diff --git a/.travis.yml b/.travis.yml
index 4da293c150e..721e5410cbb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -120,12 +120,6 @@ install:
 
 - |
   echo "Installing Composer dependencies - PHP Unit, Parallel Lint, PHP CodeSniffer - for $TRAVIS_PHP_VERSION"
-  if [ "$TRAVIS_PHP_VERSION" = '5.4' ] || [ "$TRAVIS_PHP_VERSION" = '5.5' ]; then
-    composer -n require phpunit/phpunit ^4 \
-                        jakub-onderka/php-parallel-lint ^0 \
-                        jakub-onderka/php-console-highlighter ^0 \
-                        squizlabs/php_codesniffer ^3
-  fi
   if [ "$TRAVIS_PHP_VERSION" = '5.6' ] || [ "$TRAVIS_PHP_VERSION" = '7.0' ] || [ "$TRAVIS_PHP_VERSION" = '7.1' ] \
      [ "$TRAVIS_PHP_VERSION" = '7.2' ] || [ "$TRAVIS_PHP_VERSION" = '7.3' ] || [ "$TRAVIS_PHP_VERSION" = '7.4' ]; then
     composer -n require phpunit/phpunit ^5 \