diff --git a/Package.swift b/Package.swift
index 5f8afbe0df88fb417b3923279cc268d371b270fc..1948c33aae7d5d4d25e4379663f52e22abc5eee9 100644
--- a/Package.swift
+++ b/Package.swift
@@ -37,5 +37,5 @@ let package = Package(
             name: "Alamofire",
             path: "Source")
     ],
-    swiftLanguageVersions: [3, 4]
+    swiftLanguageVersions: [.v3, .v4]
 )