diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 2f4bf16aa..66b230374 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -19,9 +19,9 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          # - {os: windows-latest, r: 'release'}
-          # - {os: windows-latest, r: 'devel'}
-          # - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
+          - {os: windows-latest, r: 'release'}
+          - {os: windows-latest, r: 'devel'}
+          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
           - {os: macos-latest, r: 'devel'}
 
     env: