diff --git a/docker/Dockerfile b/docker/Dockerfile
index fa618b2..bda27c6 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -316,7 +316,7 @@ RUN wget -O skype.deb -q https://go.skype.com/skypeforlinux-64.deb && \
   rm skype.deb
 
 # Install slack
-RUN wget -O slack.deb -nv https://downloads.slack-edge.com/linux_releases/slack-desktop-4.1.1-amd64.deb && \
+RUN wget -O slack.deb -nv https://downloads.slack-edge.com/linux_releases/slack-desktop-4.9.1-amd64.deb && \
   dpkg -i slack.deb || apt-get install -qq --fix-broken && \
   rm slack.deb
 
diff --git a/docker/scripts/exec-root.sh b/docker/scripts/exec-root.sh
index 0cc44e7..ebdf4b0 100755
--- a/docker/scripts/exec-root.sh
+++ b/docker/scripts/exec-root.sh
@@ -5,4 +5,5 @@ eval "$($REPO_ROOT/docker/scripts/environment.sh)"
 
 docker exec \
   --interactive \
+  --user root \
   $DESKTOP_ENVIRONMENT_CONTAINER_IMAGE zsh -c "$*"
diff --git a/docker/scripts/exec.sh b/docker/scripts/exec.sh
index d5d7776..01f491c 100755
--- a/docker/scripts/exec.sh
+++ b/docker/scripts/exec.sh
@@ -6,5 +6,4 @@ eval "$($REPO_ROOT/docker/scripts/environment.sh)"
 docker exec \
   --interactive \
   --tty \
-  --user $DESKTOP_ENVIRONMENT_USER \
   $DESKTOP_ENVIRONMENT_CONTAINER_IMAGE zsh -c "$*"
diff --git a/docker/scripts/start.sh b/docker/scripts/start.sh
index eecbeb7..012176c 100755
--- a/docker/scripts/start.sh
+++ b/docker/scripts/start.sh
@@ -33,7 +33,6 @@ docker run \
   --network host \
   --rm \
   --security-opt apparmor:unconfined \
-  --user $DESKTOP_ENVIRONMENT_USER \
   --volume /dev/displaylink:/dev/displaylink \
   --volume /dev/shm:/dev/shm \
   --volume /run/udev:/run/udev \
diff --git a/docker/scripts/test.sh b/docker/scripts/test.sh
index 30f95ce..42322fe 100755
--- a/docker/scripts/test.sh
+++ b/docker/scripts/test.sh
@@ -15,11 +15,12 @@ docker run \
   --env DESKTOP_ENVIRONMENT_USER \
   --name $DESKTOP_ENVIRONMENT_CONTAINER_NAME \
   --rm \
-  --user $DESKTOP_ENVIRONMENT_USER \
   --workdir $DESKTOP_ENVIRONMENT_USER_HOME \
   $DESKTOP_ENVIRONMENT_REGISTRY/$DESKTOP_ENVIRONMENT_CONTAINER_IMAGE:$DESKTOP_ENVIRONMENT_CONTAINER_TAG \
   sleep infinity
 
+exit 1
+
 # Wait until the desktop environment test container is running before proceeding
 until docker inspect $DESKTOP_ENVIRONMENT_CONTAINER_NAME | grep Status | grep -m 1 running >/dev/null; do sleep 1; done