diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4b7a541..9bb1372 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -136,6 +136,9 @@ jobs:
           - toolset: clang
             cxxstd: "03,11,14,17,20,2b"
             os: macos-12
+          - toolset: clang
+            cxxstd: "03,11,14,17,20,2b"
+            os: macos-13
 
     runs-on: ${{matrix.os}}
     container: ${{matrix.container}}
@@ -155,7 +158,9 @@ jobs:
 
       - name: Install packages
         if: matrix.install
-        run: sudo apt-get -y install ${{matrix.install}}
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install ${{matrix.install}}
 
       - name: Setup Boost
         run: |