diff --git a/bin/homedir-gems b/bin/homedir-gems
new file mode 100755
--- /dev/null
+++ b/bin/homedir-gems
@@ -0,0 +1,11 @@
+#!/bin/sh
+set -eu
+
+GEMS="pry git-up"
+
+if which pry >/dev/null; then
+  gem update $GEMS
+else
+  gem install $GEMS
+fi
+