diff --git a/build/linux/toolkit.Dockerfile b/build/linux/toolkit.Dockerfile
index 1f7938df3..cccc75c6d 100644
--- a/build/linux/toolkit.Dockerfile
+++ b/build/linux/toolkit.Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu
+FROM ubuntu:groovy-20210416
 
 # Expose port for the Portainer UI and Edge server
 EXPOSE 9000