diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5a9c518..440ef5a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: macos-15
     name: Build & test (SwiftPM)
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Select Swift 6 toolchain
         uses: maxim-lobanov/setup-xcode@v1
         with:
@@ -37,7 +37,7 @@ jobs:
     runs-on: macos-15
     name: Format check (swift-format)
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Select Swift 6 toolchain
         uses: maxim-lobanov/setup-xcode@v1
         with: