diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index de1a20b656..fa74f705d6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -124,7 +124,7 @@ jobs:
           path: '**/build/reports'
 
   publish:
-    runs-on: macos-15
+    runs-on: macos-26
     if: github.repository == 'square/okio' && github.ref == 'refs/heads/master'
     needs: [jvm, all-platforms, emulator]
 
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index c532e2a765..748a8493bb 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -10,7 +10,7 @@ env:
 
 jobs:
   publish:
-    runs-on: macos-15
+    runs-on: macos-26
 
     steps:
       - uses: actions/checkout@v6