diff --git a/.travis.yml b/.travis.yml
index 2033754..90cb61e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ notifications:
 elixir:
   - 1.5.3
 otp_release:
-  - 18.0
+  - 18.3.4.9
   - 19.0
   - 20.0
 sudo: false