diff --git a/.travis.yml b/.travis.yml
index 1cca5c5e..c6c685a4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,8 @@ matrix:
       otp_release: 19.3
     - os: linux
       otp_release: 20.0
+    - os: linux
+      otp_release: 21.0
     - os: osx
       language: generic
 before_script: