diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7a834934b..055f3f659 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -353,7 +353,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ 'macos-11.0' ]
+        os: [ 'macos-10.15' ]
         llvm: [ '11' ]
         cxxcommon_version: [ 'v0.1.1' ]
 
@@ -444,7 +444,7 @@ jobs:
         id: cxxcommon_installer
         working-directory: ${{ steps.build_paths.outputs.DOWNLOADS }}
         run: |
-          folder_name="vcpkg_macos-11.0_llvm-${{ matrix.llvm }}_xcode-12.2.0_amd64"
+          folder_name="vcpkg_${{ matrix.os }}_llvm-${{ matrix.llvm }}_xcode-12.1.0_amd64"
           archive_name="${folder_name}.tar.xz"
 
           url="https://github.com/trailofbits/cxx-common/releases/download/${{ matrix.cxxcommon_version}}/${archive_name}"
@@ -585,7 +585,7 @@ jobs:
       - name: Store the TGZ package
         uses: actions/upload-artifact@v1
         with:
-          name: macos-11.0_llvm${{ matrix.llvm }}_tgz_package
+          name: ${{ matrix.os }}_llvm${{ matrix.llvm }}_tgz_package
           path: ${{ steps.package_names.outputs.TGZ_PACKAGE_PATH }}
 
 
@@ -652,7 +652,7 @@ jobs:
   release_macos:
     # Do not run the release procedure if any of the builds has failed
     needs: [ build_linux, build_macos ]
-    runs-on: 'macos-11.0'
+    runs-on: 'macos-10.15'
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags')
 
     steps:
@@ -674,10 +674,10 @@ jobs:
 
       - name: Group the packages by platform
         run: |
-          zip -r9 anvill_macos-11.0_packages.zip \
-                  macos-11.0*
+          zip -r9 anvill_macos-10.15_packages.zip \
+                  macos-10.15*
 
-      - name: Upload the macOS 11.0 packages
+      - name: Upload the macOS 10.15 packages
         uses: actions/upload-release-asset@v1
 
         env:
@@ -685,6 +685,6 @@ jobs:
 
         with:
           upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: anvill_macos-11.0_packages.zip
-          asset_name: anvill_macos-11.0_packages.zip
+          asset_path: anvill_macos-10.15_packages.zip
+          asset_name: anvill_macos-10.15_packages.zip
           asset_content_type: application/gzip