diff --git a/.github/workflows/RunTests-macOS.yml b/.github/workflows/RunTests-macOS.yml
index 667a3b0..1a9b7ac 100644
--- a/.github/workflows/RunTests-macOS.yml
+++ b/.github/workflows/RunTests-macOS.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-13, ubuntu-latest]
-        swift: ["5.9"]
+        swift: ["5.8"]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: swift-actions/setup-swift@65540b95f51493d65f5e59e97dcef9629ddf11bf
diff --git a/Package.swift b/Package.swift
index cdd1318..a6999e1 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,10 +1,10 @@
-// swift-tools-version:5.9
+// swift-tools-version:5.8
 
 import PackageDescription
 
 let package = Package(
     name: "SwiftNES",
-    platforms: [.macOS(.v13), .iOS(.v17), .tvOS(.v17)],
+    platforms: [.macOS(.v13), .iOS(.v16), .tvOS(.v16)],
     products: [
         .library(
             name: "SwiftNES",