diff --git a/frontend/src/components/BooksAddEdit.vue b/frontend/src/components/BooksAddEdit.vue
index 17d0f16..7a9439a 100644
--- a/frontend/src/components/BooksAddEdit.vue
+++ b/frontend/src/components/BooksAddEdit.vue
@@ -257,7 +257,7 @@
         // Finally Send it
         // If we want to newly insert it, make a different request
         if (this.edit) {
-          HTTP.put('books/' + this.book.ID, {book: this.book})
+          HTTP.post('books/' + this.book.ID, {book: this.book})
             .then(response => {
               this.loading = false
               this.success = 'The book was successfully updated!'
diff --git a/models/books_add.go b/models/books_add.go
index f46e3b4..f9937e3 100644
--- a/models/books_add.go
+++ b/models/books_add.go
@@ -15,8 +15,8 @@ sie in die Datenbank eingetragen und mit dem Buch verknüpft.
 
 */
 
-// AddBook adds a new book, it takes a book struct with author and publisher. Inserts them if they don't already exist
-func AddBook(book Book) (newBook Book, err error) {
+// AddOrUpdateBook adds a new book or updates an existing one, it takes a book struct with author and publisher. Inserts them if they don't already exist
+func AddOrUpdateBook(book Book) (newBook Book, err error) {
 
 	// Take Publisher, check if it exists. If not, insert it
 	exists := false
@@ -36,24 +36,31 @@ func AddBook(book Book) (newBook Book, err error) {
 	}
 
 	if !exists {
-		bookToBeInserted := new(Publisher)
-		bookToBeInserted.Name = book.PublisherFull.Name
-		_, err = x.Insert(bookToBeInserted)
+		newPublisher, err := AddPublisher(Publisher{Name:book.PublisherFull.Name})
 		if err != nil {
 			return Book{}, err
 		}
 
-		book.Publisher = bookToBeInserted.ID
+		book.Publisher = newPublisher.ID
 	}
 
 	// Save the quantity for later use
 	qty := book.Quantity
 
-	// Insert the Book
-	_, err = x.Insert(&book)
+	// If we have an ID, try to update the book, otherwise create it
+	if book.ID == 0 {
+		// Insert the book
+		_, err = x.Insert(&book)
 
-	if err != nil {
-		return Book{}, err
+		if err != nil {
+			return Book{}, err
+		}
+	} else {
+		// Update the book
+		_, err := x.Id(book.ID).Update(book)
+		if err != nil {
+			return Book{}, err
+		}
 	}
 
 	// Set the Quantity
diff --git a/routes/api/v1/books_add.go b/routes/api/v1/books_add.go
index 3a4b90d..e04356b 100644
--- a/routes/api/v1/books_add.go
+++ b/routes/api/v1/books_add.go
@@ -37,7 +37,7 @@ func BookAdd(c echo.Context) error {
 	}
 
 	// Insert the book
-	newBook, err := models.AddBook(bookToInsert)
+	newBook, err := models.AddOrUpdateBook(bookToInsert)
 
 	if err != nil {
 		return c.JSON(http.StatusInternalServerError, models.Message{"Error"})
diff --git a/routes/routes.go b/routes/routes.go
index a208153..f986eec 100644
--- a/routes/routes.go
+++ b/routes/routes.go
@@ -86,7 +86,7 @@ func RegisterRoutes(e *echo.Echo) {
 	// Manage Books
 	a.PUT("/books", apiv1.BookAdd)
 	a.DELETE("/books/:id", apiv1.BookDelete)
-	a.POST("/books/:id", apiv1.BookDelete)
+	a.POST("/books/:id", apiv1.BookAdd)
 
 	// Manage Authors
 	a.PUT("/authors", apiv1.AuthorAdd)