diff --git a/.github/workflows/formats.yml b/.github/workflows/formats.yml
index 5440721..d858f6a 100644
--- a/.github/workflows/formats.yml
+++ b/.github/workflows/formats.yml
@@ -18,7 +18,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Cache dependencies
         uses: actions/cache@v4
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d514d65..a434b17 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -24,7 +24,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Cache dependencies
         uses: actions/cache@v4
diff --git a/README.md b/README.md
index 8434328..3d6e4d3 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ Finally, you may use the `openai` service to access the OpenAI API:
 
 ```php
 $result = $container->get('openai')->completions()->create([
-    'model' => 'gpt-3.5-turbo-instruct',
+    'model' => 'gpt-4o-mini',
     'prompt' => 'PHP is',
 ]);
 
diff --git a/composer.json b/composer.json
index a4839d0..2cb1e96 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "require": {
         "php": "^8.2.0",
         "nyholm/psr7": "^1.8.2",
-        "openai-php/client": "^0.12.0",
+        "openai-php/client": "^0.15.0",
         "psr/http-client": "^1.0.3",
         "psr/http-factory": "^1.1.0",
         "symfony/config": "^5.4|^6.3|^7.1.1",