diff --git a/Package.swift b/Package.swift
index aaa4bd4..57a9a60 100644
--- a/Package.swift
+++ b/Package.swift
@@ -21,7 +21,7 @@ let package = Package(
     dependencies: [
         .package(url: "https://github.com/apple/swift-async-algorithms.git", from: "1.0.0"),
         .package(url: "https://github.com/nicklockwood/SwiftFormat.git", from: "0.60.1"),
-        .package(url: "https://github.com/swiftlang/swift-syntax.git", "600.0.0" ..< "603.0.0"),
+        .package(url: "https://github.com/swiftlang/swift-syntax.git", "600.0.0" ..< "604.0.0"),
     ],
 
     targets: [
diff --git a/Sources/VexilMacros/FlagContainerMacro.swift b/Sources/VexilMacros/FlagContainerMacro.swift
index 57c482b..de4c779 100644
--- a/Sources/VexilMacros/FlagContainerMacro.swift
+++ b/Sources/VexilMacros/FlagContainerMacro.swift
@@ -23,6 +23,7 @@ extension FlagContainerMacro: MemberMacro {
     public static func expansion(
         of node: AttributeSyntax,
         providingMembersOf declaration: some DeclGroupSyntax,
+        conformingTo protocols: [TypeSyntax],
         in context: some MacroExpansionContext,
     ) throws -> [DeclSyntax] {
         // If the declaration doesn't have any scopes attached we might be inheriting scopes from a public extension