diff --git a/.travis.yml b/.travis.yml
index 8110adc8..d028aa13 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ env:
 before_script:
   - git clone git://github.com/zenovich/runkit.git && cd runkit && phpize && ./configure && make && make install && cd ..
   - echo "extension=runkit.so" >> `php --ini | grep "Loaded Configuration" | sed -e "s|.*:\s*||"`
-  - composer install --dev --no-interaction
+  - sh -c "if [ '$TRAVIS_PHP_VERSION' = '5.5' ]; then composer install --dev --no-interaction; fi"
 
 script:
   - sh -c "if [ '$TRAVIS_PHP_VERSION' = '5.5' ]; then vendor/bin/phpcs -s --extensions=php --standard=tests/code_sniffer_ruleset.xml phpseclib/; fi"