diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5df3f25..1f32bb1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,7 +27,7 @@
   project(libcxx CXX C)
 
   set(PACKAGE_NAME libcxx)
-  set(PACKAGE_VERSION 9.0.0svn)
+  set(PACKAGE_VERSION 10.0.0svn)
   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
   set(PACKAGE_BUGREPORT "llvm-bugs@lists.llvm.org")
 
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 29cee44..f1dd6f9 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -1,6 +1,6 @@
-========================================
-Libc++ 9.0.0 (In-Progress) Release Notes
-========================================
+=========================================
+Libc++ 10.0.0 (In-Progress) Release Notes
+=========================================
 
 .. contents::
    :local:
@@ -10,7 +10,7 @@
 
 .. warning::
 
-   These are in-progress notes for the upcoming libc++ 9 release.
+   These are in-progress notes for the upcoming libc++ 10 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.
 
@@ -18,7 +18,7 @@
 ============
 
 This document contains the release notes for the libc++ C++ Standard Library,
-part of the LLVM Compiler Infrastructure, release 9.0.0. Here we describe the
+part of the LLVM Compiler Infrastructure, release 10.0.0. Here we describe the
 status of libc++ in some detail, including major improvements from the previous
 release and new feature work. For the general LLVM release notes, see `the LLVM
 documentation <https://llvm.org/docs/ReleaseNotes.html>`_. All LLVM releases may
@@ -32,8 +32,8 @@
 the current one. To see the release notes for a specific release, please
 see the `releases page <https://llvm.org/releases/>`_.
 
-What's New in Libc++ 9.0.0?
-===========================
+What's New in Libc++ 10.0.0?
+============================
 
 New Features
 ------------
diff --git a/docs/conf.py b/docs/conf.py
index e88b2d3..414f1bc 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -47,9 +47,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '9.0'
+version = '10.0'
 # The full version, including alpha/beta/rc tags.
-release = '9.0'
+release = '10.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/include/__config b/include/__config
index 1ecced9..61ca544 100644
--- a/include/__config
+++ b/include/__config
@@ -32,7 +32,7 @@
 #  define _GNUC_VER_NEW 0
 #endif
 
-#define _LIBCPP_VERSION 9000
+#define _LIBCPP_VERSION 10000
 
 #ifndef _LIBCPP_ABI_VERSION
 #  define _LIBCPP_ABI_VERSION 1
diff --git a/include/__libcpp_version b/include/__libcpp_version
index d58c55a..5caff40 100644
--- a/include/__libcpp_version
+++ b/include/__libcpp_version
@@ -1 +1 @@
-9000
+10000