diff --git a/src/main.cpp b/src/main.cpp
index 7c71ae7..ce694a9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -19,6 +19,7 @@
 #include <wrenpp/vm_fun.hpp>
 #include <wrenpp/def_configuration.hpp>
 #include <wrenpp/callback_manager.hpp>
+#include <wrenpp/class_manager.hpp>
 #include <utility>
 #include <algorithm>
 
@@ -89,17 +90,6 @@ void exchange_ticker_price_bitcoinity_wren (wren::VM& vm) {
 
 class MyWrenConfiguration : public wren::DefConfiguration {
 public:
-	wren::foreign_class_t foreign_class_fn(
-		wren::VM* vm,
-		std::string_view module,
-		std::string_view class_name
-	) {
-		if (module == "ticker_price" and class_name == "TickerPrice")
-			return wren::make_foreign_class<duck::TickerPrice>();
-		else
-			return {nullptr, nullptr};
-	}
-
 	char* load_module_fn(wren::VM* vm, std::string_view module_name) {
 		std::string_view wren_code;
 
@@ -132,6 +122,8 @@ int main() {
 		.add_callback(false, "ticker_price", "TickerPrice", "currency", wren::make_method_bindable<&TickerPrice::currency>())
 		.add_callback(false, "ticker_price", "TickerPrice", "is_valid", wren::make_method_bindable<&TickerPrice::is_valid>())
 		.add_callback(false, "ticker_price", "TickerPrice", "exchange", wren::make_method_bindable<&TickerPrice::exchange>());
+	vm.class_manager()
+		.add_class_maker("ticker_price", "TickerPrice", &wren::make_foreign_class<duck::TickerPrice>);
 
 	vm.interpret("main", g_script);
 	wren::call<void>(vm, {"main", "the_app"}, "start");
diff --git a/subprojects/wrenpp b/subprojects/wrenpp
index d985ebc..258237c 160000
--- a/subprojects/wrenpp
+++ b/subprojects/wrenpp
@@ -1 +1 @@
-Subproject commit d985ebc417f80c59fe26200a9e1e677f54ccb9e9
+Subproject commit 258237cbf3b070f31defd5d5976bb96277ac9f65