diff --git a/bin/clear-config-cache.php b/bin/clear-config-cache.php
index bc0cdc9..46aef2d 100644
--- a/bin/clear-config-cache.php
+++ b/bin/clear-config-cache.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Script for clearing the configuration cache.
  *
diff --git a/package-lock.json b/package-lock.json
index 5a7e624..86efb16 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
         "eslint-config-standard": "^17.0",
         "eslint-plugin-import": "^2.27",
         "eslint-plugin-node": "^11.1",
-        "eslint-plugin-promise": "^6.1",
+        "eslint-plugin-promise": "^7.2",
         "eslint-plugin-standard": "^5.0",
         "node-sass": "^8.0",
         "webpack": "^5.77",
@@ -1759,15 +1759,22 @@
       }
     },
     "node_modules/eslint-plugin-promise": {
-      "version": "6.1.1",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-promise/-/eslint-plugin-promise-6.1.1.tgz",
-      "integrity": "sha512-tjqWDwVZQo7UIPMeDReOpUgHCmCiH+ePnVT+5zVapL0uuHnegBUs2smM13CzOs2Xb5+MHMRFTs9v24yjba4Oig==",
+      "version": "7.2.1",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-promise/-/eslint-plugin-promise-7.2.1.tgz",
+      "integrity": "sha512-SWKjd+EuvWkYaS+uN2csvj0KoP43YTu7+phKQ5v+xw6+A0gutVX2yqCeCkC3uLCJFiPfR2dD8Es5L7yUsmvEaA==",
       "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "@eslint-community/eslint-utils": "^4.4.0"
+      },
       "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
       },
       "peerDependencies": {
-        "eslint": "^7.0.0 || ^8.0.0"
+        "eslint": "^7.0.0 || ^8.0.0 || ^9.0.0"
       }
     },
     "node_modules/eslint-plugin-standard": {
@@ -6601,11 +6608,13 @@
       }
     },
     "eslint-plugin-promise": {
-      "version": "6.1.1",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-promise/-/eslint-plugin-promise-6.1.1.tgz",
-      "integrity": "sha512-tjqWDwVZQo7UIPMeDReOpUgHCmCiH+ePnVT+5zVapL0uuHnegBUs2smM13CzOs2Xb5+MHMRFTs9v24yjba4Oig==",
+      "version": "7.2.1",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-promise/-/eslint-plugin-promise-7.2.1.tgz",
+      "integrity": "sha512-SWKjd+EuvWkYaS+uN2csvj0KoP43YTu7+phKQ5v+xw6+A0gutVX2yqCeCkC3uLCJFiPfR2dD8Es5L7yUsmvEaA==",
       "dev": true,
-      "requires": {}
+      "requires": {
+        "@eslint-community/eslint-utils": "^4.4.0"
+      }
     },
     "eslint-plugin-standard": {
       "version": "5.0.0",
diff --git a/package.json b/package.json
index 105c1a9..f532b6d 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
     "eslint-config-standard": "^17.0",
     "eslint-plugin-import": "^2.27",
     "eslint-plugin-node": "^11.1",
-    "eslint-plugin-promise": "^6.1",
+    "eslint-plugin-promise": "^7.2",
     "eslint-plugin-standard": "^5.0",
     "node-sass": "^8.0",
     "webpack": "^5.77",
diff --git a/src/App/Handler/ClassHandler.php b/src/App/Handler/ClassHandler.php
index eda74fe..77b2098 100644
--- a/src/App/Handler/ClassHandler.php
+++ b/src/App/Handler/ClassHandler.php
@@ -24,7 +24,7 @@ class ClassHandler implements RequestHandlerInterface
 
     public function __construct(
         Router\RouterInterface $router,
-        Template\TemplateRendererInterface $template = null,
+        ?Template\TemplateRendererInterface $template = null,
         string $containerName
     ) {
         $this->router = $router;
diff --git a/src/App/Handler/LabelHandler.php b/src/App/Handler/LabelHandler.php
index e0bec98..4e04ac6 100644
--- a/src/App/Handler/LabelHandler.php
+++ b/src/App/Handler/LabelHandler.php
@@ -24,7 +24,7 @@ class LabelHandler implements RequestHandlerInterface
 
     public function __construct(
         Router\RouterInterface $router,
-        Template\TemplateRendererInterface $template = null,
+        ?Template\TemplateRendererInterface $template = null,
         string $containerName
     ) {
         $this->router = $router;
diff --git a/src/App/Handler/LayerHandler.php b/src/App/Handler/LayerHandler.php
index 6c263ff..87a4532 100644
--- a/src/App/Handler/LayerHandler.php
+++ b/src/App/Handler/LayerHandler.php
@@ -24,7 +24,7 @@ class LayerHandler implements RequestHandlerInterface
 
     public function __construct(
         Router\RouterInterface $router,
-        Template\TemplateRendererInterface $template = null,
+        ?Template\TemplateRendererInterface $template = null,
         string $containerName
     ) {
         $this->router = $router;
diff --git a/src/App/Handler/MapFileHandler.php b/src/App/Handler/MapFileHandler.php
index b50cd55..317d523 100644
--- a/src/App/Handler/MapFileHandler.php
+++ b/src/App/Handler/MapFileHandler.php
@@ -22,7 +22,7 @@ class MapFileHandler implements RequestHandlerInterface
 
     public function __construct(
         Router\RouterInterface $router,
-        Template\TemplateRendererInterface $template = null,
+        ?Template\TemplateRendererInterface $template = null,
         string $containerName
     ) {
         $this->router = $router;
diff --git a/src/App/Handler/MapHandler.php b/src/App/Handler/MapHandler.php
index b15963f..791c57c 100644
--- a/src/App/Handler/MapHandler.php
+++ b/src/App/Handler/MapHandler.php
@@ -23,7 +23,7 @@ class MapHandler implements RequestHandlerInterface
 
     public function __construct(
         Router\RouterInterface $router,
-        Template\TemplateRendererInterface $template = null,
+        ?Template\TemplateRendererInterface $template = null,
         string $containerName
     ) {
         $this->router = $router;
diff --git a/src/App/Handler/OpenHandler.php b/src/App/Handler/OpenHandler.php
index 39cd2c4..7bfd2f5 100644
--- a/src/App/Handler/OpenHandler.php
+++ b/src/App/Handler/OpenHandler.php
@@ -25,7 +25,7 @@ class OpenHandler implements RequestHandlerInterface
 
     public function __construct(
         Router\RouterInterface $router,
-        Template\TemplateRendererInterface $template = null,
+        ?Template\TemplateRendererInterface $template = null,
         string $containerName
     ) {
         $this->router = $router;
diff --git a/src/App/Handler/StyleHandler.php b/src/App/Handler/StyleHandler.php
index 0681c91..9fa944d 100644
--- a/src/App/Handler/StyleHandler.php
+++ b/src/App/Handler/StyleHandler.php
@@ -24,7 +24,7 @@ class StyleHandler implements RequestHandlerInterface
 
     public function __construct(
         Router\RouterInterface $router,
-        Template\TemplateRendererInterface $template = null,
+        ?Template\TemplateRendererInterface $template = null,
         string $containerName
     ) {
         $this->router = $router;