diff --git a/setup.sh b/setup.sh
index 93cb02a..87f51c8 100644
--- a/setup.sh
+++ b/setup.sh
@@ -229,8 +229,7 @@ if [ "$PKG_MANAGER" == "apt" ]; then
     # sudo apt-get remove --purge -y dnsmasq || true # This line is no longer needed.
 
     # Install dependencies for hotspot and for building nodogsplash.
-    # ifupdown is needed to manage /etc/network/interfaces
-    sudo apt install -y hostapd dnsmasq git libmicrohttpd-dev libjson-c-dev iptables ifupdown
+    sudo apt install -y hostapd dnsmasq git libmicrohttpd-dev libjson-c-dev iptables
     
     # Force iptables-legacy for nodogsplash
     echo "Setting iptables-legacy mode for nodogsplash..."
@@ -295,34 +294,22 @@ EOF
 sudo rm -f /etc/NetworkManager/conf.d/99-disable-dns.conf
 sudo systemctl reload NetworkManager
 
-# --- Configure networking for AP mode (using /etc/network/interfaces) ---
+# Configure a static IP for wlan0 using dhcpcd.
+echo "Configuring static IP for wlan0 via dhcpcd..."
+# Ensure dhcpcd is installed
+sudo apt install -y dhcpcd5
 
-# 1. Uninstall dhcpcd5 to prevent any conflicts.
-echo "Removing dhcpcd5 to switch to /etc/network/interfaces..."
-sudo apt-get remove --purge -y dhcpcd5 || true
-sudo systemctl disable dhcpcd || true
+# First, remove any existing configurations for wlan0 to prevent conflicts.
+# This is a more robust way to ensure our settings are applied.
+sudo sed -i '/^interface wlan0/,/^\s*$/d' /etc/dhcpcd.conf
 
-# 2. Configure a static IP for wlan0 directly in the interfaces file.
-echo "Configuring static IP for wlan0 via /etc/network/interfaces..."
-sudo tee /etc/network/interfaces > /dev/null <<EOF
-# This file describes the network interfaces available on your system
-# and how to activate them. For more information, see interfaces(5).
+# Now, add our static IP config to the end of the file.
+sudo tee -a /etc/dhcpcd.conf > /dev/null <<EOF
 
-source /etc/network/interfaces.d/*
-
-# The loopback network interface
-auto lo
-iface lo inet loopback
-
-# The primary network interface (Ethernet) - managed by NetworkManager
-allow-hotplug eth0
-iface eth0 inet dhcp
-
-# Static IP configuration for Fetch-Hachi AP
-allow-hotplug wlan0
-iface wlan0 inet static
-    address 10.0.252.1
-    netmask 255.255.255.0
+# Static IP configuration for Hachi Time AP
+interface wlan0
+    static ip_address=10.0.252.1/24
+    nohook wpa_supplicant
 EOF
 
 # Configure hostapd for the Access Point
@@ -387,11 +374,8 @@ echo "Disabling systemd-resolved to ensure dnsmasq has full control..."
 sudo systemctl stop systemd-resolved || true
 sudo systemctl disable systemd-resolved || true
 
-# Bring up the wlan0 interface manually
-echo "Bringing up wlan0 interface..."
-sudo ifdown wlan0 || true
-sudo ifup wlan0
-
+# Restart dhcpcd to apply the static IP
+sudo systemctl restart dhcpcd
 # Restart hostapd to create the access point
 sudo systemctl restart hostapd
 
@@ -442,7 +426,7 @@ if [ "$IP_CHECK" == "10.0.252.1" ]; then
     fi
 else
     echo "❌ Error: wlan0 failed to get the static IP 10.0.252.1. Found: '$IP_CHECK'."
-    echo "Please check 'sudo systemctl status hostapd' and 'cat /etc/network/interfaces'."
+    echo "Please check 'sudo systemctl status hostapd' and 'sudo systemctl status dhcpcd'."
     exit 1
 fi