diff --git a/linux/preview/examples/mssql-cli/Dockerfile b/linux/preview/examples/mssql-cli/Dockerfile
index b22b0841..17edf4ec 100644
--- a/linux/preview/examples/mssql-cli/Dockerfile
+++ b/linux/preview/examples/mssql-cli/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:16.04
+FROM ubuntu:xenial-20210114
 
 # apt-get update and install required utilities
 RUN apt-get update && apt-get install -y \