diff --git a/.github/workflows/CI_ecosystem.yml b/.github/workflows/CI_ecosystem.yml
index 848e9dc2..1f7c0819 100644
--- a/.github/workflows/CI_ecosystem.yml
+++ b/.github/workflows/CI_ecosystem.yml
@@ -25,7 +25,7 @@ jobs:
           - macos-latest
           - windows-latest
         arch:
-          - x64
+          - default
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v3
diff --git a/.github/workflows/CI_extended.yml b/.github/workflows/CI_extended.yml
index c5b967a0..7a6dbffa 100644
--- a/.github/workflows/CI_extended.yml
+++ b/.github/workflows/CI_extended.yml
@@ -25,7 +25,7 @@ jobs:
           - macos-latest
           - windows-latest
         arch:
-          - x64
+          - default
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v3