diff --git a/src/Generators/RandomLowerCaseWord.php b/src/Generators/RandomLowerCaseWord.php
index 5bb30d1..d79d3db 100644
--- a/src/Generators/RandomLowerCaseWord.php
+++ b/src/Generators/RandomLowerCaseWord.php
@@ -7,7 +7,7 @@
 /**
  * Class RandomLowerCaseWord
  */
-class RandomLowerCaseWord implements RandomGeneratorInterface
+final class RandomLowerCaseWord implements RandomGeneratorInterface
 {
     use ManageRandomItemsTrait;
     use DictionaryWordTrait;
diff --git a/src/Generators/RandomUpperCaseWord.php b/src/Generators/RandomUpperCaseWord.php
index 14b7f33..a98004a 100644
--- a/src/Generators/RandomUpperCaseWord.php
+++ b/src/Generators/RandomUpperCaseWord.php
@@ -7,7 +7,7 @@
 /**
  * Class RandomUpperCaseWord
  */
-class RandomUpperCaseWord implements RandomGeneratorInterface
+final class RandomUpperCaseWord implements RandomGeneratorInterface
 {
     use ManageRandomItemsTrait;
     use DictionaryWordTrait;