diff --git a/diff-sha.sh b/diff-sha.sh
index 20a613d0..4a78fd92 100644
--- a/diff-sha.sh
+++ b/diff-sha.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -eu
+set -euo pipefail
 
 INITIAL_COMMIT="false"
 GITHUB_OUTPUT=${GITHUB_OUTPUT:-""}