diff --git a/.travis.yml b/.travis.yml
index 5be69ca..28d0d11 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,4 @@
 language: ruby
 rvm:
   - 2.4
-  - 2.1
-  - 1.9.3
+  - 2.3