diff --git a/.gitignore b/.gitignore
index 9895389..a2da162 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,5 @@
 /libcxx-8.0.0.src.tar.xz
 /libcxx-9.0.0.src.tar.xz
 /libcxx-9.0.1.src.tar.xz
+/libcxx-10.0.0rc1.src.tar.xz
+/libcxx-10.0.0rc1.src.tar.xz.sig
diff --git a/hans-gpg-key.asc b/hans-gpg-key.asc
new file mode 100644
index 0000000..4b3cdde
--- /dev/null
+++ b/hans-gpg-key.asc
@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+67H2IH//2sf8dw==
+=ADVe
+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/libcxx.spec b/libcxx.spec
index 94bf7d9..bc16f0a 100644
--- a/libcxx.spec
+++ b/libcxx.spec
@@ -1,18 +1,21 @@
 # If you need to bootstrap this, turn this on.
 # Otherwise, you have a loop with libcxxabi
-%global bootstrap 0
-#%%global rc_ver 4
-%global baserelease 2
+%global bootstrap 1
+%global rc_ver 1
+%global baserelease 0.1
 
 %global libcxx_srcdir libcxx-%{version}%{?rc_ver:rc%{rc_ver}}.src
 
 Name:		libcxx
-Version:	9.0.1
+Version:	10.0.0
 Release:	%{baserelease}%{?rc_ver:.rc%{rc_ver}}%{?dist}
 Summary:	C++ standard library targeting C++11
 License:	MIT or NCSA
 URL:		http://libcxx.llvm.org/
 Source0:	http://%{?rc_ver:pre}releases.llvm.org/%{version}/%{?rc_ver:rc%{rc_ver}}/%{libcxx_srcdir}.tar.xz
+Source1:	https://%{?rc_ver:pre}releases.llvm.org/%{version}/%{?rc_ver:rc%{rc_ver}}/%{libcxx_srcdir}.tar.xz.sig
+Source2:	https://prereleases.llvm.org/%{version}/hans-gpg-key.asc
+
 BuildRequires:	gcc-c++ llvm-devel cmake llvm-static
 %if %{bootstrap} < 1
 BuildRequires:	libcxxabi-devel
@@ -89,6 +92,9 @@ make install DESTDIR=%{buildroot}
 
 
 %changelog
+* Fri Jan 31 2020 sguelton@redhat.com - 10.0.0-0.1.rc1
+- 10.0.0 rc1
+
 * Wed Jan 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 9.0.1-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
 
diff --git a/sources b/sources
index 3e587ee..7748a57 100644
--- a/sources
+++ b/sources
@@ -1 +1,2 @@
-SHA512 (libcxx-9.0.1.src.tar.xz) = aabbc98c5bd6935d3dabfb309dfc171fbc16441396628d22d8dcdb89a5015f8fdedef4237134b841314d572205f7d5cfe44c1c8900db0f0156810f7810376bb2
+SHA512 (libcxx-10.0.0rc1.src.tar.xz.sig) = 2c66bfc91e928efd978c655ce1c1077c3b2c2d878bca241a2170a6c43195d2d80d399c3036a1643ae2bbe32d30c32267c3939696efcd8c446bef1760efd6c6ab
+SHA512 (libcxx-10.0.0rc1.src.tar.xz) = 8e27b4faf1cb0e277e54904c9ad560000a7ed5f3c3c03324e03e084ba3fbf9d13eeaaa6835e7cd7b80700ad1f4e7b452841d8f2f01225ac18990db633143b5e1