diff --git a/.trustie-pipeline.yml b/.trustie-pipeline.yml
index 97919f8a6..de4a3c8a6 100644
--- a/.trustie-pipeline.yml
+++ b/.trustie-pipeline.yml
@@ -8,7 +8,7 @@ platform:
 
 steps:
 - name: test
-  image: ruby
+  image: ruby:2.3.7
   commands:
   - bundle install --jobs=3 --retry=3
   - rake