diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e732bdd..fc5e111 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,9 +39,10 @@ jobs:
     strategy:
       matrix:
         image:
-          - 'swift:5.6'
           - 'swift:5.7'
           - 'swift:5.8'
+          - 'swift:5.9'
+          - 'swiftlang/swift:nightly-5.10-jammy'
     
     container:
       image: ${{ matrix.image }}
diff --git a/Package.swift b/Package.swift
index f7d5ed7..2dc14f0 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.6
+// swift-tools-version:5.7
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription