diff --git a/.github/workflows/daily.yaml b/.github/workflows/daily.yaml
index 8ef5c1a..fcb8fd7 100644
--- a/.github/workflows/daily.yaml
+++ b/.github/workflows/daily.yaml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, macos-15, windows-2025]
+        os: [ubuntu-24.04, macos-26, windows-2025]
         python-version: ["3.12", "3.13", "3.14"]
 
     steps:
diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 02cbeba..df45ac0 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, macos-15, windows-2025]
+        os: [ubuntu-24.04, macos-26, windows-2025]
         python-version: ["3.12", "3.13", "3.14"]
 
     steps:
diff --git a/.github/workflows/weekly-docs.yaml b/.github/workflows/weekly-docs.yaml
index 709b323..a33caec 100644
--- a/.github/workflows/weekly-docs.yaml
+++ b/.github/workflows/weekly-docs.yaml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-24.04, windows-2025, macos-15]
+        os: [ubuntu-24.04, windows-2025, macos-26]
         python-version: ["3.12", "3.13", "3.14"]
     timeout-minutes: 30