diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 128dc7d..a916ae4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,7 +13,7 @@ jobs:
         php-versions: ["7.4", "8.0", "8.1", "8.2"]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Setup PHP, with composer and extensions
       uses: shivammathur/setup-php@v2
diff --git a/src/Cache/AbstractCache.php b/src/Cache/AbstractCache.php
index 5045709..0db74cb 100644
--- a/src/Cache/AbstractCache.php
+++ b/src/Cache/AbstractCache.php
@@ -114,7 +114,7 @@ protected function doDeleteMultiple($keys): bool
      * @throws InvalidArgumentException MUST be thrown if the $key string is
      * not a legal value.
      */
-    protected function doGet(string $key, $defaultValue = null)
+    protected function doGet(string $key, $defaultValue = null): mixed
     {
     }
 
@@ -123,8 +123,9 @@ protected function doGet(string $key, $defaultValue = null)
      *
      * @param mixed $keys
      * @param mixed $defaultValue
+     * @return array
      */
-    protected function doGetMultiple($keys, $defaultValue = null)
+    protected function doGetMultiple($keys, $defaultValue = null): array
     {
     }
 
diff --git a/src/Cli/Router.php b/src/Cli/Router.php
index a925d49..1b27cc8 100644
--- a/src/Cli/Router.php
+++ b/src/Cli/Router.php
@@ -227,8 +227,9 @@ public function handle($arguments = null)
      * Sets the default action name
      *
      * @param string $actionName
+     * @return Router
      */
-    public function setDefaultAction(string $actionName)
+    public function setDefaultAction(string $actionName): Router
     {
     }
 
@@ -236,8 +237,9 @@ public function setDefaultAction(string $actionName)
      * Sets the name of the default module
      *
      * @param string $moduleName
+     * @return Router
      */
-    public function setDefaultModule(string $moduleName)
+    public function setDefaultModule(string $moduleName): Router
     {
     }
 
diff --git a/src/Filter/Validation.php b/src/Filter/Validation.php
index 5e1f2c7..d867935 100644
--- a/src/Filter/Validation.php
+++ b/src/Filter/Validation.php
@@ -265,9 +265,9 @@ public function setValidators(array $validators): Validation
      *
      * @param array|object $data
      * @param object $entity
-     * @return Messages
+     * @return Messages|false
      */
-    public function validate($data = null, $entity = null): Messages
+    public function validate($data = null, $entity = null): Messages|bool
     {
     }
 
diff --git a/src/Filter/Validation/ValidationInterface.php b/src/Filter/Validation/ValidationInterface.php
index 9e1229b..2b16c26 100644
--- a/src/Filter/Validation/ValidationInterface.php
+++ b/src/Filter/Validation/ValidationInterface.php
@@ -130,7 +130,7 @@ public function setLabels(array $labels): void;
      *
      * @param array|object $data
      * @param object $entity
-     * @return Messages
+     * @return Messages|false
      */
-    public function validate($data = null, $entity = null): Messages;
+    public function validate($data = null, $entity = null): Messages|bool;
 }