diff --git a/src/use-cases/category-converter-use-case.js b/src/use-cases/category-converter-use-case.js
index d55b2b0..8a4d2af 100644
--- a/src/use-cases/category-converter-use-case.js
+++ b/src/use-cases/category-converter-use-case.js
@@ -1,11 +1,15 @@
-
 class CategoryConverterUseCase {
-  constructor({categoriesMapping}) {
-    this.categoriesMapping = categoriesMapping
+  constructor({ categoriesMapping }) {
+    if (CategoryConverterUseCase.instance) {
+      return CategoryConverterUseCase.instance;
+    }
+
+    this.categoriesMapping = categoriesMapping;
+    CategoryConverterUseCase.instance = this;
   }
 
   execute(category) {
-    const entry = this.categoriesMapping.find(item => item.id === category)
+    const entry = this.categoriesMapping.find(item => item.id === category);
 
     return entry ? entry.related[0].split(', ').map(str => str.trim()) : null;
   }