diff --git a/client/src/components/Dialogs/Category/DeleteCategoryDialog.js b/client/src/components/Dialogs/Category/DeleteCategoryDialog.js
index a50970f..66f26e3 100644
--- a/client/src/components/Dialogs/Category/DeleteCategoryDialog.js
+++ b/client/src/components/Dialogs/Category/DeleteCategoryDialog.js
@@ -6,6 +6,7 @@ import { useParams } from 'react-router-dom'
 import { Button, Dialog, DialogActions, DialogContent, DialogContentText, DialogTitle } from '@material-ui/core'
 import { useMutation } from '@apollo/react-hooks'
 
+import GET_TODOS from '../../../apollo/queries/todos/todos'
 import GET_CATEGORIES from '../../../apollo/queries/categories/categories'
 import DELETE_CATEGORY from '../../../apollo/mutations/categories/deleteCategoty'
 
@@ -21,6 +22,16 @@ const DeleteCategoryDialog = ({ isOpenDialog, handleCloseDialog }) => {
         query: GET_CATEGORIES,
         data: { categories: categories.filter(category => category.id !== deleteCategory.id) }
       })
+
+      try {
+        const { todos } = cache.readQuery({ query: GET_TODOS })
+        cache.writeQuery({
+          query: GET_TODOS,
+          data: { todos: todos.filter(todo => todo.category.id !== deleteCategory.id) }
+        })
+      } catch {
+        return null
+      }
     }
    })
 
diff --git a/server/resolvers/categoryResolvers.js b/server/resolvers/categoryResolvers.js
index 41a67a2..95d15b5 100644
--- a/server/resolvers/categoryResolvers.js
+++ b/server/resolvers/categoryResolvers.js
@@ -16,6 +16,8 @@ const categoryResolvers = {
     },
     deleteCategory: async (_, { id }) => {
       const deletedCategory = await Category.findByIdAndRemove(id)
+        await Todo.deleteMany({ categoryId: id })
+        
       return deletedCategory
     },
     updateCategory: (_, { id, title }) => Category.findByIdAndUpdate(id, { $set: { title, updatedAt: new Date().toISOString() } }, { new: true })