diff --git a/part4/bloglist/controllers/blogs.js b/part4/bloglist/controllers/blogs.js
index 3f6123d..c100603 100644
--- a/part4/bloglist/controllers/blogs.js
+++ b/part4/bloglist/controllers/blogs.js
@@ -31,4 +31,17 @@ blogsRouter.delete('/:id', async (request, response) => {
   response.status(204).end()
 })
 
+blogsRouter.put('/:id', async (request, response) => {
+  const body = request.body
+
+  const blog = await Blog.findByIdAndUpdate(request.params.id, {
+    title: body.title,
+    author: body.author,
+    url: body.url,
+    likes: body.likes
+  }, { new: true })
+
+  response.status(200).json(blog)
+})
+
 module.exports = blogsRouter
\ No newline at end of file
diff --git a/part4/bloglist/requests/update_blog.rest b/part4/bloglist/requests/update_blog.rest
new file mode 100644
index 0000000..a5ea610
--- /dev/null
+++ b/part4/bloglist/requests/update_blog.rest
@@ -0,0 +1,7 @@
+PUT http://localhost:3001/api/blogs/6477906c6320872422793b7a
+content-type: application/json
+
+{
+    "title": "Updated blog", "author": "Hans", "url": "www.andrew.eu", "likes": 5000
+
+}
\ No newline at end of file
diff --git a/part4/bloglist/tests/blog_api.test.js b/part4/bloglist/tests/blog_api.test.js
index ce909e2..5c24e25 100644
--- a/part4/bloglist/tests/blog_api.test.js
+++ b/part4/bloglist/tests/blog_api.test.js
@@ -84,6 +84,40 @@ describe('adding blog', () => {
   })
 })
 
+describe('deleting blog', () => {
+  test('a blog can be deleted', async () => {
+    const blogsAtStart = await helper.blogsInDb()
+    const blogToDelete = blogsAtStart[0]
+
+    await api.delete(`/api/blogs/${blogToDelete.id}`).expect(204)
+
+    const blogsAtEnd = await helper.blogsInDb()
+    expect(blogsAtEnd).toHaveLength(helper.initialBlogs.length - 1)
+    const contents = blogsAtEnd.map((r) => r.title)
+    expect(contents).not.toContain(blogToDelete.title)
+  })
+})
+
+describe('updating blog', () => {
+  test('a blog can be updated', async () => {
+    const blogsAtStart = await helper.blogsInDb()
+    const blogToUpdate = blogsAtStart[0]
+
+    const newBlog = {
+      title: 'Updated blog',
+      author: blogToUpdate.author,
+      url: blogToUpdate.url,
+      likes: blogToUpdate.likes
+    }
+
+    await api.put(`/api/blogs/${blogToUpdate.id}`).send(newBlog).expect(200)
+
+    const blogsAtEnd = await helper.blogsInDb()
+    expect(blogsAtEnd).toHaveLength(helper.initialBlogs.length)
+    const contents = blogsAtEnd.map((r) => r.title)
+    expect(contents).toContain('Updated blog')
+  })
+})
 
 describe('blog id check', () => {
   test('blog id is defined', async () => {