diff --git a/composer.json b/composer.json
index 7bc5dcb..565746d 100644
--- a/composer.json
+++ b/composer.json
@@ -28,14 +28,14 @@
     },
     "require": {
         "php": "^7.2 || ^8.0",
-        "psr/container": "^1.0",
+        "psr/container": "^1.0 || ^2.0.1",
         "psr/http-message": "^1.0",
         "psr/http-server-middleware": "^1.0",
         "psr/log": "^1.1",
         "twig/twig": "^2.12.0 || ^3.0.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.1"
+        "phpunit/phpunit": "^8.5.16"
     },
     "autoload": {
         "psr-4": {