diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index b87aa1b..fc70e93 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -19,12 +19,18 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.4"
+          coverage: none
+
       - name: Validate composer.json and composer.lock
         run: composer validate --strict
 
       - name: Cache Composer packages
         id: composer-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: vendor
           key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
diff --git a/.gitignore b/.gitignore
index e3b0e6e..2420f4d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,7 @@
 
 # Composer lock file
 composer.lock
+
+# PHPUnit
+.phpunit.result.cache
+.phpunit.cache/
diff --git a/.mise.toml b/.mise.toml
new file mode 100644
index 0000000..fe1b579
--- /dev/null
+++ b/.mise.toml
@@ -0,0 +1,2 @@
+[tools]
+php = "8.5.6"
diff --git a/.phpunit.result.cache b/.phpunit.result.cache
deleted file mode 100644
index c43b901..0000000
--- a/.phpunit.result.cache
+++ /dev/null
@@ -1 +0,0 @@
-{"version":1,"defects":{"Kickplan\\KickplanSDK\\Tests\\AccountsTest::testPost":4,"Kickplan\\KickplanSdk\\Tests\\AccountsTest::testCreate":4,"Kickplan\\KickplanSdk\\Tests\\AccountsTest::testUpdate":4,"Kickplan\\KickplanSDK\\Tests\\FeaturesTest::testResolve":4,"Kickplan\\KickplanSDK\\Tests\\FeaturesTest::testResolveWithAccount":4,"Kickplan\\KickplanSDK\\Tests\\FeaturesTest::testResolveFeatureForAccount":4,"Kickplan\\KickplanSDK\\Tests\\MetricsTest::testPost":4,"Kickplan\\KickplanSdk\\Tests\\FeaturesTest::testResolve":4,"Kickplan\\KickplanSdk\\Tests\\FeaturesTest::testResolveWithAccount":4,"Kickplan\\KickplanSdk\\Tests\\FeaturesTest::testResolveFeatureForAccount":4,"Kickplan\\KickplanSdk\\Tests\\MetricsTest::testPost":4,"Kickplan\\Tests\\AccountsTest::testCreate":4,"Kickplan\\Tests\\AccountsTest::testUpdate":4,"Kickplan\\Tests\\FeaturesTest::testResolve":4,"Kickplan\\Tests\\FeaturesTest::testResolveWithAccount":4,"Kickplan\\Tests\\FeaturesTest::testResolveFeatureForAccount":4,"Kickplan\\Tests\\MetricsTest::testPost":4},"times":{"Kickplan\\KickplanSDK\\Tests\\AccountsTest::testPost":5.133,"Kickplan\\KickplanSDK\\Tests\\FeaturesTest::testResolve":0,"Kickplan\\KickplanSDK\\Tests\\FeaturesTest::testResolveWithAccount":0,"Kickplan\\KickplanSDK\\Tests\\FeaturesTest::testResolveFeatureForAccount":0,"Kickplan\\KickplanSDK\\Tests\\MetricsTest::testPost":0,"Kickplan\\KickplanSdk\\Tests\\AccountsTest::testCreate":0.004,"Kickplan\\KickplanSdk\\Tests\\AccountsTest::testUpdate":0,"Kickplan\\KickplanSdk\\Tests\\FeaturesTest::testResolve":0,"Kickplan\\KickplanSdk\\Tests\\FeaturesTest::testResolveWithAccount":0,"Kickplan\\KickplanSdk\\Tests\\FeaturesTest::testResolveFeatureForAccount":0,"Kickplan\\KickplanSdk\\Tests\\MetricsTest::testPost":0,"Kickplan\\Tests\\AccountsTest::testCreate":0.343,"Kickplan\\Tests\\AccountsTest::testUpdate":0.383,"Kickplan\\Tests\\FeaturesTest::testResolve":0.07,"Kickplan\\Tests\\FeaturesTest::testResolveWithAccount":0.068,"Kickplan\\Tests\\FeaturesTest::testResolveFeatureForAccount":0.07,"Kickplan\\Tests\\MetricsTest::testPost":0.072}}
\ No newline at end of file
diff --git a/composer.json b/composer.json
index d3c0248..2607012 100644
--- a/composer.json
+++ b/composer.json
@@ -5,12 +5,12 @@
   "minimum-stability": "stable",
   "license": "MIT",
   "require": {
-    "php": ">=7.4",
+    "php": ">=8.2",
     "guzzlehttp/guzzle": "^7.9",
     "ramsey/uuid": "^4.7"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9.0"
+    "phpunit/phpunit": "^11.0"
   },
   "autoload": {
     "psr-4": {