diff --git a/packages/api/src/entity/post.ts b/packages/api/src/entity/post.ts
index d689d9202..3e8bf997e 100644
--- a/packages/api/src/entity/post.ts
+++ b/packages/api/src/entity/post.ts
@@ -20,10 +20,10 @@ export class Post {
   user!: User
 
   @Column('uuid', { array: true, nullable: true })
-  libraryItemIds?: string[]
+  libraryItemIds?: string[] | null
 
   @Column('uuid', { array: true, nullable: true })
-  highlightIds?: string[]
+  highlightIds?: string[] | null
 
   @Column('text')
   title!: string
@@ -32,10 +32,10 @@ export class Post {
   content!: string
 
   @Column('text', { nullable: true })
-  thumbnail?: string
+  thumbnail?: string | null
 
   @Column('text', { nullable: true })
-  thought?: string
+  thought?: string | null
 
   @Column('timestamptz')
   createdAt!: Date
diff --git a/packages/api/src/resolvers/function_resolvers.ts b/packages/api/src/resolvers/function_resolvers.ts
index 8bb629929..c2a8d83a3 100644
--- a/packages/api/src/resolvers/function_resolvers.ts
+++ b/packages/api/src/resolvers/function_resolvers.ts
@@ -151,7 +151,12 @@ import {
   webhookResolver,
   webhooksResolver,
 } from './index'
-import { createPostResolver, postResolver, postsResolver } from './posts'
+import {
+  createPostResolver,
+  postResolver,
+  postsResolver,
+  updatePostResolver,
+} from './posts'
 import {
   markEmailAsItemResolver,
   recentEmailsResolver,
@@ -319,6 +324,7 @@ export const functionResolvers = {
     updateFolderPolicy: updateFolderPolicyResolver,
     deleteFolderPolicy: deleteFolderPolicyResolver,
     createPost: createPostResolver,
+    updatePost: updatePostResolver,
   },
   Query: {
     me: getMeUserResolver,
@@ -906,4 +912,5 @@ export const functionResolvers = {
   ...resultResolveTypeResolver('Posts'),
   ...resultResolveTypeResolver('Post'),
   ...resultResolveTypeResolver('CreatePost'),
+  ...resultResolveTypeResolver('UpdatePost'),
 }
diff --git a/packages/api/src/resolvers/posts/index.ts b/packages/api/src/resolvers/posts/index.ts
index 2bde99791..e76ed3dd4 100644
--- a/packages/api/src/resolvers/posts/index.ts
+++ b/packages/api/src/resolvers/posts/index.ts
@@ -4,6 +4,7 @@ import {
   CreatePostErrorCode,
   CreatePostSuccess,
   MutationCreatePostArgs,
+  MutationUpdatePostArgs,
   PostEdge,
   PostErrorCode,
   PostResult,
@@ -12,12 +13,15 @@ import {
   QueryPostArgs,
   QueryPostsArgs,
   ResolverFn,
+  UpdatePostError,
+  UpdatePostErrorCode,
+  UpdatePostSuccess,
 } from '../../generated/graphql'
 import {
-  createPosts,
   createPublicPost,
   findPublicPostById,
   findPublicPostsByUserId,
+  updatePost,
 } from '../../services/post'
 import { Merge } from '../../util'
 import { authorized } from '../../utils/gql-utils'
@@ -135,3 +139,57 @@ export const createPostResolver = authorized<
     post,
   }
 })
+
+export const updatePostResolver = authorized<
+  Merge<UpdatePostSuccess, { post?: Post }>,
+  UpdatePostError,
+  MutationUpdatePostArgs
+>(async (_, { input }, { uid, log }) => {
+  const {
+    id,
+    title,
+    content,
+    highlightIds,
+    libraryItemIds,
+    thought,
+    thumbnail,
+  } = input
+
+  if (!id || title === null || content === null) {
+    log.error('Invalid args', { id })
+
+    return {
+      errorCodes: [UpdatePostErrorCode.BadRequest],
+    }
+  }
+
+  const result = await updatePost(uid, id, {
+    title,
+    content,
+    highlightIds,
+    libraryItemIds,
+    thought,
+    thumbnail,
+  })
+
+  if (!result.affected) {
+    log.error('Failed to update post', { id })
+
+    return {
+      errorCodes: [UpdatePostErrorCode.Unauthorized],
+    }
+  }
+
+  const post = await findPublicPostById(id)
+  if (!post) {
+    log.error('Post not found', { id })
+
+    return {
+      errorCodes: [UpdatePostErrorCode.Unauthorized],
+    }
+  }
+
+  return {
+    post,
+  }
+})
diff --git a/packages/api/src/schema.ts b/packages/api/src/schema.ts
index 07035d315..c36cb13e5 100755
--- a/packages/api/src/schema.ts
+++ b/packages/api/src/schema.ts
@@ -3378,8 +3378,8 @@ const schema = gql`
 
   input UpdatePostInput {
     id: ID!
-    title: String
-    content: String
+    title: String @sanitize(minLength: 1, maxLength: 255)
+    content: String @sanitize(minLength: 1)
     thumbnail: String
     libraryItemIds: [ID!]
     highlightIds: [ID!]
diff --git a/packages/api/src/services/post.ts b/packages/api/src/services/post.ts
index f67b0cd5c..f51b95f27 100644
--- a/packages/api/src/services/post.ts
+++ b/packages/api/src/services/post.ts
@@ -81,3 +81,13 @@ export const findPublicPostById = async (id: string) => {
     },
   })
 }
+
+export const updatePost = async (
+  userId: string,
+  postId: string,
+  post: Partial<Post>
+) => {
+  return authTrx(async (trx) => trx.getRepository(Post).update(postId, post), {
+    uid: userId,
+  })
+}
diff --git a/packages/api/test/resolvers/post.test.ts b/packages/api/test/resolvers/post.test.ts
index bc17c094f..0c28a0621 100644
--- a/packages/api/test/resolvers/post.test.ts
+++ b/packages/api/test/resolvers/post.test.ts
@@ -288,4 +288,99 @@ describe('Post Resolvers', () => {
       await deletePosts(loginUser.id, [postId])
     })
   })
+
+  describe('updatePostResolver', () => {
+    const mutation = `
+      mutation UpdatePost($input: UpdatePostInput!) {
+        updatePost(input: $input) {
+          ... on UpdatePostSuccess {
+            post {
+              id
+              title
+              content
+            }
+          }
+          ... on UpdatePostError {
+            errorCodes
+          }
+        }
+      }
+    `
+
+    let postId: string
+
+    before(async () => {
+      const post = {
+        title: 'Post',
+        content: 'Content',
+        user: loginUser,
+      }
+      const newPost = await createPosts(loginUser.id, [post])
+
+      postId = newPost[0].id
+    })
+
+    after(async () => {
+      await deletePosts(loginUser.id, [postId])
+    })
+
+    it('should return an error if the args are invalid', async () => {
+      const response = await graphqlRequest(mutation, authToken, {
+        input: {
+          id: postId,
+          title: null,
+          content: null,
+        },
+      })
+
+      expect(response.body.data.updatePost.errorCodes).to.eql(['BAD_REQUEST'])
+    })
+
+    it('should return an error if the post is not found', async () => {
+      const response = await graphqlRequest(mutation, authToken, {
+        input: {
+          id: generateFakeUuid(),
+          title: 'Post',
+          content: 'Content',
+        },
+      })
+
+      expect(response.body.data.updatePost.errorCodes).to.eql(['UNAUTHORIZED'])
+    })
+
+    it('should return an error if the user is not the owner of the post', async () => {
+      const notOwner = await createTestUser('notOwner')
+      const notOwnerToken = await loginAndGetAuthToken(notOwner.email)
+
+      const response = await graphqlRequest(mutation, notOwnerToken, {
+        input: {
+          id: postId,
+          title: 'Post',
+          content: 'Content',
+        },
+      })
+
+      expect(response.body.data.updatePost.errorCodes).to.eql(['UNAUTHORIZED'])
+
+      await deleteUser(notOwner.id)
+    })
+
+    it('should update the post', async () => {
+      const response = await graphqlRequest(mutation, authToken, {
+        input: {
+          id: postId,
+          title: 'Updated Post',
+          content: 'Updated Content',
+        },
+      })
+
+      expect(response.body.data.updatePost.post.title).to.eql('Updated Post')
+      expect(response.body.data.updatePost.post.content).to.eql(
+        'Updated Content'
+      )
+
+      const post = await findPublicPostById(postId)
+      expect(post?.title).to.eql('Updated Post')
+    })
+  })
 })