diff --git a/.github/workflows/check-linux.yaml b/.github/workflows/check-linux.yaml
deleted file mode 100644
index e10b3c4..0000000
--- a/.github/workflows/check-linux.yaml
+++ /dev/null
@@ -1,61 +0,0 @@
-on: [push, pull_request]
-
-name: check-linux
-
-jobs:
-  R-CMD-check:
-    runs-on: ${{ matrix.config.os }}
-
-    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
-
-    strategy:
-      fail-fast: false
-      matrix:
-        config:
-        - { os: ubuntu-18.04, r: 'release', cran: "https://demo.rstudiopm.com/all/__linux__/bionic/latest", args: "--no-manual" }
-
-    env:
-      R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
-      CRAN: ${{ matrix.config.cran }}
-      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
-
-    steps:
-      - uses: actions/checkout@v1
-
-      - uses: r-lib/actions/setup-r@master
-        with:
-          r-version: ${{ matrix.config.r }}
-
-      - uses: r-lib/actions/setup-pandoc@master
-
-      - uses: r-lib/actions/setup-tinytex@master
-        if: contains(matrix.config.args, 'no-manual') == false
-
-      - name: Install system dependencies
-        if: runner.os == 'Linux'
-        run: |
-          sudo apt-get update -y
-          sudo apt-get install -y libglpk-dev libjq-dev libv8-dev libprotobuf-dev protobuf-compiler libudunits2-dev libgdal-dev
-
-      - name: Cache R packages
-        uses: actions/cache@v1
-        with:
-          path: ${{ env.R_LIBS_USER }}
-          key: ${{ runner.os }}-r-${{ matrix.config.r }}-${{ hashFiles('DESCRIPTION') }}
-
-      - name: Install dependencies
-        run: Rscript -e "install.packages('remotes')" -e "remotes::install_deps(dependencies = TRUE)" -e "remotes::install_cran('rcmdcheck')" -e "install.packages('igraph')" -e "install.packages('covr')"
-
-      - name: Check
-        run: Rscript -e "rcmdcheck::rcmdcheck(args = c('${{ matrix.config.args }}', '--run-donttest'), error_on = 'warning', check_dir = 'check')"
-
-      - name: Upload check results
-        if: failure()
-        uses: actions/upload-artifact@master
-        with:
-          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
-          path: check
-
-      - name: Test coverage
-        run: covr::codecov()
-        shell: Rscript {0}
diff --git a/.github/workflows/check-mac.yaml b/.github/workflows/check-mac.yaml
deleted file mode 100644
index 45c505e..0000000
--- a/.github/workflows/check-mac.yaml
+++ /dev/null
@@ -1,55 +0,0 @@
-on: [push, pull_request]
-
-name: check-mac
-
-jobs:
-  R-CMD-check:
-    runs-on: ${{ matrix.config.os }}
-
-    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
-
-    strategy:
-      fail-fast: false
-      matrix:
-        config:
-        - { os: macOS-latest, r: '4.0', args: "--no-manual" }
-
-    env:
-      R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
-      CRAN: ${{ matrix.config.cran }}
-
-    steps:
-      - uses: actions/checkout@v1
-
-      - uses: r-lib/actions/setup-r@master
-        with:
-          r-version: ${{ matrix.config.r }}
-
-      - uses: r-lib/actions/setup-pandoc@master
-
-      - uses: r-lib/actions/setup-tinytex@master
-        if: contains(matrix.config.args, 'no-manual') == false
-
-      - name: Install system dependencies
-        if: runner.os == 'macOS' && contains(matrix.config.args, 'no-manual') == false
-        run: |
-          tlmgr install pdftexcmds
-
-      - name: Cache R packages
-        uses: actions/cache@v1
-        with:
-          path: ${{ env.R_LIBS_USER }}
-          key: ${{ runner.os }}-r-${{ matrix.config.r }}-${{ hashFiles('DESCRIPTION') }}
-
-      - name: Install dependencies
-        run: Rscript -e "install.packages('remotes')" -e "remotes::install_deps(dependencies = TRUE)" -e "remotes::install_cran('rcmdcheck')"  -e "install.packages('igraph')"
-
-      - name: Check
-        run: Rscript -e "rcmdcheck::rcmdcheck(args = '${{ matrix.config.args }}', error_on = 'warning', check_dir = 'check')"
-
-      - name: Upload check results
-        if: failure()
-        uses: actions/upload-artifact@master
-        with:
-          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
-          path: check
diff --git a/.github/workflows/check-standard.yaml b/.github/workflows/check-standard.yaml
new file mode 100644
index 0000000..0528262
--- /dev/null
+++ b/.github/workflows/check-standard.yaml
@@ -0,0 +1,58 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/master/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: R-CMD-check
+
+jobs:
+  R-CMD-check:
+    runs-on: ${{ matrix.config.os }}
+
+    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
+
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - {os: macOS-latest,   r: 'release'}
+          - {os: windows-latest, r: 'release'}
+          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
+          - {os: ubuntu-latest,   r: 'release'}
+          - {os: ubuntu-latest,   r: 'oldrel-1'}
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-pandoc@v1
+
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          r-version: ${{ matrix.config.r }}
+          http-user-agent: ${{ matrix.config.http-user-agent }}
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v1
+        with:
+          extra-packages: rcmdcheck
+
+      - uses: r-lib/actions/check-r-package@v1
+
+      - name: Show testthat output
+        if: always()
+        run: find check -name 'testthat.Rout*' -exec cat '{}' \; || true
+        shell: bash
+
+      - name: Upload check results
+        if: failure()
+        uses: actions/upload-artifact@main
+        with:
+          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
+          path: check
diff --git a/.github/workflows/check-windows.yaml b/.github/workflows/check-windows.yaml
deleted file mode 100644
index 21bc5dc..0000000
--- a/.github/workflows/check-windows.yaml
+++ /dev/null
@@ -1,51 +0,0 @@
-on: [push, pull_request]
-
-name: check-windows
-
-jobs:
-  R-CMD-check:
-    runs-on: ${{ matrix.config.os }}
-
-    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
-
-    strategy:
-      fail-fast: false
-      matrix:
-        config:
-        - { os: windows-latest, r: 'release', args: "--no-manual"}
-        - { os: windows-latest, r: 'devel', args: "--no-manual"}
-
-    env:
-      R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
-      CRAN: ${{ matrix.config.cran }}
-
-    steps:
-      - uses: actions/checkout@v1
-
-      - uses: r-lib/actions/setup-r@master
-        with:
-          r-version: ${{ matrix.config.r }}
-
-      - uses: r-lib/actions/setup-pandoc@master
-
-      - uses: r-lib/actions/setup-tinytex@master
-        if: contains(matrix.config.args, 'no-manual') == false
-
-      - name: Cache R packages
-        uses: actions/cache@v1
-        with:
-          path: ${{ env.R_LIBS_USER }}
-          key: ${{ runner.os }}-r-${{ matrix.config.r }}-${{ hashFiles('DESCRIPTION') }}
-
-      - name: Install dependencies
-        run: Rscript -e "install.packages('remotes')" -e "remotes::install_deps(dependencies = TRUE)" -e "remotes::install_cran('rcmdcheck')" -e "install.packages('igraph')"
-
-      - name: Check
-        run: Rscript -e "rcmdcheck::rcmdcheck(args = '${{ matrix.config.args }}', error_on = 'note', check_dir = 'check')"
-
-      - name: Upload check results
-        if: failure()
-        uses: actions/upload-artifact@master
-        with:
-          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
-          path: check
diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
new file mode 100644
index 0000000..3c0da1c
--- /dev/null
+++ b/.github/workflows/test-coverage.yaml
@@ -0,0 +1,30 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/master/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: test-coverage
+
+jobs:
+  test-coverage:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v1
+        with:
+          extra-packages: covr
+
+      - name: Test coverage
+        run: covr::codecov()
+        shell: Rscript {0}