diff --git a/.travis.yml b/.travis.yml
index 176c29e..b5da12e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,8 @@
 language: elixir
 notifications:
-  recipients:
-    - eduardo@gurgel.me
+  email:
+    recipients:
+      - eduardo@gurgel.me
 cache:
   directories:
     - _build
@@ -10,16 +11,19 @@ sudo: false
 script: mix test
 matrix:
   include:
-      otp_release: 21.0
-    - elixir: 1.7
-      otp_release: 19.3
-    - elixir: 1.7
-      otp_release: 20.3
-    - elixir: 1.7
-      otp_release: 21.0
-    - elixir: 1.8
-      otp_release: 20.3
-    - elixir: 1.8
-      otp_release: 21.0
-    - elixir: 1.8
-      otp_release: 22.0.1
+    - elixir: '1.7'
+      otp_release: '19.3'
+    - elixir: '1.7'
+      otp_release: '20.3'
+    - elixir: '1.7'
+      otp_release: '21.0'
+    - elixir: '1.8'
+      otp_release: '20.3'
+    - elixir: '1.8'
+      otp_release: '21.0'
+    - elixir: '1.8'
+      otp_release: '22.0.1'
+    - elixir: '1.15.8'
+      otp_release: '25.3.2.12'
+    - elixir: '1.16.3'
+      otp_release: '26.2.5'