diff --git a/linux/preview/Ubuntu/Dockerfile b/linux/preview/Ubuntu/Dockerfile
index 6f117629..2221c703 100644
--- a/linux/preview/Ubuntu/Dockerfile
+++ b/linux/preview/Ubuntu/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
 
 # Default SQL Server TCP/Port.
 EXPOSE 1433