diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 808b6d0..99fe32a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -106,10 +106,10 @@ jobs:
       # Install the dependencies and clang 13.  Earlier versions of clang don't
       # find the multilib things for this week's Ubuntu filesystem layout.
       run: |
-        wget https://apt.llvm.org/llvm.sh
-        chmod +x llvm.sh
-        sudo ./llvm.sh 13
-        sudo apt install libstdc++-9-dev-${{ matrix.arch }}-cross qemu-user ninja-build lld-13 clang-13
+        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+        sudo add-apt-repository "deb http://apt.llvm.org/focal/     llvm-toolchain-focal-13  main"
+        sudo apt update
+        sudo apt install libstdc++-9-dev-${{ matrix.arch }}-cross qemu-user ninja-build clang-13 lld-13
     - name: Configure
       run: >
         RTLD_NAME=${{ matrix.rtld }}
diff --git a/README.md b/README.md
index 61a7a8c..96c6311 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Comprehensive details about snmalloc's design can be found in the
 current implementation are [described here](difference.md).
 Since writing the paper, the performance of snmalloc has improved considerably.
 
-[![snmalloc CI](https://github.com/microsoft/snmalloc/actions/workflows/main.yml/badge.svg)](https://github.com/microsoft/snmalloc/actions/workflows/main.yml)
+[![snmalloc CI](https://github.com/microsoft/snmalloc/actions/workflows/main.yml/badge.svg?branch=master)](https://github.com/microsoft/snmalloc/actions/workflows/main.yml)
 
 # Further documentation