diff --git a/src/Actions/DownloadAction.php b/src/Actions/DownloadAction.php
index 1d0e14b..62f6c23 100644
--- a/src/Actions/DownloadAction.php
+++ b/src/Actions/DownloadAction.php
@@ -13,7 +13,7 @@
  */
 class DownloadAction extends AbstractAction
 {
-    const DATA_DIRECTORY = __DIR__ . '/../../data/';
+    public const DATA_DIRECTORY = __DIR__ . '/../../data/';
 
     /**
      * Action to download file
diff --git a/src/FormGenerator/Form.php b/src/FormGenerator/Form.php
index c6f6659..7794bf3 100644
--- a/src/FormGenerator/Form.php
+++ b/src/FormGenerator/Form.php
@@ -19,11 +19,11 @@
  */
 class Form
 {
-    const DATA_DIR = __DIR__ . '/../../data/';
+    public const DATA_DIR = __DIR__ . '/../../data/';
 
-    const MODE_SHOW = 'show';
-    const MODE_SAVE = 'save';
-    const MODE_SEND = 'send';
+    public const MODE_SHOW = 'show';
+    public const MODE_SAVE = 'save';
+    public const MODE_SEND = 'send';
 
     /**
      * @var string
diff --git a/src/FormGenerator/FormRenderer.php b/src/FormGenerator/FormRenderer.php
index 0aa8d37..7456d91 100644
--- a/src/FormGenerator/FormRenderer.php
+++ b/src/FormGenerator/FormRenderer.php
@@ -13,7 +13,7 @@
  */
 class FormRenderer
 {
-    const TEMPLATE_DIR = __DIR__ . '/../../view/';
+    public const TEMPLATE_DIR = __DIR__ . '/../../view/';
 
     /**
      * @var TemplateWrapper
diff --git a/src/FormGenerator/FormValidator.php b/src/FormGenerator/FormValidator.php
index a04903b..ea71018 100644
--- a/src/FormGenerator/FormValidator.php
+++ b/src/FormGenerator/FormValidator.php
@@ -15,7 +15,7 @@
  */
 class FormValidator
 {
-    const COLORS_BULMA = [
+    public const COLORS_BULMA = [
         'white',
         'black',
         'light',
diff --git a/src/Service/FileExporter.php b/src/Service/FileExporter.php
index cf031cc..878ac02 100644
--- a/src/Service/FileExporter.php
+++ b/src/Service/FileExporter.php
@@ -11,7 +11,7 @@
  */
 class FileExporter
 {
-    const ROOT_DIR = __DIR__ . '/../../';
+    public const ROOT_DIR = __DIR__ . '/../../';
 
     /**
      * @var string
diff --git a/src/Service/LangManager.php b/src/Service/LangManager.php
index 85c7331..638abfc 100644
--- a/src/Service/LangManager.php
+++ b/src/Service/LangManager.php
@@ -10,9 +10,9 @@
  */
 class LangManager
 {
-    const LANG_FILE_PATH_GLOBAL = __DIR__ . '/../../conf/language.default.yaml';
-    const LANG_FILE_PATH_LOCAL = __DIR__ . '/../../conf/language.local.yaml';
-    const LANG_FILE_PATH_DYNAMIC = __DIR__ . '/../../conf/language.{{language}}.yaml';
+    public const LANG_FILE_PATH_GLOBAL = __DIR__ . '/../../conf/language.default.yaml';
+    public const LANG_FILE_PATH_LOCAL = __DIR__ . '/../../conf/language.local.yaml';
+    public const LANG_FILE_PATH_DYNAMIC = __DIR__ . '/../../conf/language.{{language}}.yaml';
 
     /**
      * Language strings.