diff --git a/.gitignore b/.gitignore
index c86db41..8d651e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -67,3 +67,5 @@
 /lldb-12.0.0rc2.src.tar.xz.sig
 /lldb-12.0.0rc3.src.tar.xz
 /lldb-12.0.0rc3.src.tar.xz.sig
+/lldb-12.0.0rc4.src.tar.xz
+/lldb-12.0.0rc4.src.tar.xz.sig
diff --git a/lldb.spec b/lldb.spec
index 103f97a..c0208f2 100644
--- a/lldb.spec
+++ b/lldb.spec
@@ -1,5 +1,5 @@
-%global rc_ver 3
-%global baserelease 9
+%global rc_ver 4
+%global baserelease 10
 %global lldb_srcdir %{name}-%{version}%{?rc_ver:rc%{rc_ver}}.src
 
 Name:		lldb
@@ -130,6 +130,9 @@ rm -f %{buildroot}%{python3_sitearch}/six.*
 %{python3_sitearch}/lldb
 
 %changelog
+* Fri Apr 02 2021 sguelton@redhat.com - 12.0.0-10.rc4
+- New upstream release candidate
+
 * Wed Mar 31 2021 Jonathan Wakely <jwakely@redhat.com> - 12.0.0-9.rc3
 - Rebuilt for removed libstdc++ symbols (#1937698)
 
diff --git a/sources b/sources
index f256f50..56da6b2 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (lldb-12.0.0rc3.src.tar.xz) = 2cc8040f1cd72fb205b7577f50897d4fc83af357b133a6ee3baaf99149c14821afc3299fe375a723c3e7e8812b0232bb691efe34e48dccffae49a6699e88caa4
-SHA512 (lldb-12.0.0rc3.src.tar.xz.sig) = f53e435d79440c3d14943ed4a0e49598acee00072ecc94f8b467f7dcd4161341d7477bdb3dee381a782bbdbf96a60e349905ebe3e648e81def63bca140994843
+SHA512 (lldb-12.0.0rc4.src.tar.xz) = bc962020094de8689778117339e6e99d63e4bfcbed16444070c78fb74d8095926edbd8b221c7b2ce3153d7004bb99a632b2c79c9207ad6ede5f8d282409b7c10
+SHA512 (lldb-12.0.0rc4.src.tar.xz.sig) = 28e76a145ef9ab768d58d7f39cb825c00ebc8e5862477757515449410cf4303c166ef879db0e104809a0fe368aae4a57390b47736ff4a017fef2125defc1b375