diff --git a/Dockerfile b/Dockerfile
index c6138314..77fc89cf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -43,6 +43,7 @@ ARG UID=991
 ARG GID=991
 
 RUN apk add --no-cache \
+  'curl>=8' \
   'gcompat>=0' \
   'tzdata>=2024' \
   'libxml2>=2' \
diff --git a/Rakefile b/Rakefile
index 4b86d6bd..95c56a08 100644
--- a/Rakefile
+++ b/Rakefile
@@ -58,7 +58,7 @@ task :test do
   sh 'curl -f http://127.0.0.1:3000/example.rss || exit 1'
 
   Output.describe 'Authenticated request to GET /health_check.txt'
-  sh 'curl -f http://username:password@127.0.0.1:3000/health_check.txt || exit 1'
+  sh 'docker exec html2rss-web-test curl -f http://username:password@127.0.0.1:3000/health_check.txt || exit 1'
 
   Output.describe 'Print output of `html2rss help`'
   sh 'docker exec html2rss-web-test html2rss help'
@@ -72,4 +72,6 @@ ensure
     sh 'docker stop html2rss-web-test'
     sh 'docker rm html2rss-web-test'
   end
+
+  exit 1 if $ERROR_INFO
 end