diff --git a/Package.swift b/Package.swift
index 8b0530959..9becff554 100644
--- a/Package.swift
+++ b/Package.swift
@@ -17,7 +17,7 @@ let package = Package(
             targets: ["OpenAPIKit"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/jpsim/Yams.git", from: "4.0.0") // just for tests
+        .package(url: "https://github.com/jpsim/Yams.git", "4.0.0"..<"6.0.0") // just for tests
     ],
     targets: [
         .target(