diff --git a/centos/Dockerfile b/centos/Dockerfile
index f434d97..065eab8 100644
--- a/centos/Dockerfile
+++ b/centos/Dockerfile
@@ -11,6 +11,7 @@ ARG OVERRIDE=override
 ADD $OVERRIDE /
 
 RUN set -x \
+    && yum upgrade -y \
     && yum install -y git \
         httpd \
         mod_ssl \
diff --git a/debian/Dockerfile b/debian/Dockerfile
index de394d7..af9763d 100644
--- a/debian/Dockerfile
+++ b/debian/Dockerfile
@@ -12,6 +12,7 @@ ADD $OVERRIDE /
 
 RUN set -x \
     && apt-get update \
+    && apt-get dist-upgrade -y \
     && apt-get install -y --no-install-recommends git \
         apache2 \
         libapache2-mod-wsgi \
diff --git a/ubuntu/Dockerfile b/ubuntu/Dockerfile
index 20f7a84..4580439 100644
--- a/ubuntu/Dockerfile
+++ b/ubuntu/Dockerfile
@@ -12,6 +12,7 @@ ADD $OVERRIDE /
 
 RUN set -x \
     && apt-get update \
+    && apt-get dist-upgrade -y \
     && apt-get install -y --no-install-recommends git \
         apache2 \
         libapache2-mod-wsgi \