diff --git a/Slack/Slack.BlockKit/Classes/Layout/Input.cs b/Slack/Slack.BlockKit/Classes/Layout/Input.cs
index e7ddb4f..80269aa 100644
--- a/Slack/Slack.BlockKit/Classes/Layout/Input.cs
+++ b/Slack/Slack.BlockKit/Classes/Layout/Input.cs
@@ -10,6 +10,8 @@ public class Input : Block
             private const int labelTextLength = 2000;
             private object _element;
             private PlainText _hint;
+            private string _block_id;
+            private const int block_idLength = 255;
             private const int hintTextLength = 2000;
             public bool optional;
 
@@ -44,6 +46,18 @@ public object element
                     }
                 }
             }
+
+            public string block_id
+            {
+                get => _block_id; set
+                {
+                    if (value.Length > block_idLength)
+                    {
+                        throw new System.Exception($"block_id length must be less than {block_idLength} characters.");
+                    }
+                    _block_id = value;
+                }
+            }
             public PlainText hint
             {
                 get => _hint; set