diff --git a/ref/upgrade_bash.sh b/ref/upgrade_bash.sh
index f3eaa32..c9ac575 100644
--- a/ref/upgrade_bash.sh
+++ b/ref/upgrade_bash.sh
@@ -24,7 +24,7 @@ upgrade_bash() {
     else
         if [ -f /etc/os-release ]; then
             . /etc/os-release
-            if [ $(id -u) -ne 0 ] && ! command -v sudo >/dev/null 2>&1; then
+            if [ $(id -u) -ne 0 ] && ! sudo -v >/dev/null 2>&1; then
                 echo "Error: You need sudo privileges to upgrade Bash."
                 exit 1
             fi