diff --git a/.travis.yml b/.travis.yml
index 0bb588c..55aa641 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,3 +10,7 @@ matrix:
       otp_release: 19.1
     - elixir: 1.5.1
       otp_release: 20.0
+    - elixir: 1.6.5
+      otp_release: 20.0
+    - elixir: 1.7.3
+      otp_release: 21.0