diff --git a/Dockerfile b/Dockerfile
index cef1ecf56a76c1b154fd36b3abaa54b685516811..ae41b35fb1ce9344b56c427549e6c1cc94a9f1b3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,12 @@ FROM debian:bullseye
 
 HEALTHCHECK --interval=10s --timeout=15s --retries=12 --start-period=3m CMD ["/usr/bin/curl", "-k", "-I", "https://127.0.0.1:8140"]
 
-RUN apt-get update -qq && apt install -y git puppet-master curl augeas-tools
+RUN apt-get update -qq && apt install -y \
+	augeas-tools \
+	curl \
+	git \
+	puppet-master \
+	ruby-scanf
 RUN puppet config set autosign "true" --section master
 
 COPY entrypoint.sh /