diff --git a/.drone.yml b/.drone.yml
index 7362146..30cce81 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -3,7 +3,7 @@ name: default
 
 steps:
   - name: build
-    image: ruby
+    image: ruby:2.6.5
     commands:
       - gem install bundler
       - bundle install