diff --git a/.github/workflows/main-05-R-CMD-check-linux.yml b/.github/workflows/main-05-R-CMD-check-linux.yml
index f9cd750c..7f5c4394 100644
--- a/.github/workflows/main-05-R-CMD-check-linux.yml
+++ b/.github/workflows/main-05-R-CMD-check-linux.yml
@@ -22,7 +22,7 @@ jobs:
       max-parallel: 1
       matrix:
         config:
-          - {os: ubuntu-16.04,   r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/xenial/latest"}
+          - {os: ubuntu-18.04, r: 'release'}
           
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true