diff --git a/.gitignore b/.gitignore
index 02010fd..1f93de9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,3 +58,5 @@
 /libcxxabi-12.0.0rc2.src.tar.xz.sig
 /libcxxabi-12.0.0rc3.src.tar.xz
 /libcxxabi-12.0.0rc3.src.tar.xz.sig
+/libcxxabi-12.0.0rc4.src.tar.xz
+/libcxxabi-12.0.0rc4.src.tar.xz.sig
diff --git a/libcxxabi.spec b/libcxxabi.spec
index 82c3c25..aa16077 100644
--- a/libcxxabi.spec
+++ b/libcxxabi.spec
@@ -1,6 +1,6 @@
 %global toolchain clang
-%global rc_ver 3
-%global baserelease 4
+%global rc_ver 4
+%global baserelease 5
 %global libcxxabi_srcdir libcxxabi-%{version}%{?rc_ver:rc%{rc_ver}}.src
 
 
@@ -101,6 +101,9 @@ cp -a include/* %{buildroot}%{_includedir}
 %{_libdir}/libc++abi.a
 
 %changelog
+* Fri Apr 02 2021 sguelton@redhat.com - 12.0.0-0.5.rc4
+- New upstream release candidate
+
 * Thu Mar 11 2021 sguelton@redhat.com - 12.0.0-0.4.rc3
 - LLVM 12.0.0 rc3
 
diff --git a/sources b/sources
index 54eeb63..77c0a5a 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (libcxxabi-12.0.0rc3.src.tar.xz) = 57052a2813abc79de3f1f2228cb74cd1950136426bee01f0531dff150eaf5fb7f2e70d1e95cfe5537e3642ca048ec40ce62dc25613ba2cccbea82072c661c105
-SHA512 (libcxxabi-12.0.0rc3.src.tar.xz.sig) = b38eeddd1bf8af423119154673c3d7710ef6fb914419c64a0e12266fcf96e1dad14a45315729163ff0f3feeafacf134801036c812c6d28414a63205fd8d5e7a6
+SHA512 (libcxxabi-12.0.0rc4.src.tar.xz) = 75e3dea2e4d5e21f225f306f4ddfaaf2bd4cae762bc7d31014bafc4680b4537827156031f9e66d206db00e82a63912842a332fb8ea88989f1cd120d058ef58b8
+SHA512 (libcxxabi-12.0.0rc4.src.tar.xz.sig) = 373e571b54fd23deac6f8bc9c26ce4dc3a204ac995a77fb64b0e75dfd01cfe705aaa6939b5ab21f37ad4fa66ffd140debc839fcfd75355c8d06d4387288f4b0e