diff --git a/Dockerfile b/Dockerfile
index 5d5436be..dc130ceb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,6 +23,8 @@ RUN dnf install -y tar \
     python-devel \
     zlib-devel \
     libjpeg-devel \
+    redhat-rpm-config \
+    patch \
   && dnf clean packages \
   && (curl -s -k -L -C - -b "oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u20-b26/jdk-8u20-linux-x64.tar.gz | tar xfz -) \
   && mkdir /fopub \
@@ -32,7 +34,7 @@ RUN dnf install -y tar \
   && rm empty.xml \
   && gem install --no-ri --no-rdoc asciidoctor --version $ASCIIDOCTOR_VERSION \
   && gem install --no-ri --no-rdoc asciidoctor-diagram \
-  && gem install --no-ri --no-rdoc asciidoctor-epub3 --version 1.5.0.alpha.5 \
+  && gem install --no-ri --no-rdoc asciidoctor-epub3 --version 1.5.0.alpha.6 \
   && gem install --no-ri --no-rdoc asciidoctor-pdf --version 1.5.0.alpha.10 \
   && gem install --no-ri --no-rdoc asciidoctor-confluence \
   && gem install --no-ri --no-rdoc coderay pygments.rb thread_safe epubcheck kindlegen \