diff --git a/php/composer.json b/php/composer.json
index ef223da260f4..28d379bdec35 100644
--- a/php/composer.json
+++ b/php/composer.json
@@ -6,10 +6,10 @@
   "homepage": "https://developers.google.com/protocol-buffers/",
   "license": "BSD-3-Clause",
   "require": {
-    "php": ">=7.3.0"
+    "php": ">=7.0.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9"
+    "phpunit/phpunit": ">=6.0.0"
   },
   "autoload": {
     "psr-4": {