diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1f1de43..d191bc0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,6 +13,7 @@ on:
 env:
   COSIGN_EXPERIMENTAL: 1
   REGISTRY_IMAGE: zenjoy/ruby
+  DEBIAN: bullseye
 
 jobs:
   build:
@@ -22,6 +23,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby: ['3.0', '3.1']
+        os: [ubuntu-latest, ubuntu-22.04-arm]
         include:
           - os: ubuntu-latest
             platform: linux/amd64
@@ -120,7 +122,7 @@ jobs:
       - name: Upload digest
         uses: actions/upload-artifact@v4
         with:
-          name: digests-${{ matrix.ruby }}-${{ matrix.debian }}-${{ env.PLATFORM_PAIR }}
+          name: digests-${{ matrix.ruby }}-${{ env.DEBIAN }}-${{ env.PLATFORM_PAIR }}
           path: /tmp/digests/*
           if-no-files-found: error
           retention-days: 1
@@ -138,16 +140,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.0', '3.1', '3.2', '3.3']
-        debian: ['bookworm']
+        ruby: ['3.0', '3.1']
+
     needs:
       - build
+
     steps:
       - name: Download digests
         uses: actions/download-artifact@v4
         with:
           path: /tmp/digests
-          pattern: digests-${{ matrix.ruby }}-${{ matrix.debian }}-*
+          pattern: digests-${{ matrix.ruby }}-${{ env.DEBIAN }}-*
           merge-multiple: true
 
       - name: Parse ruby version