diff --git a/.gitignore b/.gitignore
index e116872..1c25159 100644
--- a/.gitignore
+++ b/.gitignore
@@ -155,3 +155,7 @@
 /clang-12.0.0rc3.src.tar.xz.sig
 /clang-tools-extra-12.0.0rc3.src.tar.xz
 /clang-tools-extra-12.0.0rc3.src.tar.xz.sig
+/clang-12.0.0rc4.src.tar.xz
+/clang-tools-extra-12.0.0rc4.src.tar.xz
+/clang-tools-extra-12.0.0rc4.src.tar.xz.sig
+/clang-12.0.0rc4.src.tar.xz.sig
diff --git a/clang.spec b/clang.spec
index 6fff31f..3fb56a7 100644
--- a/clang.spec
+++ b/clang.spec
@@ -3,8 +3,8 @@
 %global maj_ver 12
 %global min_ver 0
 %global patch_ver 0
-%global rc_ver 3
-%global baserelease 8
+%global rc_ver 4
+%global baserelease 9
 
 %global clang_tools_binaries \
 	%{_bindir}/clang-apply-replacements \
@@ -533,6 +533,9 @@ false
 
 %endif
 %changelog
+* Fri Apr 02 2021 sguelton@redhat.com - 12.0.0-0.9.rc4
+- New upstream release candidate
+
 * Wed Mar 31 2021 Jonathan Wakely <jwakely@redhat.com> - 12.0.0-0.8.rc3
 - Rebuilt for removed libstdc++ symbols (#1937698)
 
diff --git a/sources b/sources
index a053f3c..35cba2c 100644
--- a/sources
+++ b/sources
@@ -1,4 +1,4 @@
-SHA512 (clang-12.0.0rc3.src.tar.xz) = 6cb43ae4b2fdacc96dd7068da6222996b697904ab589d809c4200bc3ccb369b41b4ac328a36984b66869ea2b21b9e96f7cd783bb20c728cca93a22ac9a8c4a8d
-SHA512 (clang-12.0.0rc3.src.tar.xz.sig) = c6fb4e9177464affe68029bb1c5ffa51a78b46b81cbd5f26ffbad63bc99447cd3259353163107e0404e19684304e1738aa4a3fce4899337f9ca39cdf295bbd68
-SHA512 (clang-tools-extra-12.0.0rc3.src.tar.xz) = 6cfe68d9558bf468cce36da9ff81100b083fea9d802218a41785d4c679217c7df19c7e2408b7d5889648ed61e5efd3e490049b85d4e305284e68db77bd7b2a93
-SHA512 (clang-tools-extra-12.0.0rc3.src.tar.xz.sig) = dc3a25ead0448e018cd83bf9b5c3ce0c0c9982838c17743fe3d2288f3bd02edc92c531ce41e4b5c5800ebb8c169714c4b4d25922ad01b5598ab217322885314b
+SHA512 (clang-12.0.0rc4.src.tar.xz) = 47bf7edc14120677b14893eedaf52f17f57c52810099fe1779a3c330220ffcc13660feb5a033be4c0b8baf7b639e36121b98d18b534f3a22d62e2bd70fa5c9f6
+SHA512 (clang-tools-extra-12.0.0rc4.src.tar.xz) = 9cb2745b8d447287dd3d1f3221edcea8b18d77809b8f83c1bb04ff28259806866e5700be89154fd70ae3c5e06e99431076ecf9022fddaf59f4b55e0a729a0746
+SHA512 (clang-tools-extra-12.0.0rc4.src.tar.xz.sig) = 0a3e7b43ce0649299ea0f9aa4d7d94e5fe568dcab803336ec453800112ab72d60923ad202c0f0d6053cfebf9a41d2859399f8f122cd4435985daf67c31772736
+SHA512 (clang-12.0.0rc4.src.tar.xz.sig) = fd935914917a50e13a9945eb5d2cc10aec560fc41aac056bb4362f37a04857d2705b10791374d6c69e2b7cd0949430331fbb8583e605b77663e8140b2b88a693