diff --git a/api/shop_class.lua b/api/shop_class.lua
index 283b931..e096650 100644
--- a/api/shop_class.lua
+++ b/api/shop_class.lua
@@ -258,6 +258,7 @@ function shop_class:log_purchase(player, i, mechanic)
 	end
 
 	self.meta:set_string("purchase_history", minetest.serialize(history))
+	self.meta:mark_as_private("purchase_history")
 end
 
 --------------------
diff --git a/compat/old_smartshops.lua b/compat/old_smartshops.lua
index 8a667f8..15ad289 100644
--- a/compat/old_smartshops.lua
+++ b/compat/old_smartshops.lua
@@ -146,3 +146,14 @@ if smartshop.settings.enable_refund then
 		end,
 	})
 end
+
+-- we forgot to mark purchase history as private originally, so go through old shops and fix that
+minetest.register_lbm({
+	name = "smartshop:privatise_purchase_history",
+	nodenames = { "group:smartshop" },
+	run_at_every_load = false,
+	action = function(pos, node)
+		local shop = api.get_object(pos)
+		shop.meta:mark_as_private("purchase_history")
+	end,
+})
diff --git a/mod.conf b/mod.conf
index 5b8f377..2145c57 100644
--- a/mod.conf
+++ b/mod.conf
@@ -6,6 +6,7 @@ author = fluxionary
 license = LGPL-3.0-or-later
 media_license = CC-BY-SA-3.0
 version = 2023-05-18
-min_minetest_version = 5.6.1
+min_minetest_version = 5.7.0
+supported_games = *
 depends = fmod, futil
 optional_depends = currency, default, mesecons, mesecons_mvps, petz, node_entity_queue, pipeworks, tubelib