diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d599d36753..94e4c05986 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -65,7 +65,7 @@ jobs:
             CC: riscv64-linux-gnu
           - arch: s390x
             CC: s390x-linux-gnu
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     env:
       AR: ${{ matrix.CC }}-ar
       CHOST: ${{ matrix.CC }}
@@ -131,7 +131,7 @@ jobs:
             target: x86_64-apple-darwin
           - arch: arm64
             target: arm64-apple-darwin
-    runs-on: macos-13
+    runs-on: macos-14
     env:
       LDFLAGS: -dead_strip
       SUFFIX: macos-${{ matrix.arch }}
diff --git a/.github/workflows/decnum.yml b/.github/workflows/decnum.yml
index 7ccdc5c6bf..18484dfcdc 100644
--- a/.github/workflows/decnum.yml
+++ b/.github/workflows/decnum.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   disabled:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Clone repository
         uses: actions/checkout@v4
diff --git a/.github/workflows/oniguruma.yml b/.github/workflows/oniguruma.yml
index ebe471debb..47d427acbd 100644
--- a/.github/workflows/oniguruma.yml
+++ b/.github/workflows/oniguruma.yml
@@ -9,7 +9,7 @@ on:
 # we test other options for --with-oniguruma here.
 jobs:
   installed:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Clone repository
         uses: actions/checkout@v4
@@ -41,7 +41,7 @@ jobs:
             tests/*.log
 
   disabled:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Clone repository
         uses: actions/checkout@v4
diff --git a/.github/workflows/valgrind.yml b/.github/workflows/valgrind.yml
index 6d0a855772..24b3a03b41 100644
--- a/.github/workflows/valgrind.yml
+++ b/.github/workflows/valgrind.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   linux:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Clone repository
         uses: actions/checkout@v4