diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4a817da..cf5843a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,7 +13,7 @@ jobs:
       matrix:
         swift-image:
           - swift:5.10-noble
-          - swiftlang/swift:nightly-6.0-jammy
+          - swift:6.0-noble
           - swiftlang/swift:nightly-main-jammy
 
     runs-on: ubuntu-latest
diff --git a/Package.swift b/Package.swift
index 64d6012..00039f8 100644
--- a/Package.swift
+++ b/Package.swift
@@ -21,7 +21,7 @@ let package = Package(
     dependencies: [
         .package(
             url: "https://github.com/swiftlang/swift-syntax",
-            "510.0.0" ..< "601.0.0-latest"
+            "509.0.0" ..< "601.0.0-latest"
         ),
         .package(
             url: "https://github.com/hummingbird-project/swift-mustache",
diff --git a/Package@swift-6.0.swift b/Package@swift-6.0.swift
index 8ea873c..634c228 100644
--- a/Package@swift-6.0.swift
+++ b/Package@swift-6.0.swift
@@ -21,7 +21,7 @@ let package = Package(
     dependencies: [
         .package(
             url: "https://github.com/swiftlang/swift-syntax",
-            "510.0.0" ..< "601.0.0-latest"
+            "509.0.0" ..< "601.0.0-latest"
         ),
         .package(
             url: "https://github.com/hummingbird-project/swift-mustache",