diff --git a/.bazelrc b/.bazelrc
index c8b8682c4b..c58667b46e 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -214,6 +214,8 @@ common --@v8//:v8_enable_sandbox=True
 # artifact migration ships matching Rust feature selection for Cargo consumers.
 common:v8-release-compat --@v8//:v8_enable_pointer_compression=False
 common:v8-release-compat --@v8//:v8_enable_sandbox=False
+common:v8-target-x64 --@v8//bazel/config:v8_target_cpu=x64
+common:v8-target-arm64 --@v8//bazel/config:v8_target_cpu=arm64
 
 # Match rusty_v8's upstream GN release contract for published artifacts: every
 # target object uses Chromium's custom libc++ headers and the archive folds in
diff --git a/.github/workflows/rusty-v8-release.yml b/.github/workflows/rusty-v8-release.yml
index d6fb73e96d..71f3abf3a4 100644
--- a/.github/workflows/rusty-v8-release.yml
+++ b/.github/workflows/rusty-v8-release.yml
@@ -73,72 +73,84 @@ jobs:
             platform: linux_amd64
             sandbox: false
             target: x86_64-unknown-linux-gnu
+            v8_cpu: x64
             variant: release
           - runner: ubuntu-24.04
             bazel_config: ci-v8
             platform: linux_amd64
             sandbox: true
             target: x86_64-unknown-linux-gnu
+            v8_cpu: x64
             variant: ptrcomp-sandbox
           - runner: ubuntu-24.04-arm
             bazel_config: ci-v8
             platform: linux_arm64
             sandbox: false
             target: aarch64-unknown-linux-gnu
+            v8_cpu: arm64
             variant: release
           - runner: ubuntu-24.04-arm
             bazel_config: ci-v8
             platform: linux_arm64
             sandbox: true
             target: aarch64-unknown-linux-gnu
+            v8_cpu: arm64
             variant: ptrcomp-sandbox
           - runner: macos-15-xlarge
             bazel_config: ci-macos
             platform: macos_amd64
             sandbox: false
             target: x86_64-apple-darwin
+            v8_cpu: x64
             variant: release
           - runner: macos-15-xlarge
             bazel_config: ci-macos
             platform: macos_amd64
             sandbox: true
             target: x86_64-apple-darwin
+            v8_cpu: x64
             variant: ptrcomp-sandbox
           - runner: macos-15-xlarge
             bazel_config: ci-macos
             platform: macos_arm64
             sandbox: false
             target: aarch64-apple-darwin
+            v8_cpu: arm64
             variant: release
           - runner: macos-15-xlarge
             bazel_config: ci-macos
             platform: macos_arm64
             sandbox: true
             target: aarch64-apple-darwin
+            v8_cpu: arm64
             variant: ptrcomp-sandbox
           - runner: ubuntu-24.04
             bazel_config: ci-v8
             platform: linux_amd64_musl
             sandbox: false
             target: x86_64-unknown-linux-musl
+            v8_cpu: x64
             variant: release
           - runner: ubuntu-24.04-arm
             bazel_config: ci-v8
             platform: linux_arm64_musl
             sandbox: false
             target: aarch64-unknown-linux-musl
+            v8_cpu: arm64
             variant: release
           - runner: ubuntu-24.04
             bazel_config: ci-v8
             platform: linux_amd64_musl
             sandbox: true
             target: x86_64-unknown-linux-musl
+            v8_cpu: x64
             variant: ptrcomp-sandbox
           - runner: ubuntu-24.04-arm
             bazel_config: ci-v8
             platform: linux_arm64_musl
             sandbox: true
             target: aarch64-unknown-linux-musl
+            v8_cpu: arm64
             variant: ptrcomp-sandbox
 
     steps:
@@ -167,6 +179,7 @@ jobs:
           PLATFORM: ${{ matrix.platform }}
           SANDBOX: ${{ matrix.sandbox }}
           TARGET: ${{ matrix.target }}
+          V8_CPU: ${{ matrix.v8_cpu }}
         shell: bash
         run: |
           set -euo pipefail
@@ -184,6 +197,7 @@ jobs:
             opt
             "--platforms=@llvm//platforms:${PLATFORM}"
             --config=rusty-v8-upstream-libcxx
+            "--config=v8-target-${V8_CPU}"
             "${pair_target}"
             --build_metadata=COMMIT_SHA=$(git rev-parse HEAD)
           )
@@ -203,6 +217,7 @@ jobs:
           PLATFORM: ${{ matrix.platform }}
           SANDBOX: ${{ matrix.sandbox }}
           TARGET: ${{ matrix.target }}
+          V8_CPU: ${{ matrix.v8_cpu }}
         shell: bash
         run: |
           set -euo pipefail
@@ -213,6 +228,7 @@ jobs:
             --compilation-mode opt
             --output-dir "dist/${TARGET}"
             --bazel-config "${BAZEL_CONFIG}"
+            --bazel-config "v8-target-${V8_CPU}"
           )
           if [[ "${SANDBOX}" == "true" ]]; then
             stage_args+=(--sandbox)
diff --git a/.github/workflows/v8-canary.yml b/.github/workflows/v8-canary.yml
index 0ad9f850d1..c590dec00f 100644
--- a/.github/workflows/v8-canary.yml
+++ b/.github/workflows/v8-canary.yml
@@ -89,72 +89,84 @@ jobs:
             platform: linux_amd64
             sandbox: false
             target: x86_64-unknown-linux-gnu
+            v8_cpu: x64
             variant: release
           - runner: ubuntu-24.04
             bazel_config: ci-v8
             platform: linux_amd64
             sandbox: true
             target: x86_64-unknown-linux-gnu
+            v8_cpu: x64
             variant: ptrcomp-sandbox
           - runner: ubuntu-24.04-arm
             bazel_config: ci-v8
             platform: linux_arm64
             sandbox: false
             target: aarch64-unknown-linux-gnu
+            v8_cpu: arm64
             variant: release
           - runner: ubuntu-24.04-arm
             bazel_config: ci-v8
             platform: linux_arm64
             sandbox: true
             target: aarch64-unknown-linux-gnu
+            v8_cpu: arm64
             variant: ptrcomp-sandbox
           - runner: macos-15-xlarge
             bazel_config: ci-macos
             platform: macos_amd64
             sandbox: false
             target: x86_64-apple-darwin
+            v8_cpu: x64
             variant: release
           - runner: macos-15-xlarge
             bazel_config: ci-macos
             platform: macos_amd64
             sandbox: true
             target: x86_64-apple-darwin
+            v8_cpu: x64
             variant: ptrcomp-sandbox
           - runner: macos-15-xlarge
             bazel_config: ci-macos
             platform: macos_arm64
             sandbox: false
             target: aarch64-apple-darwin
+            v8_cpu: arm64
             variant: release
           - runner: macos-15-xlarge
             bazel_config: ci-macos
             platform: macos_arm64
             sandbox: true
             target: aarch64-apple-darwin
+            v8_cpu: arm64
             variant: ptrcomp-sandbox
           - runner: ubuntu-24.04
             bazel_config: ci-v8
             platform: linux_amd64_musl
             sandbox: false
             target: x86_64-unknown-linux-musl
+            v8_cpu: x64
             variant: release
           - runner: ubuntu-24.04
             bazel_config: ci-v8
             platform: linux_amd64_musl
             sandbox: true
             target: x86_64-unknown-linux-musl
+            v8_cpu: x64
             variant: ptrcomp-sandbox
           - runner: ubuntu-24.04-arm
             bazel_config: ci-v8
             platform: linux_arm64_musl
             sandbox: false
             target: aarch64-unknown-linux-musl
+            v8_cpu: arm64
             variant: release
           - runner: ubuntu-24.04-arm
             bazel_config: ci-v8
             platform: linux_arm64_musl
             sandbox: true
             target: aarch64-unknown-linux-musl
+            v8_cpu: arm64
             variant: ptrcomp-sandbox
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -183,6 +195,7 @@ jobs:
           PLATFORM: ${{ matrix.platform }}
           SANDBOX: ${{ matrix.sandbox }}
           TARGET: ${{ matrix.target }}
+          V8_CPU: ${{ matrix.v8_cpu }}
         shell: bash
         run: |
           set -euo pipefail
@@ -198,6 +211,7 @@ jobs:
             build
             "--platforms=@llvm//platforms:${PLATFORM}"
             --config=rusty-v8-upstream-libcxx
+            "--config=v8-target-${V8_CPU}"
             "${pair_target}"
             --build_metadata=COMMIT_SHA=$(git rev-parse HEAD)
           )
@@ -217,6 +231,7 @@ jobs:
           PLATFORM: ${{ matrix.platform }}
           SANDBOX: ${{ matrix.sandbox }}
           TARGET: ${{ matrix.target }}
+          V8_CPU: ${{ matrix.v8_cpu }}
         shell: bash
         run: |
           set -euo pipefail
@@ -226,6 +241,7 @@ jobs:
             --target "${TARGET}"
             --output-dir "dist/${TARGET}"
             --bazel-config "${BAZEL_CONFIG}"
+            --bazel-config "v8-target-${V8_CPU}"
           )
           if [[ "${SANDBOX}" == "true" ]]; then
             stage_args+=(--sandbox)