diff --git a/.travis.yml b/.travis.yml
index d3401910..016ff71e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ dist: trusty
 
 language: ruby
 rvm:
-    - 2.2.3
+    - 2.3.0
 
 cache:
   bundler: true
@@ -22,7 +22,7 @@ addons:
         - libgsl0-dev
 
 before_install:
-    - nvm install 5
+    - nvm install 6
 
 before_script: "_ci/setup.sh"
 script: "_ci/build.sh"