diff --git a/.travis.yml b/.travis.yml
index 8c68714..6655bc5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ node_js:
   - "2.5"
   - "3.3"
   - "4.2"
+  - "5.3"
 sudo: false
 before_install:
   # Setup Node.js version-specific dependencies
diff --git a/appveyor.yml b/appveyor.yml
index 01f8486..e905d51 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,6 +7,7 @@ environment:
     - nodejs_version: "2.5"
     - nodejs_version: "3.3"
     - nodejs_version: "4.2"
+    - nodejs_version: "5.3"
 install:
   - ps: Install-Product node $env:nodejs_version
   - if "%nodejs_version%" equ "0.8" npm rm --save-dev istanbul