diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 27b70242..cd9a8a8f 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -128,11 +128,26 @@ jobs:
           path: dist
 
   linux:
-    runs-on: ubicloud-standard-4
+    runs-on: ${{ matrix.platform.os }}
     strategy:
       matrix:
+        platform:
+          - os: ubicloud-standard-2
+            target: x86_64
+          - os: ubicloud-standard-2
+            target: i686
+          - os: ubicloud-standard-2-arm
+            target: aarch64
         python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
-        target: [x86_64, i686]
+        include:
+          - platform:
+              os: ubicloud-standard-2-arm
+              target: aarch64
+            python-version: pypy3.9
+          - platform:
+              os: ubicloud-standard-2-arm
+              target: aarch64
+            python-version: pypy3.10
     steps:
     - uses: actions/checkout@v3
     - uses: actions/cache@v3
@@ -143,7 +158,7 @@ jobs:
           ~/.cargo/registry/cache/
           ~/.cargo/git/db/
           target/
-        key: ${{ runner.os }}-${{ matrix.target }}-${{ matrix.python-version }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+        key: ${{ runner.os }}-${{ matrix.platform.target }}-${{ matrix.python-version }}-cargo-${{ hashFiles('**/Cargo.lock') }}
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable
     - name: Tests
@@ -156,22 +171,22 @@ jobs:
     - name: Build Wheels - cramjam-python
       uses: PyO3/maturin-action@v1
       with:
-        target: ${{ matrix.target }}
+        target: ${{ matrix.platform.target }}
         manylinux: auto
         args: -i ${{ matrix.python-version }} --release --out dist --manifest-path cramjam-python/Cargo.toml
     - name: Build Wheels - cramjam-cli
       uses: PyO3/maturin-action@v1
       with:
-        target: ${{ matrix.target }}
+        target: ${{ matrix.platform.target }}
         manylinux: auto
         args: -i ${{ matrix.python-version }} --release --out dist --manifest-path cramjam-cli/Cargo.toml
     - name: Python UnitTest - cramjam-python
-      if: matrix.target == 'x86_64'
+      if: matrix.platform.target == 'x86_64'
       run: |
         pip install cramjam[dev] --find-links dist --force-reinstall
         python -m pytest cramjam-python -vs --ignore **/benchmarks
     - name: Python UnitTest - cramjam-cli
-      if: matrix.target == 'x86_64'
+      if: matrix.platform.target == 'x86_64'
       run: |
         pip install cramjam-cli --no-index --find-links dist --force-reinstall
         python -m pytest cramjam-cli -vs --ignore **/benchmarks
@@ -182,7 +197,7 @@ jobs:
         path: dist
 
   linux-cross:
-    runs-on: ubicloud-standard-4
+    runs-on: ubicloud-standard-2
     strategy:
       matrix:
         python:
@@ -192,12 +207,7 @@ jobs:
           - '3.10'
           - '3.11'
           - '3.12'
-        target: [aarch64, armv7, s390x, ppc64le]
-        include:
-          - python: pypy3.9
-            target: aarch64
-          - python: pypy3.10
-            target: aarch64
+        target: [armv7, s390x, ppc64le]
     steps:
     - uses: actions/checkout@v3
     - uses: actions/cache@v3
@@ -259,7 +269,7 @@ jobs:
       fail-fast: false
       matrix:
         platform:
-          - os: ubicloud-standard-4
+          - os: ubicloud-standard-2
             flags: ''
           - os: macos-13
             flags: ''