diff --git a/.travis.yml b/.travis.yml
index e811592f..5c0ce205 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ sudo: false
 rvm:
   - &ruby1 2.3.0
   - &ruby2 2.2.4
-  - &ruby3 2.1.9
+  - &ruby3 2.1.8
   - &ruby4 2.1.10
   - &jruby jruby-9.0.4.0
   - &rhead ruby-head