diff --git a/datatables.json b/datatables.json
index bfb2811..96a025d 100644
--- a/datatables.json
+++ b/datatables.json
@@ -15,5 +15,5 @@
     ],
     "src-repo": "http://github.com/DataTables/Buttons",
     "last-tag": "2.3.4",
-    "last-sync": "30575e1db8a1d327908215f9952ce8ab35e3101a"
+    "last-sync": "48399b8f822f40cde08e0b56a0a84b70e8c6a678"
 }
\ No newline at end of file
diff --git a/types/types.d.ts b/types/types.d.ts
index 5b9668c..279b1ff 100644
--- a/types/types.d.ts
+++ b/types/types.d.ts
@@ -385,6 +385,13 @@ declare module 'datatables.net' {
 		 */
 		action?: FunctionButtonAction;
 
+		/**
+		 * Button HTML attributes
+		 */
+		attr?: {
+			[key: string]: string | number
+		};
+
 		/**
 		 * Ensure that any requirements have been satisfied before initialising a button
 		 */