diff --git a/.github/workflows/release-llvm.yml b/.github/workflows/release-llvm.yml
index c67b7173..fbfae6d7 100644
--- a/.github/workflows/release-llvm.yml
+++ b/.github/workflows/release-llvm.yml
@@ -54,11 +54,13 @@ jobs:
           - target: aarch64-apple-darwin
             builder-arg: gnu
             host: macos
-            runner: macos-14
+            runner: macos-15
           - target: x86_64-apple-darwin
             builder-arg: gnu
             host: macos
-            runner: macos-13
+            # `macos-15-intel` will be the last x86_64 `macos` image supported by GHA.
+            # It will be available until Aug. 2027 (see https://github.com/actions/runner-images/issues/13045).
+            runner: macos-15-intel
           - target: x86_64-pc-windows-msvc
             builder-arg: gnu
             host: windows
diff --git a/.github/workflows/release-nightly.yml b/.github/workflows/release-nightly.yml
index d3b5225a..b888629d 100644
--- a/.github/workflows/release-nightly.yml
+++ b/.github/workflows/release-nightly.yml
@@ -59,7 +59,7 @@ jobs:
     outputs:
       resolc-universal-apple-darwin_url: ${{ steps.set-output.outputs.resolc-universal-apple-darwin_url }}
       resolc-universal-apple-darwin_sha: ${{ steps.set-output.outputs.resolc-universal-apple-darwin_sha }}
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
       - uses: actions/download-artifact@v4
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a0d34e6e..ed4b5fcf 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -69,7 +69,7 @@ jobs:
   create-release:
     if: startsWith(github.ref_name, 'v')
     needs: [check-version-changed, build]
-    runs-on: macos-14
+    runs-on: macos-15
     environment: tags
     steps:
       - name: Download Artifacts
@@ -126,7 +126,7 @@ jobs:
 
   npm-release:
     needs: [create-release]
-    runs-on: macos-14
+    runs-on: macos-15
     environment: tags
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/reusable-build.yml b/.github/workflows/reusable-build.yml
index e86d392f..cc2cd1c1 100644
--- a/.github/workflows/reusable-build.yml
+++ b/.github/workflows/reusable-build.yml
@@ -66,10 +66,12 @@ jobs:
             runner: ubuntu-24.04
           - target: aarch64-apple-darwin
             type: native
-            runner: macos-14
+            runner: macos-15
           - target: x86_64-apple-darwin
             type: native
-            runner: macos-13
+            # `macos-15-intel` will be the last x86_64 `macos` image supported by GHA.
+            # It will be available until Aug. 2027 (see https://github.com/actions/runner-images/issues/13045).
+            runner: macos-15-intel
           - target: x86_64-pc-windows-msvc
             type: native
             runner: windows-2022
diff --git a/.github/workflows/test-llvm-builder.yml b/.github/workflows/test-llvm-builder.yml
index b25f7e4f..ba3f3460 100644
--- a/.github/workflows/test-llvm-builder.yml
+++ b/.github/workflows/test-llvm-builder.yml
@@ -18,7 +18,7 @@ jobs:
   test:
     strategy:
       matrix:
-        runner: [parity-large, macos-14, windows-2022]
+        runner: [parity-large, macos-15, windows-2022]
     runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/checkout@v4
@@ -36,7 +36,7 @@ jobs:
           sudo apt update && sudo apt-get install -y cmake ninja-build curl git libssl-dev pkg-config clang lld musl
 
       - name: Install Dependencies
-        if: matrix.runner == 'macos-14'
+        if: matrix.runner == 'macos-15'
         run: |
           brew install ninja
 
diff --git a/.github/workflows/test-wasm.yml b/.github/workflows/test-wasm.yml
index 2a1769f4..96ff6606 100644
--- a/.github/workflows/test-wasm.yml
+++ b/.github/workflows/test-wasm.yml
@@ -68,7 +68,7 @@ jobs:
     needs: build
     strategy:
       matrix:
-        os: ["ubuntu-24.04", "macos-14", "windows-2022"]
+        os: ["ubuntu-24.04", "macos-15", "windows-2022"]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4