diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 9e47735..fd8cabf 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -18,8 +18,8 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: macos-latest,   r: 'release'}
-          - {os: windows-latest, r: 'release'}
+#          - {os: macos-latest,   r: 'release'}
+#          - {os: windows-latest, r: 'release'}
           - {os: ubuntu-latest,   r: 'release'}
 
     env: