diff --git a/lib/Drush/Command/DrushInputAdapter.php b/lib/Drush/Command/DrushInputAdapter.php
index 801b58c32..08988e68d 100644
--- a/lib/Drush/Command/DrushInputAdapter.php
+++ b/lib/Drush/Command/DrushInputAdapter.php
@@ -51,7 +51,7 @@ class DrushInputAdapter implements InputInterface
     /**
      *  {@inheritdoc}
      */
-    public function getFirstArgument()
+    public function getFirstArgument(): ?string
     {
         return reset($this->arguments);
     }
@@ -59,7 +59,7 @@ class DrushInputAdapter implements InputInterface
     /**
      * {@inheritdoc}
      */
-    public function hasParameterOption($values, $onlyParams = false)
+    public function hasParameterOption(string|array $values, bool $onlyParams = false): bool
     {
         $values = (array) $values;
 
@@ -75,7 +75,7 @@ class DrushInputAdapter implements InputInterface
     /**
      *  {@inheritdoc}
      */
-    public function getParameterOption($values, $default = false, $onlyParams = false)
+    public function getParameterOption(string|array $values, string|bool|int|float|array|null $default = false, bool $onlyParams = false)
     {
         $values = (array) $values;
 
@@ -107,7 +107,7 @@ class DrushInputAdapter implements InputInterface
     /**
      *  {@inheritdoc}
      */
-    public function getArguments()
+    public function getArguments(): array
     {
         return $this->arguments;
     }
@@ -132,7 +132,7 @@ class DrushInputAdapter implements InputInterface
     /**
      *  {@inheritdoc}
      */
-    public function hasArgument($name)
+    public function hasArgument($name): bool
     {
         return isset($this->arguments[$name]);
     }
@@ -140,7 +140,7 @@ class DrushInputAdapter implements InputInterface
     /**
      *  {@inheritdoc}
      */
-    public function getOptions()
+    public function getOptions(): array
     {
         return $this->options;
     }
@@ -164,7 +164,7 @@ class DrushInputAdapter implements InputInterface
     /**
      *  {@inheritdoc}
      */
-    public function hasOption($name)
+    public function hasOption($name): bool
     {
         return isset($this->options[$name]);
     }
@@ -172,7 +172,7 @@ class DrushInputAdapter implements InputInterface
     /**
      *  {@inheritdoc}
      */
-    public function isInteractive()
+    public function isInteractive(): bool
     {
         return $this->interactive;
     }