diff --git a/src/Jobs/BaseJob.php b/src/Jobs/BaseJob.php
index 1b4607a..661489d 100644
--- a/src/Jobs/BaseJob.php
+++ b/src/Jobs/BaseJob.php
@@ -539,22 +539,23 @@ public function __toString()
         return sprintf('%s %s', get_class($this), $this->description);
     }
 
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->data[$offset]);
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetGet($offset)
     {
         return $this->data[$offset];
     }
 
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         $this->data[$offset] = $value;
     }
 
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->data[$offset]);
     }
diff --git a/src/Jobs/Collection.php b/src/Jobs/Collection.php
index da1a5e2..9739523 100644
--- a/src/Jobs/Collection.php
+++ b/src/Jobs/Collection.php
@@ -177,7 +177,7 @@ public function fromWorker(string $worker, string $subTimeInterval = ''): array
      * @param  string $jid
      * @return bool
      */
-    public function offsetExists($jid)
+    public function offsetExists($jid): bool
     {
         return $this->client->get($jid) !== null;
     }
@@ -190,6 +190,7 @@ public function offsetExists($jid)
      *
      * @throws QlessException
      */
+    #[\ReturnTypeWillChange]
     public function offsetGet($jid)
     {
         $data = $this->client->get($jid);
@@ -215,7 +216,7 @@ public function offsetGet($jid)
      *
      * @throws UnsupportedFeatureException
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         throw new UnsupportedFeatureException('Setting a job is not supported using Jobs collection.');
     }
@@ -225,7 +226,7 @@ public function offsetSet($offset, $value)
      *
      * @throws UnsupportedFeatureException
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         throw new UnsupportedFeatureException('Deleting a job is not supported using Jobs collection.');
     }
diff --git a/src/Jobs/JobData.php b/src/Jobs/JobData.php
index c84cbf7..f1bf01a 100644
--- a/src/Jobs/JobData.php
+++ b/src/Jobs/JobData.php
@@ -17,7 +17,7 @@ final class JobData extends ArrayObject implements JsonSerializable
      *
      * @return array
      */
-    public function jsonSerialize()
+    public function jsonSerialize(): array
     {
         return $this->toArray();
     }
@@ -25,9 +25,9 @@ public function jsonSerialize()
     /**
      * Creates a copy of the ArrayObject (alias for \ArrayObject::getArrayCopy).
      *
-     * @see \ArrayObject::getArrayCopy
-     *
      * @return array
+     * @see ArrayObject::getArrayCopy
+     *
      */
     public function toArray(): array
     {
diff --git a/src/Queues/Collection.php b/src/Queues/Collection.php
index 5d1b5d9..5894176 100644
--- a/src/Queues/Collection.php
+++ b/src/Queues/Collection.php
@@ -100,7 +100,7 @@ public function fromSubscriptions(string $topic): array
      * @param  mixed $offset
      * @return bool
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         $queues = json_decode($this->client->queues(), true) ?: [];
 
@@ -119,7 +119,7 @@ public function offsetExists($offset)
      * @param  string $offset
      * @return Queue
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): Queue
     {
         return new Queue($offset, $this->client);
     }
@@ -129,7 +129,7 @@ public function offsetGet($offset)
      *
      * @throws UnsupportedFeatureException
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         throw new UnsupportedFeatureException('Setting a queue is not supported using Queues collection.');
     }
@@ -139,7 +139,7 @@ public function offsetSet($offset, $value)
      *
      * @throws QlessException If the queue is not empty.
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         $this[$offset]->forget();
     }
diff --git a/src/Workers/Collection.php b/src/Workers/Collection.php
index 8c65ee6..3b9bf8c 100644
--- a/src/Workers/Collection.php
+++ b/src/Workers/Collection.php
@@ -72,7 +72,7 @@ public function getRange(int $start, int $last): array
      * @param  mixed $offset
      * @return bool
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         $workers = json_decode($this->client->workers(), true) ?: [];
 
@@ -91,7 +91,7 @@ public function offsetExists($offset)
      * @param  string $offset
      * @return array
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): array
     {
         $worker = json_decode($this->client->workers($offset), true) ?: [];
 
@@ -107,7 +107,7 @@ public function offsetGet($offset)
      *
      * @throws UnsupportedFeatureException
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         throw new UnsupportedFeatureException('Setting a worker is not supported using Workers collection.');
     }
@@ -117,7 +117,7 @@ public function offsetSet($offset, $value)
      *
      * @throws UnsupportedFeatureException
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         throw new UnsupportedFeatureException('Deleting a worker is not supported using Workers collection.');
     }