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/src/back8sup.sh b/src/back8sup.sh
index 847ae82..17dfebf 100755
--- a/src/back8sup.sh
+++ b/src/back8sup.sh
@@ -151,4 +151,5 @@ done
 log "INFO done exporting namespace $NS"
 
 log "INFO keep last $GENERATIONS backups and delete the rest"
-ls -t -w 1 "$DST_FOLDER/" | tail -n +$GENERATIONS | xargs rm -rf
+# shellcheck disable=SC2012
+ls -t -w 1 "$DST_FOLDER/" | tail -n +"$GENERATIONS" | xargs rm -rf