diff --git a/.Rbuildignore b/.Rbuildignore
deleted file mode 100644
index 620d99d..0000000
--- a/.Rbuildignore
+++ /dev/null
@@ -1,6 +0,0 @@
-^.*\.Rproj$
-^\.Rproj\.user$
-^Readme.md
-^cran-comments.md
-^LICENSE\.md$
-^\.github/workflows$
diff --git a/.github/workflows/check-mac.yaml b/.github/workflows/check-mac.yaml
index bc278fd..8ff8cb6 100644
--- a/.github/workflows/check-mac.yaml
+++ b/.github/workflows/check-mac.yaml
@@ -12,7 +12,7 @@
       fail-fast: false
       matrix:
         config:
-        - { os: macOS-latest, r: '3.6' }
+        - { os: macOS-latest, r: '4.0' }
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
diff --git a/.github/workflows/check-windows.yaml b/.github/workflows/check-windows.yaml
index add6c53..fac7a07 100644
--- a/.github/workflows/check-windows.yaml
+++ b/.github/workflows/check-windows.yaml
@@ -12,7 +12,7 @@
       fail-fast: false
       matrix:
         config:
-        - { os: windows-latest, r: '3.6', args: "--no-manual"}
+        - { os: windows-latest, r: '4.0', args: "--no-manual"}
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true