diff --git a/.update.sh b/.update.sh
index ac220ef..f0b3ad9 100755
--- a/.update.sh
+++ b/.update.sh
@@ -20,7 +20,7 @@ export DEBIAN_FRONTEND=noninteractive
 
 ADJUSTED_ID="None"
 
-NON_ROOT_USER=$(logname 2>/dev/null || echo "nobody")
+NON_ROOT_USER=$(id -un 2>/dev/null || echo "nobody")
 
 ###################################################################################################
 # Functions
@@ -236,7 +236,7 @@ update_brew() {
 
     # Safely drop privileges back to the normal user to run brew commands
     if [ "${NON_ROOT_USER}" != "nobody" ] && [ "${NON_ROOT_USER}" != "root" ]; then
-        if ! su - "${NON_ROOT_USER}" -s /bin/sh -c "${_brew_cmds}"; then
+        if ! su - "${NON_ROOT_USER}" -c "${_brew_cmds}"; then
             print_err "Error: Brew commands failed for user ${NON_ROOT_USER}."
             return
         fi