diff --git a/.github/workflows/check-bioc.yml b/.github/workflows/check-bioc.yml
index 0fed2ab..2a8283d 100644
--- a/.github/workflows/check-bioc.yml
+++ b/.github/workflows/check-bioc.yml
@@ -6,7 +6,7 @@
 name: R-CMD-check-bioc
 
 ## Specify which branches to run on
-## The "master" branch corresponds to Bioc-devel and "RELEASE_X" branches are
+## The "devel" branch corresponds to Bioc-devel and "RELEASE_X" branches are
 ## Bioconductor releases. See http://bioconductor.org/developers/how-to/git/.
 on:
   push:
@@ -153,7 +153,7 @@ jobs:
         config:
           - {os: windows-latest}
           - {os: macOS-latest}
-          - {os: ubuntu-18.04, rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
+          - {os: ubuntu-20.04, rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
       RSPM: ${{ matrix.config.rspm }}
@@ -196,7 +196,7 @@ jobs:
   test-coverage:
     ## Calculate package test coverage. Only runs if R-CMD-check-docker has
     ## completed successfully. Uses the Bioconductor Docker image.
-    if: github.ref == 'refs/heads/master'
+    if: github.ref == 'refs/heads/devel'
     needs: [get-bioc-release, get-bioc-version, R-CMD-check-docker]
     runs-on: ubuntu-latest
     container:
@@ -227,9 +227,9 @@ jobs:
 
   pkgdown:
     ## Build pkgdown site and push to gh-pages branch. Only runs if on the
-    ## master branch and R-CMD-check-docker has completed successfully. Uses
+    ## devel branch and R-CMD-check-docker has completed successfully. Uses
     ## the Bioconductor Docker image.
-    if: github.ref == 'refs/heads/master'
+    if: github.ref == 'refs/heads/devel'
     needs: [get-bioc-release, get-bioc-version, R-CMD-check-docker]
     runs-on: ubuntu-latest
     container: