diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 0161969..8c52481 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -7,7 +7,7 @@ on:
 jobs:
   build:
 
-    runs-on: macos-15
+    runs-on: macos-26
 
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index c2de69d..3f14436 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -7,7 +7,7 @@ on:
 jobs:
   build:
 
-    runs-on: macos-15
+    runs-on: macos-26
 
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6