diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 447cc58..df9fd56 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -17,7 +17,7 @@ jobs:
       matrix:
         config:
              #- {os: macos-latest,   r: 'release'}
-             - {os: windows-latest}
+             - {os: windows-latest, r: 'release'}
             #- {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
             #- {os: ubuntu-latest,   r: 'release'}
             #- {os: ubuntu-latest,   r: 'oldrel-1'}
diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index 0f9ee48..32b3074 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -11,10 +11,6 @@ name: test-coverage
 jobs:
   test-coverage:
     runs-on: windows-latest
-    strategy:
-      matrix:
-        r-version: ['3.6.3', '4.3.1']
-
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps: