diff --git a/Package.swift b/Package.swift
index 0283a6d..34762dd 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:6.0
+// swift-tools-version:5.6
 
 // Copyright 2022-2023 Buf Technologies, Inc.
 //
@@ -166,5 +166,5 @@ let package = Package(
             path: "Plugins/ConnectSwiftPlugin"
         ),
     ],
-    swiftLanguageModes: [.v6]
+    swiftLanguageVersions: [.version("6"), .v5]
 )