diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index 552cdd5..7542567 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -4,10 +4,17 @@ on: push
 
 jobs:
   build:
-
+  
+    strategy:
+      matrix:
+        swift: ["5.9", "5.10"]
+    
     runs-on: macos-latest
 
     steps:
+    - uses: swift-actions/setup-swift@v2
+      with:
+        swift-version: ${{ matrix.swift }}
     - uses: actions/checkout@v2
     - name: Build
       run: swift build -v
diff --git a/Package.swift b/Package.swift
index 93297b1..4945932 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.5
+// swift-tools-version:5.8
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
diff --git a/Sources/YouTubeKit/Extensions/URLSessionDelegates.swift b/Sources/YouTubeKit/Extensions/URLSessionDelegates.swift
index 2cc1fcf..9e7183e 100644
--- a/Sources/YouTubeKit/Extensions/URLSessionDelegates.swift
+++ b/Sources/YouTubeKit/Extensions/URLSessionDelegates.swift
@@ -13,7 +13,11 @@ final class ConfigurableURLSessionDelegate: NSObject, URLSessionTaskDelegate {
     let applyCookiesOnRedirect: Bool
     let saveIntermediateResponses: Bool
     
+#if swift(>=5.10)
     nonisolated(unsafe) var intermediateResponses = [HTTPURLResponse]()
+#else
+    var intermediateResponses = [HTTPURLResponse]()
+#endif
     
     init(allowsRedirect: Bool, applyCookiesOnRedirect: Bool, saveIntermediateResponses: Bool) {
         self.allowsRedirects = allowsRedirect
diff --git a/Sources/YouTubeKit/YouTube.swift b/Sources/YouTubeKit/YouTube.swift
index 6f65de6..9f8e020 100644
--- a/Sources/YouTubeKit/YouTube.swift
+++ b/Sources/YouTubeKit/YouTube.swift
@@ -14,8 +14,13 @@ public class YouTube {
     private var _js: String?
     private var _jsURL: URL?
     
+#if swift(>=5.10)
     nonisolated(unsafe) private static var __js: String? // caches js between calls
     nonisolated(unsafe) private static var __jsURL: URL?
+#else
+    private static var __js: String? // caches js between calls
+    private static var __jsURL: URL?
+#endif
     
     private var _videoInfos: [InnerTube.VideoInfo]?