diff --git a/config/puma.rb b/config/puma.rb
index a248513..360a0c6 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -28,7 +28,7 @@ threads_count = ENV.fetch("RAILS_MAX_THREADS", 3)
 threads threads_count, threads_count
 
 # Specifies the `port` that Puma will listen on to receive requests; default is 3000.
-port ENV.fetch("PORT", 3000)
+bind "tcp://0.0.0.0:#{ENV['PORT'] || 3000}"
 
 # Allow puma to be restarted by `bin/rails restart` command.
 plugin :tmp_restart