diff --git a/.travis.yml b/.travis.yml
index d8ad4419..55e07489 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,6 @@ sudo: false
 
 language: php
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6
@@ -11,6 +10,9 @@ php:
   - hhvm
 
 matrix:
+  include:
+    - php: 5.3
+      dist: precise
   allow_failures:
     - php: nightly
     - php: hhvm
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7cb61970..9ad448e7 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,4 +20,4 @@ Klein is an open library designed for a specific purpose. You may find that a ce
  [unit-testing]: README.md#unit-testing
  [psr-2]: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md
  [code-sniffer]: https://github.com/squizlabs/PHP_CodeSniffer
- [php-doc]: http://www.phpdoc.org/docs/latest/for-users/phpdoc-reference.html
+ [php-doc]: https://docs.phpdoc.org/references/phpdoc/index.html