diff --git a/guest/kernel/default/Dockerfile b/guest/kernel/default/Dockerfile
index 72e20de..9a3f72d 100644
--- a/guest/kernel/default/Dockerfile
+++ b/guest/kernel/default/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:18.10
+FROM ubuntu:cosmic-20190719
 
 RUN apt-get update               \
  && apt-get -y -q install        \
diff --git a/guest/rootfs/ubuntu/Dockerfile b/guest/rootfs/ubuntu/Dockerfile
index 6718da6..911b566 100644
--- a/guest/rootfs/ubuntu/Dockerfile
+++ b/guest/rootfs/ubuntu/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:18.10
+FROM ubuntu:cosmic-20190719
 
 # Install system dependencies
 RUN apt-get update -y