diff --git a/.travis.yml b/.travis.yml
index eeaa7e9a755..3e8cb903cfb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -123,18 +123,19 @@ install:
                         jakub-onderka/php-console-highlighter ^0 \
                         squizlabs/php_codesniffer ^3
   fi
-  if [ "$TRAVIS_PHP_VERSION" = '5.6' ] || [ "$TRAVIS_PHP_VERSION" = '7.0' ] || [ "$TRAVIS_PHP_VERSION" = '7.1' ]; then
-    composer -n require phpunit/phpunit ^5 \
-                        jakub-onderka/php-parallel-lint ^0 \
-                        jakub-onderka/php-console-highlighter ^0 \
-                        squizlabs/php_codesniffer ^3
-  fi
-  if [ "$TRAVIS_PHP_VERSION" = '7.2' ] || [ "$TRAVIS_PHP_VERSION" = '7.3' ] || [ "$TRAVIS_PHP_VERSION" = 'nightly' ]; then
+  if [ "$TRAVIS_PHP_VERSION" = '5.6' ] || [ "$TRAVIS_PHP_VERSION" = '7.0' ] || [ "$TRAVIS_PHP_VERSION" = '7.1' ] \
+     [ "$TRAVIS_PHP_VERSION" = '7.2' ] || [ "$TRAVIS_PHP_VERSION" = '7.3' ]; then
     composer -n require phpunit/phpunit ^5 \
                         jakub-onderka/php-parallel-lint ^0 \
                         jakub-onderka/php-console-highlighter ^0 \
                         squizlabs/php_codesniffer ^3
   fi
+  if [ "$TRAVIS_PHP_VERSION" = 'nightly' ]; then
+      composer -n require --ignore-platform-reqs phpunit/phpunit ^5 \
+                                                 jakub-onderka/php-parallel-lint ^0 \
+                                                 jakub-onderka/php-console-highlighter ^0 \
+                                                 squizlabs/php_codesniffer ^3
+    fi
   echo
 
 - |