diff --git a/90_builder/container/deb_Dockerfile b/90_builder/container/deb_Dockerfile
index 97ab655..7cdb44e 100644
--- a/90_builder/container/deb_Dockerfile
+++ b/90_builder/container/deb_Dockerfile
@@ -5,6 +5,8 @@ RUN apt-get update && apt-get upgrade && apt-get -y install asciidoctor pandoc b
 RUN groupadd --gid 1000 appgroup && \
     useradd --uid 1000 --gid appgroup --shell /bin/bash --create-home appuser
 
+RUN gem install asciidoctor-pdf
+
 WORKDIR /workspace
 
 ADD ./90_builder/templates templates