diff --git a/.travis.yml b/.travis.yml
index 5ccbb62..4c4550d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,10 +8,16 @@ matrix:
       elixir: 1.3.2
     - otp_release: 19.0
       elixir: 1.3.2
+    - otp_release: 20.3
+      elixir: 1.5
+    - otp_release: 20.3
+      elixir: 1.6
       env: STATIX_TEST_RUNTIME_CONFIG=false
-    - otp_release: 19.0
-      elixir: 1.3.2
+    - otp_release: 20.3
+      elixir: 1.6
       env: STATIX_TEST_RUNTIME_CONFIG=true
+    - otp_release: 21.0
+      elixir: 1.6
 
 sudo: false