diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index cba2da4e..69bb9a4e 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -16,15 +16,15 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: macOS-latest,   r: 'release'}
-          - {os: windows-latest, r: 'release'}
-          - {os: ubuntu-latest,   r: 'release'}
+          - { os: macOS-latest, r: "release" }
+          - { os: windows-latest, r: "release" }
+          - { os: ubuntu-latest, r: "release" }
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
       R_KEEP_PKG_SOURCE: yes
-      _R_CHECK_FORCE_SUGGESTS_: "0" # CRAN sets to false 
+      _R_CHECK_FORCE_SUGGESTS_: "0" # CRAN sets to false
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-pandoc@v2
 
@@ -55,11 +55,11 @@ jobs:
 
       - name: R CMD check after cmdstanr installed but before cmdstan
         uses: r-lib/actions/check-r-package@v2
-      
+
       - name: Install cmdstan
         run: |
           Rscript -e "cmdstanr::check_cmdstan_toolchain(fix = TRUE)"
           Rscript -e "cmdstanr::install_cmdstan()"
 
       - name: R CMD check after cmdstanr and cmdstan are installed
-        uses: r-lib/actions/check-r-package@v2
\ No newline at end of file
+        uses: r-lib/actions/check-r-package@v2
diff --git a/.github/workflows/pkgdown.yaml b/.github/workflows/pkgdown.yaml
index 3529f85a..5a7dee6d 100644
--- a/.github/workflows/pkgdown.yaml
+++ b/.github/workflows/pkgdown.yaml
@@ -20,7 +20,7 @@ jobs:
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-pandoc@v2
 
@@ -33,7 +33,7 @@ jobs:
           extra-packages: any::pkgdown, local::., github::stan-dev/cmdstanr
           needs: website
 
-      - name: Install and unpack cmdstan 
+      - name: Install and unpack cmdstan
         run: |
           Rscript -e "cmdstanr::check_cmdstan_toolchain(fix = TRUE)"
           Rscript -e "cmdstanr::install_cmdstan()"
@@ -48,4 +48,4 @@ jobs:
         with:
           clean: false
           branch: gh-pages
-          folder: docs
\ No newline at end of file
+          folder: docs
diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index 1eef5801..3a135cef 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -15,7 +15,7 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-r@v2
         with: