diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5e671bd02..c45918692 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -71,7 +71,7 @@ jobs:
           name: Check code styles
           command: PHP_CS_FIXER_IGNORE_ENV=1 vendor/bin/php-cs-fixer fix -v --dry-run
 
-      # Run tests with phpunit 
+      # Run tests with phpunit
       #
       # If the PR is open by an Algolia, we run all the tests
       # with the keys in the env variables
@@ -110,6 +110,10 @@ jobs:
 workflows:
   workflow:
     jobs:
+      - test:
+          name: 'Guzzle 7 - PHP 8.4'
+          version: "8.4"
+          http_client: guzzlehttp/guzzle:"^7.0"
       - test:
           name: 'Guzzle 7 - PHP 8.1'
           version: "8.1"
diff --git a/src/Cache/FileCacheDriver.php b/src/Cache/FileCacheDriver.php
index 4e4173f1c..c4e1a51bb 100644
--- a/src/Cache/FileCacheDriver.php
+++ b/src/Cache/FileCacheDriver.php
@@ -18,7 +18,7 @@ public function __construct($directory)
     /**
      * {@inheritdoc}
      */
-    public function get($key, $default = null)
+    public function get($key, $default = null): mixed
     {
         if (!$this->has($key)) {
             return $default;
@@ -30,15 +30,15 @@ public function get($key, $default = null)
     /**
      * {@inheritdoc}
      */
-    public function set($key, $value, $ttl = null)
+    public function set($key, $value, $ttl = null): bool
     {
-        return file_put_contents($this->getFilenameFromKey($key), $value);
+        return file_put_contents($this->getFilenameFromKey($key), $value) !== false;
     }
 
     /**
      * {@inheritdoc}
      */
-    public function delete($key)
+    public function delete($key): bool
     {
         return @unlink($this->getFilenameFromKey($key));
     }
@@ -46,7 +46,7 @@ public function delete($key)
     /**
      * {@inheritdoc}
      */
-    public function clear()
+    public function clear(): bool
     {
         $result = true;
         foreach (glob($this->directory.self::PREFIX.'*') as $file) {
@@ -59,7 +59,7 @@ public function clear()
     /**
      * {@inheritdoc}
      */
-    public function getMultiple($keys, $default = null)
+    public function getMultiple($keys, $default = null): iterable
     {
         $result = [];
         foreach ($keys as $key) {
@@ -72,7 +72,7 @@ public function getMultiple($keys, $default = null)
     /**
      * {@inheritdoc}
      */
-    public function setMultiple($values, $ttl = null)
+    public function setMultiple($values, $ttl = null): bool
     {
         $result = true;
         foreach ($values as $key => $value) {
@@ -85,7 +85,7 @@ public function setMultiple($values, $ttl = null)
     /**
      * {@inheritdoc}
      */
-    public function deleteMultiple($keys)
+    public function deleteMultiple($keys): bool
     {
         $result = true;
         foreach ($keys as $key) {
@@ -98,7 +98,7 @@ public function deleteMultiple($keys)
     /**
      * {@inheritdoc}
      */
-    public function has($key)
+    public function has($key): bool
     {
         return file_exists($this->getFilenameFromKey($key));
     }
diff --git a/src/Cache/NullCacheDriver.php b/src/Cache/NullCacheDriver.php
index 0eb1d6d3a..c0ad7ed7a 100644
--- a/src/Cache/NullCacheDriver.php
+++ b/src/Cache/NullCacheDriver.php
@@ -9,7 +9,7 @@ final class NullCacheDriver implements CacheInterface
     /**
      * {@inheritdoc}
      */
-    public function get($key, $default = null)
+    public function get($key, $default = null): mixed
     {
         return $default;
     }
@@ -17,7 +17,7 @@ public function get($key, $default = null)
     /**
      * {@inheritdoc}
      */
-    public function set($key, $value, $ttl = null)
+    public function set($key, $value, $ttl = null): bool
     {
         return true;
     }
@@ -25,7 +25,7 @@ public function set($key, $value, $ttl = null)
     /**
      * {@inheritdoc}
      */
-    public function delete($key)
+    public function delete($key): bool
     {
         return true;
     }
@@ -33,7 +33,7 @@ public function delete($key)
     /**
      * {@inheritdoc}
      */
-    public function clear()
+    public function clear(): bool
     {
         return true;
     }
@@ -41,7 +41,7 @@ public function clear()
     /**
      * {@inheritdoc}
      */
-    public function getMultiple($keys, $default = null)
+    public function getMultiple($keys, $default = null): iterable
     {
         $return = [];
 
@@ -55,7 +55,7 @@ public function getMultiple($keys, $default = null)
     /**
      * {@inheritdoc}
      */
-    public function setMultiple($values, $ttl = null)
+    public function setMultiple($values, $ttl = null): bool
     {
         return true;
     }
@@ -63,7 +63,7 @@ public function setMultiple($values, $ttl = null)
     /**
      * {@inheritdoc}
      */
-    public function deleteMultiple($keys)
+    public function deleteMultiple($keys): bool
     {
         return true;
     }
@@ -71,7 +71,7 @@ public function deleteMultiple($keys)
     /**
      * {@inheritdoc}
      */
-    public function has($key)
+    public function has($key): bool
     {
         return false;
     }