diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 53e2cba..ed5b4e6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,9 +18,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      # macos-latest already ships the default Xcode; selecting a version by path is
-      # brittle because runner images move it. Print it instead so a failure log says
-      # which toolchain produced it.
       - name: Show toolchain
         run: |
           xcode-select -p
diff --git a/Package.swift b/Package.swift
index 7de6329..57362fd 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 6.4
+// swift-tools-version: 6.3
 import PackageDescription
 
 let package = Package(