diff --git a/Dockerfile b/Dockerfile
index ceee620..452e554 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,6 +4,7 @@ MAINTAINER Christopher A. Mosher <cmosher01@gmail.com>
 
 ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get update && \
+    apt-get upgrade -y && \
     apt-get install --no-install-recommends -y \
         asciidoc \
         automake \