diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 01e7d75..d397c93 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,6 +22,11 @@ env:
   DOTNET_NOLOGO: "1"
   DOTNET_CLI_TELEMETRY_OPTOUT: "1"
 
+defaults:
+  run:
+    # Explicit bash adds -o pipefail, so `cmd | tee` keeps cmd's exit code.
+    shell: bash
+
 jobs:
   verify:
     # Required check name. Keep it exactly `verify`.