diff --git a/.github/workflows/unittests.yml b/.github/workflows/unittests.yml
index f08bbce49..d307b6eec 100644
--- a/.github/workflows/unittests.yml
+++ b/.github/workflows/unittests.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-latest]
+        os: [macos-13, ubuntu-latest]
         python-version: ["3.8", "3.11"]
         bitcoind-version: ["0.18.0", "26.0"]