diff --git a/bin/setup b/bin/setup
index 90d68e323..61ab69995 100755
--- a/bin/setup
+++ b/bin/setup
@@ -62,6 +62,9 @@ if which pacman >/dev/null 2>&1; then
   fi
 fi
 
+# Ensure gh-signoff is installed and up to date
+step "Set up gh-signoff" bash -c "gh extension install basecamp/gh-signoff || gh extension upgrade basecamp/gh-signoff"
+
 bundle config set --local auto_install true
 step "Installing RubyGems" bundle install