diff --git a/.travis.yml b/.travis.yml
index 4a368c0..d2f3d82 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
-sudo: false
 language: node_js
+cache: npm
 
 node_js:
   - "0.8"
@@ -16,6 +16,7 @@ node_js:
   - "12"
   - "13"
   - "14"
+  - "15"
 
 before_install:
   - '[ "${TRAVIS_NODE_VERSION}" != "0.8" ] || npm install -g npm@~1.4.0'