diff --git a/action.yml b/action.yml
index 6975cac..2327249 100644
--- a/action.yml
+++ b/action.yml
@@ -12,9 +12,7 @@ runs:
   using: 'composite'
   steps:
   - uses: actions/checkout@${{ inputs.checkout_version }}
-    shell: bash
   - uses: https://gitea.jsc.idv.tw/actions/cache-nuget@${{ inputs.cache_nuget_version }}
-    shell: bash
   - run: dotnet restore
     shell: bash
   - run: dotnet build --no-restore