diff --git a/.github/workflows/build-and-test-differential-arm64.yaml b/.github/workflows/build-and-test-differential-arm64.yaml
index 9e121aa028867..40d7a8846d13b 100644
--- a/.github/workflows/build-and-test-differential-arm64.yaml
+++ b/.github/workflows/build-and-test-differential-arm64.yaml
@@ -76,7 +76,7 @@ jobs:
           target-packages: ${{ steps.get-modified-packages.outputs.modified-packages }}
           build-depends-repos: ${{ matrix.build-depends-repos }}
           cache-key-element: ${{ env.BUILD_TYPE_CUDA_STATE }}
-          build-pre-command: taskset --cpu-list 0-6
+          build-pre-command: taskset --cpu-list 0-5
 
       - name: Test
         id: test
diff --git a/.github/workflows/build-and-test-differential.yaml b/.github/workflows/build-and-test-differential.yaml
index cda1666603926..30619f7ef5aff 100644
--- a/.github/workflows/build-and-test-differential.yaml
+++ b/.github/workflows/build-and-test-differential.yaml
@@ -46,7 +46,7 @@ jobs:
             build-depends-repos: build_depends.repos
           - container-suffix: -cuda
             runner: codebuild-autoware-us-east-1-${{ github.run_id }}-${{ github.run_attempt }}-ubuntu-7.0-large
-            build-pre-command: taskset --cpu-list 0-6
+            build-pre-command: taskset --cpu-list 0-5
           - container-suffix: ""
             runner: ubuntu-latest
             build-pre-command: ""
diff --git a/.github/workflows/build-and-test.yaml b/.github/workflows/build-and-test.yaml
index 0f239cd328591..a79bb60fa2929 100644
--- a/.github/workflows/build-and-test.yaml
+++ b/.github/workflows/build-and-test.yaml
@@ -93,7 +93,7 @@ jobs:
           target-packages: ${{ steps.get-self-packages.outputs.self-packages }}
           build-depends-repos: ${{ matrix.build-depends-repos }}
           cache-key-element: ${{ env.BUILD_TYPE_CUDA_STATE }}
-          build-pre-command: taskset --cpu-list 0-6
+          build-pre-command: taskset --cpu-list 0-5
 
       - name: Show ccache stats after build
         run: du -sh ${CCACHE_DIR} && ccache -s