diff --git a/.github/workflows/comprehensive.yml b/.github/workflows/comprehensive.yml
index ea92b71..eec32fb 100644
--- a/.github/workflows/comprehensive.yml
+++ b/.github/workflows/comprehensive.yml
@@ -43,7 +43,7 @@ jobs:
         config:
           - {os: windows-latest, r: 'release'}
           - {os: macOS-latest, r: 'release'}
-          - {os: ubuntu-20.04, r: '3.6.3'}
+          - {os: ubuntu-20.04, r: '4.0.5'}
     steps:
       - uses: actions/checkout@v4
       - uses: r-lib/actions/setup-r@v2-branch
diff --git a/cran-comments.md b/cran-comments.md
index 852192e..7ffce35 100644
--- a/cran-comments.md
+++ b/cran-comments.md
@@ -8,7 +8,7 @@
 * GitHub Actions
     * windows-latest (release)
     * macOS-latest (release)
-    * ubuntu-20.04 (3.6.3)
+    * ubuntu-20.04 (4.0.5)
 
 ## R CMD check results