diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index fe52f37..1526f3d 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -12,7 +12,7 @@ jobs:
       - name: Configure Swift version
         uses: swift-actions/setup-swift@v1
         with:
-          swift-version: "5.8"
+          swift-version: "5.9"
       - name: Build
         run: swift build -v
       - name: Run tests
diff --git a/Package.swift b/Package.swift
index 4fbce1d..26f7c75 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.8
+// swift-tools-version:5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription