diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 2384bb50..5fda7c21 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -28,7 +28,7 @@ jobs:
         os:
         - ubuntu-latest
         - macos-latest
-        - macos-14
+        - macos-15
         - windows-latest
         ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
         include:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c633fc68..d2a58bb9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
         os:
         - ubuntu-latest
         - macos-latest
-        - macos-14
+        - macos-15
         - windows-latest
         ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
         include: