diff --git a/wireguard-install.sh b/wireguard-install.sh
index 5b779b7..cd12642 100644
--- a/wireguard-install.sh
+++ b/wireguard-install.sh
@@ -268,7 +268,7 @@ if [[ ! -e /etc/wireguard/wg0.conf ]]; then
 	fi
 	echo
 	echo "WireGuard installation is ready to begin."
-	# Install a firewall in the rare case where one is not already available
+	# Install a firewall if firewalld or iptables are not already available
 	if ! systemctl is-active --quiet firewalld.service && ! hash iptables 2>/dev/null; then
 		if [[ "$os" == "centos" || "$os" == "fedora" ]]; then
 			firewall="firewalld"
@@ -288,6 +288,10 @@ if [[ ! -e /etc/wireguard/wg0.conf ]]; then
 			# Ubuntu
 			apt-get update
 			apt-get install -y wireguard qrencode $firewall
+		elif [[ "$os" == "debian" && "$os_version" -ge 11 ]]; then
+			# Debian 11 or higher
+			apt-get update
+			apt-get install -y wireguard qrencode $firewall
 		elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
 			# Debian 10
 			if ! grep -qs '^deb .* buster-backports main' /etc/apt/sources.list /etc/apt/sources.list.d/*.list; then
@@ -330,6 +334,11 @@ if [[ ! -e /etc/wireguard/wg0.conf ]]; then
 			apt-get update
 			apt-get install -y qrencode ca-certificates $cron $firewall
 			apt-get install -y wireguard-tools --no-install-recommends
+		elif [[ "$os" == "debian" && "$os_version" -ge 11 ]]; then
+			# Debian 11 or higher
+			apt-get update
+			apt-get install -y qrencode ca-certificates $cron $firewall
+			apt-get install -y wireguard-tools --no-install-recommends
 		elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
 			# Debian 10
 			if ! grep -qs '^deb .* buster-backports main' /etc/apt/sources.list /etc/apt/sources.list.d/*.list; then
@@ -617,6 +626,10 @@ else
 						# Ubuntu
 						rm -rf /etc/wireguard/
 						apt-get remove --purge -y wireguard wireguard-tools
+					elif [[ "$os" == "debian" && "$os_version" -ge 11 ]]; then
+						# Debian 11 or higher
+						rm -rf /etc/wireguard/
+						apt-get remove --purge -y wireguard wireguard-tools
 					elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
 						# Debian 10
 						rm -rf /etc/wireguard/
@@ -640,6 +653,10 @@ else
 						# Ubuntu
 						rm -rf /etc/wireguard/
 						apt-get remove --purge -y wireguard-tools
+					elif [[ "$os" == "debian" && "$os_version" -ge 11 ]]; then
+						# Debian 11 or higher
+						rm -rf /etc/wireguard/
+						apt-get remove --purge -y wireguard-tools
 					elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
 						# Debian 10
 						rm -rf /etc/wireguard/