diff --git a/.travis.yml b/.travis.yml
index ab95a88..eea30a2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,8 @@
 language: rust
 rust:
-  - 1.31
+  - 1.31.0
 
+cache: cargo
 
 script:
   - cargo test --verbose --release --all