diff --git a/Readme.md b/Readme.md
index 29bd113..be550e7 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,7 +1,7 @@
 Boost libraries - trimmed down for Citra
 ========================================
 
-This is a subset of Boost v1.67.0 generated using the bcp tool. To get a list of boost modules guaranteed to exist, check the build script.
+This is a subset of Boost v1.70.0 generated using the bcp tool. To get a list of boost modules guaranteed to exist, check the build script.
 
 Updating this repo (on Windows)
 ===============================
@@ -16,9 +16,8 @@ To update the Boost version (or to add a new library) follow these steps:
     ```
 
   - Store the boost directory in a variable for later use: `$boost_dir = $pwd`.
-  - Add bcp to your path: `$env:Path += $boost_dir\bin.v2\tools\bcp\msvc-14.1\release\link-static\threading-multi` (The correct output path should be printed by b2 during the build.)
+  - Add bcp to your path: `$env:Path += ";$boost_dir\bin.v2\tools\bcp\msvc-14.2\release\link-static\threading-multi"` (The correct output path should be printed by b2 during the build.)
   - `cd` to this repo's directory (`...\externals\boost\`)
   - Remove the existing boost from the repo: `rm -r boost` (This is only necessary if doing a Boost version upgrade, in case they removed any files in the new version.)
   - Run `.\build.cmd $boost_dir` to build a new trimmed down distro.
-  - Remove `libs\` and `Jamroot` if you didn't introduce any new boost dependencies that aren't header only
   - Add/remove all files in git and commit.
diff --git a/boost/serialization/unique_ptr.hpp b/boost/serialization/unique_ptr.hpp
new file mode 100644
index 0000000..8d8703e
--- /dev/null
+++ b/boost/serialization/unique_ptr.hpp
@@ -0,0 +1,68 @@
+#ifndef  BOOST_SERIALIZATION_UNIQUE_PTR_HPP
+#define BOOST_SERIALIZATION_UNIQUE_PTR_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// unique_ptr.hpp:
+
+// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
+// Use, modification and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org for updates, documentation, and revision history.
+#include <memory>
+#include <boost/serialization/split_free.hpp>
+#include <boost/serialization/nvp.hpp>
+
+namespace boost {
+namespace serialization {
+
+/////////////////////////////////////////////////////////////
+// implement serialization for unique_ptr< T >
+// note: this must be added to the boost namespace in order to
+// be called by the library
+template<class Archive, class T>
+inline void save(
+    Archive & ar,
+    const std::unique_ptr< T > &t,
+    const unsigned int /*file_version*/
+){
+    // only the raw pointer has to be saved
+    // the ref count is rebuilt automatically on load
+    const T * const tx = t.get();
+    ar << BOOST_SERIALIZATION_NVP(tx);
+}
+
+template<class Archive, class T>
+inline void load(
+    Archive & ar,
+    std::unique_ptr< T > &t,
+    const unsigned int /*file_version*/
+){
+    T *tx;
+    ar >> BOOST_SERIALIZATION_NVP(tx);
+    // note that the reset automagically maintains the reference count
+    t.reset(tx);
+}
+
+// split non-intrusive serialization function member into separate
+// non intrusive save/load member functions
+template<class Archive, class T>
+inline void serialize(
+    Archive & ar,
+    std::unique_ptr< T > &t,
+    const unsigned int file_version
+){
+    boost::serialization::split_free(ar, t, file_version);
+}
+
+} // namespace serialization
+} // namespace boost
+
+
+#endif // BOOST_SERIALIZATION_UNIQUE_PTR_HPP
diff --git a/build.cmd b/build.cmd
index 3f87c01..afce2d2 100644
--- a/build.cmd
+++ b/build.cmd
@@ -27,4 +27,5 @@ bcp ^
     boost/serialization/unordered_map.hpp ^
     boost/serialization/unordered_set.hpp ^
     boost/serialization/shared_ptr.hpp ^
+    boost/serialization/unique_ptr.hpp ^
     --boost="%1" .