diff --git a/composer.json b/composer.json
index 0d251ab..96a8241 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "php": ">=7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "7.5.1"
+        "phpunit/phpunit": "7.5.20"
     },
     "autoload": {
         "psr-4": {