diff --git a/gframe/Android/COSAndroidOperator.cpp b/gframe/Android/COSAndroidOperator.cpp
index d0589d065..a102488f5 100644
--- a/gframe/Android/COSAndroidOperator.cpp
+++ b/gframe/Android/COSAndroidOperator.cpp
@@ -6,7 +6,6 @@
 
 #include <sys/utsname.h>
 #include <android/api-level.h>
-#include <fmt/format.h>
 #include "COSAndroidOperator.h"
 #include "porting_android.h"
 
@@ -19,7 +18,7 @@ COSAndroidOperator::COSAndroidOperator() {
 #endif
 	struct utsname LinuxInfo;
 	uname(&LinuxInfo);
-	const auto verstring = fmt::format("Android version: {} {} {} {} {}",
+	const auto verstring = epro::format("Android version: {} {} {} {} {}",
 									   android_get_device_api_level(), LinuxInfo.sysname, LinuxInfo.release, LinuxInfo.version, LinuxInfo.machine);
 	OperatingSystem = { verstring.data(), (u32)verstring.size() };
 }
diff --git a/gframe/CGUITTFont/CGUITTFont.cpp b/gframe/CGUITTFont/CGUITTFont.cpp
index e458b48bb..1b6205035 100644
--- a/gframe/CGUITTFont/CGUITTFont.cpp
+++ b/gframe/CGUITTFont/CGUITTFont.cpp
@@ -454,7 +454,7 @@ CGUITTGlyphPage* CGUITTFont::getLastGlyphPage() const {
 
 CGUITTGlyphPage* CGUITTFont::createGlyphPage(const u8& pixel_mode) {
 	// Name of our page.
-	auto name = fmt::format("TTFontGlyphPage_{}.{}.{}._{}",
+	auto name = epro::format("TTFontGlyphPage_{}.{}.{}._{}",
 							tt_face->family_name, tt_face->style_name, size, Glyph_Pages.size()); // The newly created page will be at the end of the collection.
 
 	// Create the new page.
diff --git a/gframe/address.cpp b/gframe/address.cpp
index 7b6aed952..d7a0ec483 100644
--- a/gframe/address.cpp
+++ b/gframe/address.cpp
@@ -78,7 +78,7 @@ Host Host::resolve(epro::stringview address, uint16_t port) {
 		hints.ai_flags = EVUTIL_AI_ADDRCONFIG;
 		auto getAddrInfo = [&](auto ai_family) {
 			hints.ai_family = ai_family;
-			return evutil_getaddrinfo(address.data(), fmt::to_string(port).data(), &hints, &answer) == 0;
+			return evutil_getaddrinfo(address.data(), epro::to_string(port).data(), &hints, &answer) == 0;
 		};
 		//Give priority to ipv4 addresses
 		if(getAddrInfo(AF_INET)) {
diff --git a/gframe/client_card.cpp b/gframe/client_card.cpp
index 6d8a9e2b0..3a314cc6f 100644
--- a/gframe/client_card.cpp
+++ b/gframe/client_card.cpp
@@ -52,7 +52,7 @@ void ClientCard::UpdateInfo(const CoreUtils::Query& query) {
 			if(attack < 0) {
 				atkstring = L"?";
 			} else
-				atkstring = fmt::to_wstring(attack);
+				atkstring = epro::to_wstring(attack);
 		}
 	}
 	if(query.flag & QUERY_DEFENSE) {
@@ -60,7 +60,7 @@ void ClientCard::UpdateInfo(const CoreUtils::Query& query) {
 			if(defense < 0) {
 				defstring = L"?";
 			} else
-				defstring = fmt::to_wstring(defense);
+				defstring = epro::to_wstring(defense);
 		}
 	}
 	/*if(query.flag & QUERY_REASON_CARD) {
@@ -100,11 +100,11 @@ void ClientCard::UpdateInfo(const CoreUtils::Query& query) {
 	}
 	if(query.flag & QUERY_LSCALE) {
 		if(IsDifferent(lscale, query.lscale) || lscstring.empty())
-			lscstring = fmt::to_wstring(lscale);
+			lscstring = epro::to_wstring(lscale);
 	}
 	if(query.flag & QUERY_RSCALE) {
 		if(IsDifferent(rscale, query.rscale) || rscstring.empty())
-			rscstring = fmt::to_wstring(rscale);
+			rscstring = epro::to_wstring(rscale);
 	}
 	if(query.flag & QUERY_LINK) {
 		if(IsDifferent(link, query.link) || linkstring.empty())
diff --git a/gframe/client_field.cpp b/gframe/client_field.cpp
index e82e7e87a..cc239157d 100644
--- a/gframe/client_field.cpp
+++ b/gframe/client_field.cpp
@@ -427,7 +427,7 @@ void ClientField::ShowSelectCard(bool buttonok, bool chain) {
 			}
 		} else {
 			if(sort_list[i]) {
-				curstring->setText(fmt::to_wstring(sort_list[i]).data());
+				curstring->setText(epro::to_wstring(sort_list[i]).data());
 			} else
 				curstring->setText(L"");
 			curstring->setBackgroundColor(skin::DUELFIELD_CARD_SELF_WINDOW_BACKGROUND_VAL);
diff --git a/gframe/data_manager.cpp b/gframe/data_manager.cpp
index ee48e342d..c382efeab 100644
--- a/gframe/data_manager.cpp
+++ b/gframe/data_manager.cpp
@@ -410,7 +410,7 @@ std::vector<uint16_t> DataManager::GetSetCode(const std::vector<epro::wstringvie
 }
 std::wstring DataManager::GetNumString(size_t num, bool bracket) const {
 	if(!bracket)
-		return fmt::to_wstring(num);
+		return epro::to_wstring(num);
 	return epro::format(L"({})", num);
 }
 
diff --git a/gframe/deck_con.cpp b/gframe/deck_con.cpp
index 6a570aa51..c0e4eb1de 100644
--- a/gframe/deck_con.cpp
+++ b/gframe/deck_con.cpp
@@ -1151,7 +1151,7 @@ void DeckBuilder::FilterCards(bool force_refresh) {
 	SortList();
 	auto ip = std::unique(results.begin(), results.end());
 	results.resize(std::distance(results.begin(), ip));
-	result_string = fmt::to_wstring(results.size());
+	result_string = epro::to_wstring(results.size());
 	scroll_pos = 0;
 	if(results.size() > 7) {
 		mainGame->scrFilter->setVisible(true);
diff --git a/gframe/deck_manager.cpp b/gframe/deck_manager.cpp
index 93a23bf29..d835dcb2e 100644
--- a/gframe/deck_manager.cpp
+++ b/gframe/deck_manager.cpp
@@ -419,7 +419,7 @@ bool DeckManager::SaveDeck(epro::path_stringview name, const Deck& deck) {
 	deckfile << "#created by " << BufferIO::EncodeUTF8(mainGame->ebNickName->getText()) << "\n#main\n";
 	auto serializeDeck = [&deckfile](const auto& deck) {
 		for(auto card : deck)
-			deckfile << fmt::to_string(card->getRealCode()) << "\n";
+			deckfile << epro::to_string(card->getRealCode()) << "\n";
 	};
 	serializeDeck(deck.main);
 	deckfile << "#extra\n";
@@ -435,13 +435,13 @@ bool DeckManager::SaveDeck(epro::path_stringview name, const cardlist_type& main
 		return false;
 	deckfile << "#created by " << BufferIO::EncodeUTF8(mainGame->ebNickName->getText()) << "\n#main\n";
 	for(auto card : mainlist)
-		deckfile << fmt::to_string(card) << "\n";
+		deckfile << epro::to_string(card) << "\n";
 	deckfile << "#extra\n";
 	for(auto card : extralist)
-		deckfile << fmt::to_string(card) << "\n";
+		deckfile << epro::to_string(card) << "\n";
 	deckfile << "!side\n";
 	for(auto card : sidelist)
-		deckfile << fmt::to_string(card) << "\n";
+		deckfile << epro::to_string(card) << "\n";
 	return true;
 }
 const wchar_t* DeckManager::ExportDeckBase64(const Deck& deck) {
diff --git a/gframe/discord_wrapper.cpp b/gframe/discord_wrapper.cpp
index 858343181..2bc94b67f 100644
--- a/gframe/discord_wrapper.cpp
+++ b/gframe/discord_wrapper.cpp
@@ -59,7 +59,7 @@ void DiscordWrapper::UpdatePresence(PresenceType type) {
 			// a->address
 			// p->port
 			// s->password
-			auto ret = fmt::format_to_n(secret_buf, sizeof(secret_buf) - 1, R"({{"i":{},"a":"{}","p":{},"s":"{}"}})",
+			auto ret = epro::format_to_n(secret_buf, sizeof(secret_buf) - 1, R"({{"i":{},"a":"{}","p":{},"s":"{}"}})",
 							 secret.game_id, secret.host.address, secret.host.port, BufferIO::EncodeUTF8(secret.pass));
 			*ret.out = '\0';
 		}
diff --git a/gframe/drawing.cpp b/gframe/drawing.cpp
index ff2e8395f..97fcba5f7 100644
--- a/gframe/drawing.cpp
+++ b/gframe/drawing.cpp
@@ -559,7 +559,7 @@ void Game::DrawMisc() {
 
 	if(lpframe > 0 && delta_frames) {
 		dInfo.lp[lpplayer] -= lpd * delta_frames;
-		dInfo.strLP[lpplayer] = fmt::to_wstring(std::max(0, dInfo.lp[lpplayer]));
+		dInfo.strLP[lpplayer] = epro::to_wstring(std::max(0, dInfo.lp[lpplayer]));
 		lpcalpha -= 0x19 * delta_frames;
 		lpframe -= delta_frames;
 	}
@@ -1251,7 +1251,7 @@ void Game::DrawDeckBd() {
 	const auto GetDeckSizeStr = [&](const Deck::Vector& deck, const Deck::Vector& pre_deck)->std::wstring {
 		if(is_siding)
 			return epro::format(L"{} ({})", deck.size(), pre_deck.size());
-		return fmt::to_wstring(deck.size());
+		return epro::to_wstring(deck.size());
 	};
 	const auto& current_deck = deckBuilder.GetCurrentDeck();
 
diff --git a/gframe/duelclient.cpp b/gframe/duelclient.cpp
index 4e7b2cda3..6a77638f8 100644
--- a/gframe/duelclient.cpp
+++ b/gframe/duelclient.cpp
@@ -1667,8 +1667,8 @@ int DuelClient::ClientAnalyze(const uint8_t* msg, uint32_t len) {
 			mainGame->dInfo.startlp = mainGame->dInfo.lp[mainGame->LocalPlayer(0)];
 		else
 			mainGame->dInfo.startlp = 8000;
-		mainGame->dInfo.strLP[0] = fmt::to_wstring(mainGame->dInfo.lp[0]);
-		mainGame->dInfo.strLP[1] = fmt::to_wstring(mainGame->dInfo.lp[1]);
+		mainGame->dInfo.strLP[0] = epro::to_wstring(mainGame->dInfo.lp[0]);
+		mainGame->dInfo.strLP[1] = epro::to_wstring(mainGame->dInfo.lp[1]);
 		uint16_t deckc = BufferIO::Read<uint16_t>(pbuf);
 		uint16_t extrac = BufferIO::Read<uint16_t>(pbuf);
 		mainGame->dField.Initial(mainGame->LocalPlayer(0), deckc, extrac);
@@ -3566,7 +3566,7 @@ int DuelClient::ClientAnalyze(const uint8_t* msg, uint32_t len) {
 			mainGame->lpcstring = L"";
 		}
 		mainGame->dInfo.lp[player] = final;
-		mainGame->dInfo.strLP[player] = fmt::to_wstring(mainGame->dInfo.lp[player]);
+		mainGame->dInfo.strLP[player] = epro::to_wstring(mainGame->dInfo.lp[player]);
 		return true;
 	}
 	case MSG_RECOVER: {
@@ -3588,7 +3588,7 @@ int DuelClient::ClientAnalyze(const uint8_t* msg, uint32_t len) {
 			mainGame->lpcstring = L"";
 		}
 		mainGame->dInfo.lp[player] = final;
-		mainGame->dInfo.strLP[player] = fmt::to_wstring(mainGame->dInfo.lp[player]);
+		mainGame->dInfo.strLP[player] = epro::to_wstring(mainGame->dInfo.lp[player]);
 		return true;
 	}
 	case MSG_EQUIP: {
@@ -3625,7 +3625,7 @@ int DuelClient::ClientAnalyze(const uint8_t* msg, uint32_t len) {
 			mainGame->WaitFrameSignal(11, lock);
 		}
 		mainGame->dInfo.lp[player] = val;
-		mainGame->dInfo.strLP[player] = fmt::to_wstring(mainGame->dInfo.lp[player]);
+		mainGame->dInfo.strLP[player] = epro::to_wstring(mainGame->dInfo.lp[player]);
 		return true;
 	}
 	case MSG_UNEQUIP: {
@@ -3694,7 +3694,7 @@ int DuelClient::ClientAnalyze(const uint8_t* msg, uint32_t len) {
 			mainGame->lpcstring = L"";
 		}
 		mainGame->dInfo.lp[player] = final;
-		mainGame->dInfo.strLP[player] = fmt::to_wstring(mainGame->dInfo.lp[player]);
+		mainGame->dInfo.strLP[player] = epro::to_wstring(mainGame->dInfo.lp[player]);
 		return true;
 	}
 	case MSG_ADD_COUNTER: {
@@ -3795,21 +3795,21 @@ int DuelClient::ClientAnalyze(const uint8_t* msg, uint32_t len) {
 		ClientCard* pcard = mainGame->dField.GetCard(info1.controler, info1.location, info1.sequence);
 		if(aatk != pcard->attack) {
 			pcard->attack = aatk;
-			pcard->atkstring = fmt::to_wstring(aatk);
+			pcard->atkstring = epro::to_wstring(aatk);
 		}
 		if(adef != pcard->defense) {
 			pcard->defense = adef;
-			pcard->defstring = fmt::to_wstring(adef);
+			pcard->defstring = epro::to_wstring(adef);
 		}
 		if(info2.location) {
 			pcard = mainGame->dField.GetCard(info2.controler, info2.location, info2.sequence);
 			if(datk != pcard->attack) {
 				pcard->attack = datk;
-				pcard->atkstring = fmt::to_wstring(datk);
+				pcard->atkstring = epro::to_wstring(datk);
 			}
 			if(ddef != pcard->defense) {
 				pcard->defense = ddef;
-				pcard->defstring = fmt::to_wstring(ddef);
+				pcard->defstring = epro::to_wstring(ddef);
 			}
 		}
 		return true;
@@ -4142,7 +4142,7 @@ int DuelClient::ClientAnalyze(const uint8_t* msg, uint32_t len) {
 		for(int i = 0; i < 2; ++i) {
 			int p = mainGame->LocalPlayer(i);
 			mainGame->dInfo.lp[p] = BufferIO::Read<uint32_t>(pbuf);
-			mainGame->dInfo.strLP[p] = fmt::to_wstring(mainGame->dInfo.lp[p]);
+			mainGame->dInfo.strLP[p] = epro::to_wstring(mainGame->dInfo.lp[p]);
 			for(int seq = 0; seq < 7; ++seq) {
 				const auto is_zone_used = !!BufferIO::Read<uint8_t>(pbuf);
 				if(!is_zone_used)
diff --git a/gframe/event_handler.cpp b/gframe/event_handler.cpp
index 45f799a23..c24673e3e 100644
--- a/gframe/event_handler.cpp
+++ b/gframe/event_handler.cpp
@@ -774,13 +774,13 @@ bool ClientField::OnEvent(const irr::SEvent& event) {
 							if(offset + i >= select_max)
 								break;
 							if(sort_list[offset + i]) {
-								mainGame->stCardPos[i]->setText(fmt::to_wstring(sort_list[offset + i]).data());
+								mainGame->stCardPos[i]->setText(epro::to_wstring(sort_list[offset + i]).data());
 							} else mainGame->stCardPos[i]->setText(L"");
 						}
 					} else {
 						select_min++;
 						sort_list[sel_seq] = select_min;
-						mainGame->stCardPos[id - BUTTON_CARD_0]->setText(fmt::to_wstring(select_min).data());
+						mainGame->stCardPos[id - BUTTON_CARD_0]->setText(epro::to_wstring(select_min).data());
 						if(select_min == select_max) {
 							uint8_t respbuf[64];
 							for(uint32_t i = 0; i < select_max; ++i)
@@ -927,7 +927,7 @@ bool ClientField::OnEvent(const irr::SEvent& event) {
 					std::wstring text = L"";
 					if(sort_list.size()) {
 						if(sort_list[pos + i] > 0)
-							text = fmt::to_wstring(sort_list[pos + i]);
+							text = epro::to_wstring(sort_list[pos + i]);
 					} else {
 						if(conti_selecting)
 							text = std::wstring{ DataManager::unknown_string };
@@ -1907,7 +1907,7 @@ bool ClientField::OnCommonEvent(const irr::SEvent& event, bool& stopPropagation)
 				try {
 					gGameConfig->maxFPS = static_cast<int32_t>(std::stol(mainGame->gSettings.ebFPSCap->getText()));
 				} catch (...) {
-					mainGame->gSettings.ebFPSCap->setText(fmt::to_wstring(gGameConfig->maxFPS).data());
+					mainGame->gSettings.ebFPSCap->setText(epro::to_wstring(gGameConfig->maxFPS).data());
 				}
 				break;
 			}
diff --git a/gframe/fmt.h b/gframe/fmt.h
index f42fa992a..e3bf6bd59 100644
--- a/gframe/fmt.h
+++ b/gframe/fmt.h
@@ -37,6 +37,18 @@ namespace epro {
 using fmt::format;
 using fmt::sprintf;
 using fmt::print;
+using fmt::format_to_n;
+#if FMT_VERSION >= 60000
+using fmt::to_string;
+using fmt::to_wstring;
+#else
+template <typename T> inline std::string to_string(const T& value) {
+	return format("{}", value);
+}
+template <typename T> inline std::wstring to_wstring(const T& value) {
+	return format(L"{}", value);
+}
+#endif
 }
 
 #endif
diff --git a/gframe/game.cpp b/gframe/game.cpp
index 8a32f2d55..8b3d60044 100644
--- a/gframe/game.cpp
+++ b/gframe/game.cpp
@@ -1182,7 +1182,7 @@ void Game::PopulateGameHostWindows() {
 		ReloadCBRule();
 		cbRule->setSelected(gGameConfig->lastallowedcards);
 		defaultStrings.emplace_back(env->addStaticText(gDataManager->GetSysString(1227).data(), Scale(20, 70, 220, 90), false, false, tDuelSettings), 1227);
-#define WStr(i) fmt::to_wstring<int>(i).data()
+#define WStr(i) epro::to_wstring<int>(i).data()
 		ebTeam1 = env->addEditBox(WStr(gGameConfig->team1count), Scale(140, 65, 170, 90), true, tDuelSettings, EDITBOX_TEAM_COUNT);
 		ebTeam1->setTextAlignment(irr::gui::EGUIA_CENTER, irr::gui::EGUIA_CENTER);
 		auto vsstring = env->addStaticText(gDataManager->GetSysString(1380).data(), Scale(175, 65, 195, 90), false, false, tDuelSettings);
@@ -2751,7 +2751,7 @@ void Game::UpdateRepoInfo(const GitRepo* repo, RepoGui* grepo) {
 	grepo->history_button2->setEnabled(true);
 	if(!repo->is_language) {
 		script_dirs.insert(script_dirs.begin(), Utils::ToPathString(repo->script_path));
-		auto init_script = fmt::format(EPRO_TEXT("{}{}"), script_dirs.front(), EPRO_TEXT("init.lua"));
+		auto init_script = epro::format(EPRO_TEXT("{}{}"), script_dirs.front(), EPRO_TEXT("init.lua"));
 		if(Utils::FileExists(init_script))
 			init_scripts.push_back(std::move(init_script));
 		auto script_subdirs = Utils::FindSubfolders(Utils::ToPathString(repo->script_path), 2);
diff --git a/gframe/game_config.cpp b/gframe/game_config.cpp
index 9cd47cbc8..bb72a0e68 100644
--- a/gframe/game_config.cpp
+++ b/gframe/game_config.cpp
@@ -158,12 +158,12 @@ uint8_t parseOption<uint8_t, ygo::GameConfig::BoolMaybeUndefined>(std::string& v
 
 template<typename T>
 std::string serializeOption(const T& value) {
-	return fmt::to_string(value);
+	return epro::to_string(value);
 }
 
 template<>
 std::string serializeOption(const uint8_t& value) {
-	return fmt::to_string((int)value);
+	return epro::to_string((int)value);
 }
 
 template<>
@@ -173,7 +173,7 @@ std::string serializeOption(const float& value) {
 
 template<>
 std::string serializeOption(const bool& value) {
-	return fmt::to_string((int)value);
+	return epro::to_string((int)value);
 }
 
 template<>
diff --git a/gframe/menu_handler.cpp b/gframe/menu_handler.cpp
index 73b47ab86..a86f09b16 100644
--- a/gframe/menu_handler.cpp
+++ b/gframe/menu_handler.cpp
@@ -664,8 +664,8 @@ bool MenuHandler::OnEvent(const irr::SEvent& event) {
 				if(sel == -1)
 					break;
 				const auto& selection = DuelClient::hosts[sel];
-				mainGame->ebJoinHost->setText(fmt::format(L"{}", selection.address).data());
-				mainGame->ebJoinPort->setText(fmt::to_wstring(selection.port).data());
+				mainGame->ebJoinHost->setText(epro::to_wstring(selection.address).data());
+				mainGame->ebJoinPort->setText(epro::to_wstring(selection.port).data());
 				break;
 			}
 			case LISTBOX_REPLAY_LIST: {
@@ -965,12 +965,12 @@ bool MenuHandler::OnEvent(const irr::SEvent& event) {
 			switch (id) {
 			case COMBOBOX_DUEL_RULE: {
 				auto setDeckSizes = [&](const DeckSizes& size) {
-					mainGame->ebMainMin->setText(fmt::to_wstring<int>(size.main.min).data());
-					mainGame->ebMainMax->setText(fmt::to_wstring<int>(size.main.max).data());
-					mainGame->ebExtraMin->setText(fmt::to_wstring<int>(size.extra.min).data());
-					mainGame->ebExtraMax->setText(fmt::to_wstring<int>(size.extra.max).data());
-					mainGame->ebSideMin->setText(fmt::to_wstring<int>(size.side.min).data());
-					mainGame->ebSideMax->setText(fmt::to_wstring<int>(size.side.max).data());
+					mainGame->ebMainMin->setText(epro::to_wstring<int>(size.main.min).data());
+					mainGame->ebMainMax->setText(epro::to_wstring<int>(size.main.max).data());
+					mainGame->ebExtraMin->setText(epro::to_wstring<int>(size.extra.min).data());
+					mainGame->ebExtraMax->setText(epro::to_wstring<int>(size.extra.max).data());
+					mainGame->ebSideMin->setText(epro::to_wstring<int>(size.side.min).data());
+					mainGame->ebSideMax->setText(epro::to_wstring<int>(size.side.max).data());
 				};
 				static constexpr DeckSizes ocg_deck_sizes{ {40,60}, {0,15}, {0,15} };
 				static constexpr DeckSizes rush_deck_sizes{ {40,60}, {0,15}, {0,15} };
diff --git a/gframe/old_replay_mode.cpp b/gframe/old_replay_mode.cpp
index c410d64a2..3b6ee650f 100644
--- a/gframe/old_replay_mode.cpp
+++ b/gframe/old_replay_mode.cpp
@@ -124,7 +124,7 @@ namespace ygo {
 		mainGame->dInfo.lp[0] = start_lp;
 		mainGame->dInfo.lp[1] = start_lp;
 		mainGame->dInfo.startlp = start_lp;
-		mainGame->dInfo.strLP[0] = fmt::to_wstring(start_lp);
+		mainGame->dInfo.strLP[0] = epro::to_wstring(start_lp);
 		mainGame->dInfo.strLP[1] = mainGame->dInfo.strLP[0];
 		mainGame->dInfo.turn = 0;
 		if (!mainGame->dInfo.isSingleMode || (replay_header.base.flag & REPLAY_HAND_TEST)) {
diff --git a/gframe/repo_cloner.cpp b/gframe/repo_cloner.cpp
index cec898a59..9e5758744 100644
--- a/gframe/repo_cloner.cpp
+++ b/gframe/repo_cloner.cpp
@@ -106,7 +106,7 @@ int repo_cloner_main(const args_t& args) {
 		}
 		if(should_print) {
 			// prints a json array contaning all the info about the repos being cloned
-			fmt::print("[{{{}}}]\n", fmt::join(repos_to_clone.begin(), repos_to_clone.end(), "},{"));
+			epro::print("[{{{}}}]\n", fmt::join(repos_to_clone.begin(), repos_to_clone.end(), "},{"));
 			std::fflush(stdout);
 		}
 		std::this_thread::sleep_for(std::chrono::milliseconds(500));
diff --git a/gframe/single_mode.cpp b/gframe/single_mode.cpp
index 6daf3a531..997b63173 100644
--- a/gframe/single_mode.cpp
+++ b/gframe/single_mode.cpp
@@ -96,7 +96,7 @@ int SingleMode::SinglePlayThread(DuelOptions&& duelOptions) {
 	mainGame->dInfo.compat_mode = false;
 	mainGame->dInfo.legacy_race_size = false;
 	mainGame->dInfo.startlp = mainGame->dInfo.lp[0] = mainGame->dInfo.lp[1] = duelOptions.startingLP;
-	mainGame->dInfo.strLP[0] = mainGame->dInfo.strLP[1] = fmt::to_wstring(mainGame->dInfo.lp[0]);
+	mainGame->dInfo.strLP[0] = mainGame->dInfo.strLP[1] = epro::to_wstring(mainGame->dInfo.lp[0]);
 	mainGame->dInfo.selfnames = { mainGame->ebNickName->getText() };
 	mainGame->dInfo.opponames = { L"" };
 	mainGame->dInfo.player_type = 0;
diff --git a/gframe/windbot.cpp b/gframe/windbot.cpp
index e81267220..73890e33c 100644
--- a/gframe/windbot.cpp
+++ b/gframe/windbot.cpp
@@ -55,11 +55,11 @@ WindBot::launch_ret_t WindBot::Launch(int port, epro::wstringview pass, bool cha
 	nlohmann::json param({
 							{"HostInfo", BufferIO::EncodeUTF8(pass)},
 							{"Deck", BufferIO::EncodeUTF8(deck)},
-							{"Port", fmt::to_string(port)},
-							{"Version", fmt::to_string(version)},
+							{"Port", epro::to_string(port)},
+							{"Version", epro::to_string(version)},
 							{"Name", BufferIO::EncodeUTF8(name)},
-							{"Chat", fmt::to_string(static_cast<int>(chat))},
-							{"Hand", fmt::to_string(hand)}
+							{"Chat", epro::to_string(static_cast<int>(chat))},
+							{"Hand", epro::to_string(hand)}
 						  });
 	if(overridedeck)
 		param["DeckFile"] = BufferIO::EncodeUTF8(overridedeck);
diff --git a/gframe/windbot_panel.cpp b/gframe/windbot_panel.cpp
index 5a3a52789..de08542fa 100644
--- a/gframe/windbot_panel.cpp
+++ b/gframe/windbot_panel.cpp
@@ -72,7 +72,7 @@ void WindBotPanel::UpdateDescription() {
 		for (auto rule : bot.masterRules) {
 			if (mr.size())
 				mr.push_back(L',');
-			mr.append(fmt::to_wstring(rule));
+			mr.append(epro::to_wstring(rule));
 		}
 		params.append(epro::format(gDataManager->GetSysString(2057), mr)).push_back(L'\n');
 	}