diff --git a/Sources/SGFKit/Collection.swift b/Sources/SGFKit/Collection.swift
index f6ebf0b..925e447 100644
--- a/Sources/SGFKit/Collection.swift
+++ b/Sources/SGFKit/Collection.swift
@@ -35,7 +35,7 @@ public final class Collection<Game: SGFKit.Game> {
     }
 }
 
-extension Collection: NodeDelegate {
+extension Collection: NodeProtocol {
     var number: Int? {
         -1
     }
diff --git a/Sources/SGFKit/Node.swift b/Sources/SGFKit/Node.swift
index a711f6c..cdf7aa6 100644
--- a/Sources/SGFKit/Node.swift
+++ b/Sources/SGFKit/Node.swift
@@ -1,4 +1,4 @@
-protocol NodeDelegate<Game>: AnyObject {
+protocol NodeProtocol<Game>: AnyObject {
     associatedtype Game: SGFKit.Game
 
     var number: Int? { get }
@@ -20,7 +20,7 @@ public final class Node<Game: SGFKit.Game> {
     /// The parent node of this node.
     public var parentNode: (Node<Game>)? { parent as? Node<Game> }
 
-    weak var parent: (any NodeDelegate<Game>)?
+    weak var parent: (any NodeProtocol<Game>)?
 
     /// The children of the node.
     ///
@@ -101,7 +101,7 @@ public final class Node<Game: SGFKit.Game> {
     }
 }
 
-extension Node: NodeDelegate {
+extension Node: NodeProtocol {
     func node(treeStructureDidUpdated index: Int?) {
         parent?.node(treeStructureDidUpdated: index)
     }