diff --git a/libclc-12.0.0.src.tar.xz b/libclc-12.0.0.src.tar.xz
deleted file mode 100644
index 3a317b3..0000000
--- a/libclc-12.0.0.src.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:6b777ee2cd57da1b122f76c208463f620eef508f4128210c6b1a96bfb75c74dc
-size 124192
diff --git a/libclc-13.0.0.src.tar.xz b/libclc-13.0.0.src.tar.xz
new file mode 100644
index 0000000..7af1290
--- /dev/null
+++ b/libclc-13.0.0.src.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7dc0131f05842a8ed29997362de260c82e188aa0639e482683ece8b47cca21b2
+size 125820
diff --git a/libclc.changes b/libclc.changes
index cf2c114..69027a6 100644
--- a/libclc.changes
+++ b/libclc.changes
@@ -1,3 +1,20 @@
+-------------------------------------------------------------------
+Sat Oct  2 20:13:04 UTC 2021 - Aaron Puchert <aaronpuchert@alice-dsl.net>
+
+- Update to version 0.2.0+llvm13.0.0.
+- Make it easier to build release candidates.
+
+-------------------------------------------------------------------
+Wed Sep 29 12:44:19 UTC 2021 - Stefan Dirsch <sndirsch@suse.com>
+
+- fixed broken %{_llvm_sonum} in libcl(llvm%{_llvm_sonum}) Provides
+  by buildrequiring appropriate llvm/clang -devel packages
+
+-------------------------------------------------------------------
+Wed Sep 29 12:00:22 UTC 2021 - Stefan Dirsch <sndirsch@suse.com>
+
+- needed for jira#SLE/SLE-18743 (Mesa update for sle15-sp4/Leap 15.4)
+
 -------------------------------------------------------------------
 Wed Apr 14 23:57:28 UTC 2021 - Aaron Puchert <aaronpuchert@alice-dsl.net>
 
diff --git a/libclc.spec b/libclc.spec
index e12dff0..b8c7538 100644
--- a/libclc.spec
+++ b/libclc.spec
@@ -16,20 +16,32 @@
 #
 
 
-%define _libclc_llvm_ver 12.0.0
+%define _libclc_llvm_ver 13.0.0
+%define _version %_libclc_llvm_ver%{?_rc:rc%_rc}
+%define _tagver %_libclc_llvm_ver%{?_rc:-rc%_rc}
 
 Name:           libclc
-Version:        0.2.0+llvm%{_libclc_llvm_ver}
+Version:        0.2.0+llvm%{_libclc_llvm_ver}%{?_rc:~rc%_rc}
 Release:        0
 Summary:        OpenCL C programming language library
 License:        Apache-2.0 WITH LLVM-exception AND (BSD-3-Clause OR MIT)
 Group:          Development/Libraries/C and C++
 URL:            https://libclc.llvm.org/
-Source0:        https://github.com/llvm/llvm-project/releases/download/llvmorg-%{_libclc_llvm_ver}/%{name}-%{_libclc_llvm_ver}.src.tar.xz
+Source0:        https://github.com/llvm/llvm-project/releases/download/llvmorg-%{_tagver}/%{name}-%{_version}.src.tar.xz
 Source1:        %{name}-rpmlintrc
-BuildRequires:  clang-devel >= 4.0
 BuildRequires:  cmake
-BuildRequires:  llvm >= 4.0
+%if 0%{?suse_version} >= 1550
+BuildRequires:  clang-devel
+BuildRequires:  llvm-devel
+%else
+%if 0%{?sle_version} >= 150300
+BuildRequires:  clang11-devel
+BuildRequires:  llvm11-devel
+%else
+BuildRequires:  clang9-devel
+BuildRequires:  llvm9-devel
+%endif
+%endif
 BuildRequires:  python3-base
 Provides:       libclc(llvm%{_llvm_sonum})
 BuildArch:      noarch
@@ -38,7 +50,7 @@ BuildArch:      noarch
 Library requirements of the OpenCL C programming language.
 
 %prep
-%setup -q -n libclc-%{_libclc_llvm_ver}.src
+%setup -q -n libclc-%{_version}.src
 
 %build
 # The libraries are bitcode files, so LTO is neither supported nor does it help.