diff --git a/.github/workflows/R-CMD-full.yaml b/.github/workflows/R-CMD-full.yaml
index f791f74e..ba3a0cdc 100644
--- a/.github/workflows/R-CMD-full.yaml
+++ b/.github/workflows/R-CMD-full.yaml
@@ -27,7 +27,7 @@ jobs:
           - {os: windows-latest, r: 'oldrel'}
           - {os: macos-latest,   r: 'oldrel-1'}
           - {os: windows-latest, r: 'oldrel-1'}
-          - {os: ubuntu-20.04,   r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
+          - {os: ubuntu-20.04,   r: 'release'}
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true