diff --git a/composer.json b/composer.json
index 32511ec735cebbeda69514cd047c3bc813da300d..96eb960ce594bfc6ea90c780fafd04230a691eeb 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
   },
   "require-dev": {
     "mikey179/vfsstream": "^1.6",
-    "phpunit/phpunit": "^8.5"
+    "phpunit/phpunit": "^7.0"
   },
   "autoload": {
     "psr-4": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 882f36c66ad4d3d434a10216577d6ebe4705c282..ba74a11535c5aa1be2bcea113487ac90f9382149 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/8.5/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/7.5/phpunit.xsd"
          bootstrap="vendor/autoload.php"
          executionOrder="depends,defects"
          forceCoversAnnotation="true"