diff --git a/linux/preview/examples/mssql-agent-fts-ha-tools/Dockerfile b/linux/preview/examples/mssql-agent-fts-ha-tools/Dockerfile
index 7400a725..5f1ab2ce 100644
--- a/linux/preview/examples/mssql-agent-fts-ha-tools/Dockerfile
+++ b/linux/preview/examples/mssql-agent-fts-ha-tools/Dockerfile
@@ -3,7 +3,7 @@
 # GitRepo: https://github.com/Microsoft/mssql-docker
 
 # Base OS layer: Latest Ubuntu LTS
-FROM ubuntu:16.04
+FROM ubuntu:xenial-20210416
 
 # Install prerequistes since it is needed to get repo config for SQL server
 RUN export DEBIAN_FRONTEND=noninteractive && \