diff --git a/Package.swift b/Package.swift
index 3b70c7c..fbb9ec4 100644
--- a/Package.swift
+++ b/Package.swift
@@ -18,7 +18,7 @@ let package = Package(
     )
   ],
   dependencies: [
-    .package(url: "https://github.com/apple/swift-syntax", "509.0.0"..<"601.0.0"),
+    .package(url: "https://github.com/apple/swift-syntax", "509.0.0"..<"601.0.0-prerelease"),
     .package(url: "https://github.com/pointfreeco/swift-macro-testing", from: "0.2.0"),
     .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.0.0"),
   ],
diff --git a/Package@swift-6.0.swift b/Package@swift-6.0.swift
index 341fc3f..2a44ca5 100644
--- a/Package@swift-6.0.swift
+++ b/Package@swift-6.0.swift
@@ -18,7 +18,7 @@ let package = Package(
     )
   ],
   dependencies: [
-    .package(url: "https://github.com/apple/swift-syntax", "509.0.0"..<"601.0.0"),
+    .package(url: "https://github.com/apple/swift-syntax", "509.0.0"..<"601.0.0-prerelease"),
     .package(url: "https://github.com/pointfreeco/swift-macro-testing", from: "0.2.0"),
     .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.0.0"),
   ],