diff --git a/.github/workflows/clang-tidy.yml b/.github/workflows/clang-tidy.yml
index 93ffb1c..5fd86c7 100644
--- a/.github/workflows/clang-tidy.yml
+++ b/.github/workflows/clang-tidy.yml
@@ -17,7 +17,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v1
       name: checkout
diff --git a/.github/workflows/compilers.yml b/.github/workflows/compilers.yml
index 2458d76..17fd9c7 100644
--- a/.github/workflows/compilers.yml
+++ b/.github/workflows/compilers.yml
@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macOS-latest]
+        os: [ubuntu-24.04, macos-15]
         compiler: [{
           "cc": "gcc",
           "cxx": "g++"
@@ -30,7 +30,7 @@ jobs:
           "cxx": "clang++"
          }]
         exclude:
-          - os: macOS-latest
+          - os: macos-15
             compiler:
               cc: gcc
     steps:
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index f2e1cf0..fb3664f 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -18,7 +18,7 @@ on:
 jobs:
   coverage:
     name: "codecov"
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
     - name: checkout
       uses: actions/checkout@v1
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a4a45b3..12d6417 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -38,7 +38,7 @@ jobs:
          - name: "Undefined Behavior Sanitizer"
            sanitizer: UBSAN
     name: "${{ matrix.options.name }}"
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: checkout
         uses: actions/checkout@v1