diff --git a/app.yaml b/app.yaml
index af5cf2c..e863d1e 100644
--- a/app.yaml
+++ b/app.yaml
@@ -1,3 +1,3 @@
-runtime: ruby25
+runtime: ruby27
 service: randomquotes-ruby
 entrypoint: bundle exec unicorn -c unicorn.rb
\ No newline at end of file