diff --git a/Dockerfile b/Dockerfile
index 284ba1c..4502602 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,10 +2,10 @@ FROM heroku/heroku:18-build
 
 # Which versions?
 ENV RUBY_MAJOR_VERSION 2.6.0
-ENV RUBY_VERSION 2.6.2
+ENV RUBY_VERSION 2.6.3
 ENV BUNDLER_VERSION 2.0.1
-ENV NODE_VERSION 10.14.1
-ENV YARN_VERSION 1.12.3
+ENV NODE_VERSION 12.3.1
+ENV YARN_VERSION 1.16.0
 
 ENV LC_ALL en_US.UTF-8
 
diff --git a/README.md b/README.md
index 116587b..94f273b 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,8 @@ Usage: `FROM nerdsandcompany/docker-heroku-rails`
 # Specifications
 
 * Heroku 18
-* Ruby 2.6.x
-* Bundler
-* Node 10.x
+* Ruby 2.6.3
+* Bundler 2.0.1
+* Node 12.3.1
 * Chrome
 * ChromeDriver