diff --git a/Dockerfile b/Dockerfile
index 41dd764..4838ea9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,12 @@
-FROM heroku/heroku:18-build
+FROM heroku/heroku:20-build
 
 # Which versions?
 ENV RUBY_MAJOR_VERSION 2.7.0
-ENV RUBY_VERSION 2.7.1
+ENV RUBY_VERSION 2.7.2
 # https://devcenter.heroku.com/articles/ruby-support#libraries
 ENV BUNDLER_VERSION 2.0.2
-ENV NODE_VERSION 14.2.0
-ENV YARN_VERSION 1.22.4
+ENV NODE_VERSION 14.15.1
+ENV YARN_VERSION 1.22.10
 
 ENV LC_ALL en_US.UTF-8
 
diff --git a/README.md b/README.md
index d17c88b..cee4fa4 100644
--- a/README.md
+++ b/README.md
@@ -4,10 +4,10 @@ Usage: `FROM nerdsandcompany/docker-heroku-rails`
 
 # Specifications
 
-* Heroku 18
-* Ruby 2.7.1
+* Heroku 20
+* Ruby 2.7.2
 * Bundler 2.0.2
-* Node 14.2.0
-* Yarn 1.22.4
+* Node 14.15.1
+* Yarn 1.22.10
 * Chrome
 * ChromeDriver