diff --git a/.travis.yml b/.travis.yml
index d628e68..40b7848 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,7 @@
 language: erlang
 otp_release:
+  - 21.3
   - 21.0
   - 20.0
+  - 19.0
+  - 18.0