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diff --git a/deps/sol2/include/sol/map.hpp b/deps/sol2/include/sol/map.hpp
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+// sol3
+
+// The MIT License (MIT)
+
+// Copyright (c) 2013-2019 Rapptz, ThePhD and contributors
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SOL_MAP_HPP
+#define SOL_MAP_HPP
+
+#include <unordered_map>
+#if defined(SOL_USE_BOOST)
+#include <boost/unordered_map.hpp>
+#endif // SOL_USE_BOOST
+
+namespace sol {
+namespace detail {
+#if defined(SOL_USE_BOOST)
+#if defined(SOL_CXX17_FEATURES)
+	template <typename K, typename V, typename H = std::hash<K>, typename E = std::equal_to<>>
+	using unordered_map = boost::unordered_map<K, V, H, E>;
+#else
+	template <typename K, typename V, typename H = boost::hash<K>, typename E = std::equal_to<>>
+	using unordered_map = boost::unordered_map<K, V, H, E>;
+#endif // C++17 or not, WITH boost
+#else
+	template <typename K, typename V, typename H = std::hash<K>, typename E = std::equal_to<>>
+	using unordered_map = std::unordered_map<K, V, H, E>;
+#endif // Boost map target
+}
+
+} // namespace sol::detail
+
+#endif // SOL_MAP_HPP