Use nightly, not stable
diff --git a/.travis.yml b/.travis.yml
index 94ec9f3..300a5d6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@
 rust:
   - 1.0.0
   - beta
-  - stable
+  - nightly
 services:
   - docker
 script: