diff --git a/Src/Notion.Client/Api/Blocks/RequestParams/BlocksUpdateParameters/UpdateBlocks/BookmarkUpdateBlock.cs b/Src/Notion.Client/Api/Blocks/RequestParams/BlocksUpdateParameters/UpdateBlocks/BookmarkUpdateBlock.cs
new file mode 100644
index 00000000..71b0cec6
--- /dev/null
+++ b/Src/Notion.Client/Api/Blocks/RequestParams/BlocksUpdateParameters/UpdateBlocks/BookmarkUpdateBlock.cs
@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using Newtonsoft.Json;
+
+namespace Notion.Client
+{
+    public class BookmarkUpdateBlock : IUpdateBlock
+    {
+        public bool Archived { get; set; }
+
+        [JsonProperty("bookmark")]
+        public Data Bookmark { get; set; }
+
+        public class Data
+        {
+            [JsonProperty("url")]
+            public string Url { get; set; }
+
+            [JsonProperty("caption")]
+            public IEnumerable<RichTextBaseInput> Caption { get; set; }
+        }
+    }
+}
diff --git a/Src/Notion.Client/Models/Blocks/BookmarkBlock.cs b/Src/Notion.Client/Models/Blocks/BookmarkBlock.cs
index f4df3a90..c0380b73 100644
--- a/Src/Notion.Client/Models/Blocks/BookmarkBlock.cs
+++ b/Src/Notion.Client/Models/Blocks/BookmarkBlock.cs
@@ -1,4 +1,5 @@
-using Newtonsoft.Json;
+using System.Collections.Generic;
+using Newtonsoft.Json;
 
 namespace Notion.Client
 {
@@ -13,6 +14,9 @@ public class Info
         {
             [JsonProperty("url")]
             public string Url { get; set; }
+
+            [JsonProperty("caption")]
+            public IEnumerable<RichTextBase> Caption { get; set; }
         }
     }
 }
diff --git a/Test/Notion.IntegrationTests/IBlocksClientTests.cs b/Test/Notion.IntegrationTests/IBlocksClientTests.cs
index 88294504..58909160 100644
--- a/Test/Notion.IntegrationTests/IBlocksClientTests.cs
+++ b/Test/Notion.IntegrationTests/IBlocksClientTests.cs
@@ -146,5 +146,101 @@ public async Task DeleteAsync_DeleteBlockWithGivenId()
                 Archived = true
             });
         }
+
+        [Theory]
+        [MemberData(nameof(BlockData))]
+        public async Task UpdateAsync_UpdatesGivenBlock(Block block, IUpdateBlock updateBlock, Action<Block> assert)
+        {
+            var options = new ClientOptions
+            {
+                AuthToken = Environment.GetEnvironmentVariable("NOTION_AUTH_TOKEN")
+            };
+            INotionClient _client = NotionClientFactory.Create(options);
+
+            var pageParentId = "3c357473a28149a488c010d2b245a589";
+
+            var page = await _client.Pages.CreateAsync(
+                PagesCreateParametersBuilder.Create(
+                    new ParentPageInput
+                    {
+                        PageId = pageParentId
+                    }
+                ).Build()
+            );
+
+            var blocks = await _client.Blocks.AppendChildrenAsync(
+                page.Id,
+                new BlocksAppendChildrenParameters
+                {
+                    Children = new List<Block>()
+                    {
+                        block
+                    }
+                }
+            );
+
+            var blockId = blocks.Results.First().Id;
+            await _client.Blocks.UpdateAsync(blockId, updateBlock);
+
+            blocks = await _client.Blocks.RetrieveChildrenAsync(page.Id);
+            blocks.Results.Should().HaveCount(1);
+
+            var updatedBlock = blocks.Results.First();
+
+            assert.Invoke(updatedBlock);
+
+            // cleanup
+            await _client.Pages.UpdateAsync(page.Id, new PagesUpdateParameters
+            {
+                Archived = true
+            });
+        }
+
+        private static IEnumerable<object[]> BlockData()
+        {
+            return new List<object[]>
+            {
+                new object[] {
+                    new BookmarkBlock
+                    {
+                        Bookmark = new BookmarkBlock.Info
+                        {
+                            Url = "https://developers.notion.com/reference/rich-text",
+                            Caption = new List<RichTextBase>
+                            {
+                                new RichTextTextInput
+                                {
+                                    Text = new Text
+                                    {
+                                        Content = "Notion API"
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    new BookmarkUpdateBlock {
+                        Bookmark = new BookmarkUpdateBlock.Data
+                        {
+                            Url = "https://github.com/notion-dotnet/notion-sdk-net",
+                            Caption = new List<RichTextBaseInput>
+                            {
+                                new RichTextTextInput
+                                {
+                                    Text = new Text
+                                    {
+                                        Content = "Github"
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    new Action<Block>((block) => {
+                        var updatedBlock = (BookmarkBlock)block;
+                        Assert.Equal("https://github.com/notion-dotnet/notion-sdk-net", updatedBlock.Bookmark.Url);
+                        Assert.Equal("Github", updatedBlock.Bookmark.Caption.OfType<RichTextText>().First().Text.Content);
+                    })
+                }
+            };
+        }
     }
 }