diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7db5b12..bd3228d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [7.1, 7.2, 7.3, 7.4, 8.0, 8.1]
+        php: [7.1, 7.2, 7.3, 7.4, 8.0]
 
     steps:
       - name: Checkout code
diff --git a/composer.json b/composer.json
index a47641f..a8f1097 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     "php": ">= 7.1"
   },
   "require-dev": {
-    "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.5 || ^8.5 || 9.3",
+    "phpunit/phpunit": "^7.5 || ^8.5 || 9.3",
     "squizlabs/php_codesniffer": "^3.5"
   },
   "autoload": {