slim
 RUN apt update && apt install -y openssl
-RUN cargo install --force tuftool
+RUN cargo install --force --locked tuftool
 RUN mkdir /share
 ENTRYPOINT ["tuftool"]
diff --git a/tuftool/README.md b/tuftool/README.md
index 637a5b3e..372595b6 100644
--- a/tuftool/README.md
+++ b/tuftool/README.md
@@ -139,10 +139,10 @@ tuftool download \
 
 You can build a simple container image to avoid needing to install the Rust toolchain and dependencies or your local machine.
 
-To build the image run use Docker or Finch (same argument syntax, just replace `finch` for `docker`):
+To build the image use Docker or Finch (same argument syntax, just replace 
+`docker` for `finch`):
 
 ```shell
-cd finch
 docker build -t tuftool .
 ```