diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6184613..0d4e7ef 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -20,18 +20,13 @@ jobs:
           - "7.3"
           - "7.4"
           - "8.0"
+          - "8.1"
         dependencies:
           - "locked"
           - "lowest"
           - "highest"
         experimental:
           - false
-        include:
-          - os: "ubuntu-latest"
-            php: "8.1"
-            dependencies: "highest"
-            composer-options: "--ignore-platform-reqs"
-            experimental: true
 
     name: PHP${{ matrix.php }} on ${{ matrix.os }} (${{ matrix.dependencies }})
 
diff --git a/composer.json b/composer.json
index 52648e3..5a5b91d 100644
--- a/composer.json
+++ b/composer.json
@@ -28,10 +28,10 @@
         "php-http/multipart-stream-builder": "^1.0"
     },
     "require-dev": {
-        "mockery/mockery": "~1.3.1 || ^1.4.2",
+        "mockery/mockery": "~1.3.1 || ^1.4.4",
         "php-http/guzzle7-adapter": "^0.1",
         "phpstan/phpstan": "^0.12.90",
-        "phpunit/phpunit": "^8.4 || ^9.3.3 || ^10.0"
+        "phpunit/phpunit": "^8.5.21 || ^9.5.10 || ^10.0"
     },
     "extra": {
         "branch-alias": {