diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index c178741470d..2d751e7384b 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -142,7 +142,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Run actionlint
-        uses: docker://rhysd/actionlint:1.7.7
+        uses: docker://rhysd/actionlint:1.7.8
         with:
           args: -color
 
diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 948a72fd9c0..3c14dadba42 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -17,12 +17,9 @@ jobs:
       fail-fast: false
       matrix:
         platform:
-          - os: darwin
-            cpu: x86_64
-            base: macos-13 # always x86_64-darwin
           - os: darwin
             cpu: arm64
-            base: macos-14 # always arm64-darwin
+            base: macos-15 # always arm64-darwin
           - os: linux
             cpu: x86_64
             base: ubuntu-24.04 # always x86_64-linux-gnu
diff --git a/.github/workflows/test-macos.yaml b/.github/workflows/test-macos.yaml
index beab365f4c0..b071f8ab597 100644
--- a/.github/workflows/test-macos.yaml
+++ b/.github/workflows/test-macos.yaml
@@ -17,11 +17,8 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - macos-13
+          - macos-15
         ruby:
-          - '2.5'
-          - '2.6'
-          - '2.7'
           - '3.0'
           - '3.1'
           - '3.2'