diff --git a/web/src/stores/budget-account.ts b/web/src/stores/budget-account.ts
index b8f36da..a56f0fc 100644
--- a/web/src/stores/budget-account.ts
+++ b/web/src/stores/budget-account.ts
@@ -104,16 +104,17 @@ export const useAccountStore = defineStore("budget/account", {
             const response = await result.json();
             this.addCategoriesForMonth(year, month, response.Categories);
         },
-        addCategoriesForMonth(year : number, month : number, categories : Category[]) : void {
-            const yearMap = this.Months.get(year) || new Map<number, Map<string, Category>>();
-            this.Months.set(year, yearMap);
+        addCategoriesForMonth(year: number, month: number, categories: Category[]): void {
+            this.$patch((state) => {
+                const yearMap = state.Months.get(year) || new Map<number, Map<string, Category>>();
+                const monthMap = yearMap.get(month) || new Map<string, Category>();
+                for (const category of categories) {
+                    monthMap.set(category.ID, category);
+                }
 
-            const monthMap = yearMap.get(month) || new Map<string, Category>();
-            yearMap.set(month, monthMap);
-
-            for (const category of categories){
-                monthMap.set(category.ID, category);
-            }
+                yearMap.set(month, monthMap);
+                state.Months.set(year, yearMap);
+            });
         },
         logout() {
             this.$reset()