diff --git a/docker/Dockerfile b/docker/Dockerfile
index 10054cb69..601cc69ee 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -33,6 +33,7 @@ RUN apt-get update \
 
 # Install gazebo dependencies
 RUN /bin/sh -c 'echo "deb [trusted=yes] http://packages.osrfoundation.org/gazebo/ubuntu-stable `lsb_release -cs` main" > /etc/apt/sources.list.d/gazebo-stable.list' \
+ && /bin/sh -c 'echo "deb [trusted=yes] http://packages.osrfoundation.org/gazebo/ubuntu-prerelease `lsb_release -cs` main" > /etc/apt/sources.list.d/gazebo-prerelease.list' \
  && /bin/sh -c 'wget http://packages.osrfoundation.org/gazebo.key -O - | apt-key add -' \
  && apt-get update \
  && apt-get install -y \
diff --git a/tutorials/08_relay.md b/tutorials/08_relay.md
index cda1a2963..7886d560d 100644
--- a/tutorials/08_relay.md
+++ b/tutorials/08_relay.md
@@ -28,11 +28,9 @@ install Docker following any of the existing guides available
 ([here](https://docs.docker.com/get-docker/)'s one).
 
 We're going to build a Docker image and run it inside your host computer.
-Download the [build.bash](https://github.com/gazebosim/gz-transport/raw/main/docker/build.bash), [run.bash](https://github.com/gazebosim/gz-transport/raw/main/docker/run.bash) and
-[Dockerfile](https://github.com/gazebosim/gz-transport/raw/main/docker/gz-transport/Dockerfile) files.
-
+Download the Dockerfile:
 ```{.sh}
-wget https://github.com/gazebosim/gz-transport/raw/main/docker/gz-transport/Dockerfile -O Dockerfile
+wget https://github.com/gazebosim/gz-transport/raw/main/docker/Dockerfile -O Dockerfile
 ```
 
 Now, it's time to build the Docker image: