diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a98b6bbd1..e9a9ec538 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby: [ '2.6', '2.7', '3.0', '3.1', '3.2' ]
-        os: [ macOS-12 ]
+        os: [ macOS-13 ]
     runs-on: ${{ matrix.os }}
 
     name: Ruby ${{ matrix.ruby }} on ${{ matrix.os }}
diff --git a/vendor/libgit2 b/vendor/libgit2
index c6111ec06..338e6fb68 160000
--- a/vendor/libgit2
+++ b/vendor/libgit2
@@ -1 +1 @@
-Subproject commit c6111ec06cc0b0126cd67bdab78f8091e4cfaa10
+Subproject commit 338e6fb681369ff0537719095e22ce9dc602dbf0