diff --git a/.travis.yml b/.travis.yml
index d951c8a8..fb8b93a0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,8 +13,7 @@ matrix:
           env: FEATURES="--no-default-features"
         - rust: stable
           env: FEATURES="--features compat"
-        - rust: 1.18.0
-          env: BUILD_ONLY=1
+        - rust: 1.21.0
 
 cache:
     apt: true