diff --git a/Jenkinsfile b/Jenkinsfile
index 3d09683..1542c9e 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1,6 +1,6 @@
 #!/usr/bin/env groovy
 
-def rubies = ['2.3.0', '2.3.1', '2.2.5', 'jruby', 'jruby-9.1.2.0', 'rubinius']
+def rubies = ['2.3.0', '2.3.1', '2.2.5', '2.1.10', 'jruby', 'jruby-9.1.2.0', 'rubinius', 'ree']
 
 node('docker') {
     checkout scm