diff --git a/.gitignore b/.gitignore
index 9cc0dd3..e8b0031 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,3 +25,5 @@
 /libcxx-10.0.0rc2.src.tar.xz
 /libcxx-10.0.0rc3.src.tar.xz
 /libcxx-10.0.0rc3.src.tar.xz.sig
+/libcxx-10.0.0rc4.src.tar.xz
+/libcxx-10.0.0rc4.src.tar.xz.sig
diff --git a/libcxx.spec b/libcxx.spec
index 62b08b3..2a88c9d 100644
--- a/libcxx.spec
+++ b/libcxx.spec
@@ -1,8 +1,8 @@
 # If you need to bootstrap this, turn this on.
 # Otherwise, you have a loop with libcxxabi
 %global bootstrap 0
-%global rc_ver 3
-%global baserelease 0.3
+%global rc_ver 4
+%global baserelease 0.4
 
 %global libcxx_srcdir libcxx-%{version}%{?rc_ver:rc%{rc_ver}}.src
 
@@ -92,6 +92,9 @@ make install DESTDIR=%{buildroot}
 
 
 %changelog
+* Sun Mar 15 2020 sguelton@redhat.com - 10.0.0-0.4.rc4
+- 10.0.0 rc4
+
 * Thu Mar 05 2020 sguelton@redhat.com - 10.0.0-0.3.rc3
 - 10.0.0 rc3
 
diff --git a/sources b/sources
index f8f523e..f85ae9f 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (libcxx-10.0.0rc3.src.tar.xz) = a84df0bb58b9782aa3fbf24ce2670bf33dd97c9bfd9461bcb365ac5c931f1886ab7dde35c5248ebfb05b38bddd3069fbaf925e9bbf3b0fe785d3bcfaf42669cc
-SHA512 (libcxx-10.0.0rc3.src.tar.xz.sig) = 9fb207a971338a9d543c1034e92ec6ae554885455d89f81efe4c5f8b788754f275c5d79129389f9faee3241c43e5d09e532818b083accc5e502678096a359da9
+SHA512 (libcxx-10.0.0rc4.src.tar.xz) = 9532ea70c7d8eaf47bc4a65d199d78399ff7d89c579e754c271ffec7f236b95d917c8fb6b95c80138bad24bffaf85b069280df087cacbe006e1febd7ca52b807
+SHA512 (libcxx-10.0.0rc4.src.tar.xz.sig) = 0795b708ab49a09d88f03a8af162011831eec51b0d737b99510c14716b597cd455292ebf1898d60f4586cd5f4bc7aa66f95c75b51b77388a686ac6dc1f62b16b