diff --git a/Dockerfile b/Dockerfile
index 47e9bb0..e2815df 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,4 +11,4 @@ ADD index.html.erb ./
 ADD saca-sapos ./
 
 EXPOSE 4567
-CMD ["bundle", "exec", "ruby", "main.rb"]
+CMD ["puma", "-p", "4567"]
diff --git a/config.ru b/config.ru
new file mode 100644
index 0000000..8e8dd59
--- /dev/null
+++ b/config.ru
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+# SPDX-FileCopyrightText: 2022 Hugo Peixoto <hugo.peixoto@gmail.com>
+
+require './main'
+run Sinatra::Application