diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index 9e1fe79..e9f7e5b 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -29,9 +29,9 @@ jobs:
       matrix:
         config:
           - {os: macOS-latest,   r: 'release'}
-          - {os: ubuntu-18.04,   r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest", http-user-agent: "R/4.0.0 (ubuntu-18.04) R (4.0.0 x86_64-pc-linux-gnu x86_64 linux-gnu) on GitHub Actions" }
-          - {os: ubuntu-18.04,   r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
-          - {os: ubuntu-18.04,   r: 'oldrel',  rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
+          - {os: ubuntu-latest,   r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest", http-user-agent: "R/4.0.0 (ubuntu-18.04) R (4.0.0 x86_64-pc-linux-gnu x86_64 linux-gnu) on GitHub Actions" }
+          - {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: ubuntu-18.04,   r: '3.5',     rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
           # - {os: ubuntu-18.04,   r: '3.4',     rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}