diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 8f3fdc3..54c8e29 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: macOS-latest,   r: 'release'}
+          - {os: macOS-12,   r: 'release'}
           #- {os: windows-latest, r: 'release', rtools: '42'}
           ## - {os: ubuntu-latest,   r: 'devel', rtools: '' , http-user-agent: 'release'}
           #- {os: ubuntu-latest,   r: 'release', rtools: ''}