diff --git a/php/tests/test.sh b/php/tests/test.sh
index 91ea56ec8f5b..7f35c27072be 100755
--- a/php/tests/test.sh
+++ b/php/tests/test.sh
@@ -11,9 +11,8 @@ PHP_VERSION=$(php -r "echo PHP_VERSION;")
 
 # Each version of PHPUnit supports a fairly narrow range of PHP versions.
 case "$PHP_VERSION" in
-  7.0.*|7.1.*|7.2.*)
-    # Oddly older than for 5.6. Not sure the reason.
-    PHPUNIT=phpunit-5.6.0.phar
+  7.1.*|7.2.*)
+    PHPUNIT=phpunit-7.5.0.phar
     ;;
   7.3.*|7.4.*)
     PHPUNIT=phpunit-8.phar