diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 525450fc..fdf95ae3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,7 +29,7 @@ jobs:
       with:
         matrix: |
           os {linux},   cpu {amd64}, builder {ubuntu-latest},  tests {all},         nim_version {${{ env.nim_version }}}, shell {bash --noprofile --norc -e -o pipefail}
-          os {macos},   cpu {amd64}, builder {macos-latest},   tests {all},         nim_version {${{ env.nim_version }}}, shell {bash --noprofile --norc -e -o pipefail}
+          os {macos},   cpu {amd64}, builder {macos-13},       tests {all},         nim_version {${{ env.nim_version }}}, shell {bash --noprofile --norc -e -o pipefail}
           os {windows}, cpu {amd64}, builder {windows-latest}, tests {unittest},    nim_version {${{ env.nim_version }}}, shell {msys2}
           os {windows}, cpu {amd64}, builder {windows-latest}, tests {contract},    nim_version {${{ env.nim_version }}}, shell {msys2}
           os {windows}, cpu {amd64}, builder {windows-latest}, tests {integration}, nim_version {${{ env.nim_version }}}, shell {msys2}