diff --git a/.github/workflows/shellcheck.yaml b/.github/workflows/shellcheck.yaml
index 6c445a5..56ebf79 100644
--- a/.github/workflows/shellcheck.yaml
+++ b/.github/workflows/shellcheck.yaml
@@ -8,4 +8,4 @@ jobs:
         uses: actions/checkout@v2
       - name: Run shellcheck
         id: shellcheck
-        uses: ludeeus/action-shellcheck@0.1.0
+        uses: ludeeus/action-shellcheck@1.1.0
diff --git a/backup.sh b/backup.sh
index 2d845b8..0d76465 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 ################################################################################
 # backup.sh OpenShift etcd backup script
 ################################################################################
@@ -70,5 +70,6 @@ rm -rv /host/var/tmp/etcd-backup
 if [ "${OCP_BACKUP_EXPIRE_TYPE}" = "days" ]; then
   find "${BACKUP_ROOTPATH}" -mindepth 1 -maxdepth 1  -type d -mtime "+${OCP_BACKUP_KEEP_DAYS}" -exec rm -rv {} +
 elif [ "${OCP_BACKUP_EXPIRE_TYPE}" = "count" ]; then
+  # shellcheck disable=SC3040,SC2012
   ls -1tp "${BACKUP_ROOTPATH}" | awk "NR>${OCP_BACKUP_KEEP_COUNT}" | xargs -I{} rm -rv "${BACKUP_ROOTPATH}/{}"
 fi