diff --git a/app/Dockerfile b/app/Dockerfile
index f5f1f79..667f313 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -1,6 +1,6 @@
-ARG BASE=ruby:2.6.0
+ARG BASE=ruby:2.6.6
 
-FROM ruby:2.6.0 as base
+FROM ruby:2.6.6 as base
 
 RUN bundle config --global frozen 1
 RUN bundle config set without "development test"