diff --git a/install.sh b/install.sh
index 60e84a8..a278db2 100755
--- a/install.sh
+++ b/install.sh
@@ -27,6 +27,11 @@ set -e
 # Ask for sudo password upfront so subsequent sudo calls don't prompt mid-install
 sudo -v
 
+# Grant passwordless sudo for the duration of the install, revoke on exit
+echo "$USER ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/99-hampack-install > /dev/null
+sudo chmod 440 /etc/sudoers.d/99-hampack-install
+trap "sudo rm -f /etc/sudoers.d/99-hampack-install" EXIT
+
 # Ensure git is available before attempting to clone anything
 if ! command -v git &> /dev/null; then
   echo "Installing git..."