diff --git a/Dockerfile b/Dockerfile
index e35694c..1894d07 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,14 +9,16 @@ FROM ubuntu:24.04
 
 # Install packages required to run the tests:
 RUN apt-get update \
- && apt-get install -y apt-utils \
- && apt-get install -y \
+ && apt-get install --yes --no-install-recommends \
+        ca-certificates \
         curl \
         jq \
         make \
         perl \
         xz-utils \
- && true
+ && apt-get purge --auto-remove -y \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
 
 # Install a specific version of shellcheck:
 RUN curl -sSOL https://github.com/koalaman/shellcheck/releases/download/v0.10.0/shellcheck-v0.10.0.linux.x86_64.tar.xz \
diff --git a/bin/run-in-docker.sh b/bin/run-in-docker.sh
index 15d478a..af248fe 100755
--- a/bin/run-in-docker.sh
+++ b/bin/run-in-docker.sh
@@ -39,7 +39,6 @@ docker build --rm -t exercism/yamlscript-test-runner .
 docker run \
     --rm \
     --network none \
-    --read-only \
     --mount type=bind,src="${solution_dir}",dst=/solution \
     --mount type=bind,src="${output_dir}",dst=/output \
     --mount type=tmpfs,dst=/tmp \