diff --git a/src/SecurityScheme/SecuritySettings/DefaultSecuritySettings.php b/src/SecurityScheme/SecuritySettings/DefaultSecuritySettings.php
index 6d1bcf7c..a085ccf0 100644
--- a/src/SecurityScheme/SecuritySettings/DefaultSecuritySettings.php
+++ b/src/SecurityScheme/SecuritySettings/DefaultSecuritySettings.php
@@ -70,7 +70,7 @@ public function offsetSet($offset, $value): void
      *
      * @return bool
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->settings[$offset]);
     }
@@ -88,7 +88,7 @@ public function offsetUnset($offset): void
      * Get a single settings value
      * @link http://php.net/manual/en/arrayaccess.offsetget.php
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return $this->settings[$offset] ?? null;
     }
diff --git a/src/TraitCollection.php b/src/TraitCollection.php
index d59d159a..a83b6a5d 100644
--- a/src/TraitCollection.php
+++ b/src/TraitCollection.php
@@ -55,10 +55,7 @@ public static function getInstance()
         return self::$instance;
     }
 
-    /**
-     * @return TraitDefinition
-     */
-    public function current()
+    public function current(): TraitDefinition
     {
         if ($this->valid()) {
             return $this->collection[$this->position];
@@ -67,10 +64,7 @@ public function current()
         throw new InvalidKeyException($this->position);
     }
 
-    /**
-     * @return int
-     */
-    public function key()
+    public function key(): int
     {
         return $this->position;
     }
@@ -85,10 +79,7 @@ public function rewind(): void
         $this->position = 0;
     }
 
-    /**
-     * @return bool
-     */
-    public function valid()
+    public function valid(): bool
     {
         return isset($this->collection[$this->position]);
     }
diff --git a/src/TypeCollection.php b/src/TypeCollection.php
index 344495da..88b25886 100644
--- a/src/TypeCollection.php
+++ b/src/TypeCollection.php
@@ -52,7 +52,7 @@ public static function getInstance()
     /**
      * {@inheritDoc}
      */
-    public function current()
+    public function current(): mixed
     {
         return $this->collection[$this->position];
     }
@@ -60,7 +60,7 @@ public function current()
     /**
      * {@inheritDoc}
      */
-    public function key()
+    public function key(): mixed
     {
         return $this->position;
     }
@@ -84,7 +84,7 @@ public function rewind(): void
     /**
      * {@inheritDoc}
      */
-    public function valid()
+    public function valid(): bool
     {
         return isset($this->collection[$this->position]);
     }