diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index abb8aaf..7f1262f 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -29,12 +29,12 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: macOS-latest,    r: 'release'}
+          - {os: macOS-latest,   r: 'release'}
           - {os: ubuntu-latest,   r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
           - {os: ubuntu-latest,   r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
           - {os: ubuntu-latest,   r: 'oldrel',  rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
-          - {os: macOS-latest,    r: '3.5',     rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
-          - {os: macOS-latest,    r: '3.4',     rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
+          - {os: ubuntu-latest,   r: '3.5',     rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
+          - {os: ubuntu-latest,   r: '3.4',     rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true