diff --git a/.travis.yml b/.travis.yml
index 8cfdaefd6..61b45a396 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ rust:
   - 1.20.0
   - stable
   - beta
-  - nightly
+  - nightly-2017-12-21
 
 sudo: required
 dist: trusty