diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index ac482cb..83a8d7d 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: macos-12,   r: 'release'}
+          - {os: macos-latest,   r: 'release'}
           - {os: windows-latest, r: 'release'}
           - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
           - {os: ubuntu-latest,   r: 'release'}
@@ -26,34 +26,41 @@ jobs:
       R_KEEP_PKG_SOURCE: yes
 
     steps:
+      # Step 1: Check out the code
       - uses: actions/checkout@v4
 
+      # Step 2: Set TAR options to suppress warnings
       - name: Set TAR options to suppress warnings
         run: echo "TAR=tar --no-same-owner" >> $GITHUB_ENV
 
+      # Step 3: Set up Pandoc
       - uses: r-lib/actions/setup-pandoc@v2
 
+      # Step 4: Set up R
       - uses: r-lib/actions/setup-r@v2
         with:
           r-version: ${{ matrix.config.r }}
           http-user-agent: ${{ matrix.config.http-user-agent }}
           use-public-rspm: true
 
-      - name: Setup Python
-        uses: actions/setup-python@v4
+      # Step 5: Set up Python
+      - uses: actions/setup-python@v5
         with:
-          python-version: '3.x'  # Use Python 3.x
+          python-version: '3.13'  # Specify Python version
 
+      # Step 6: Install Python dependencies
       - name: Install Python dependencies
         run: |
           python -m pip install --upgrade pip
           pip install numpy tensorflow keras
 
+      # Step 7: Set up R dependencies
       - uses: r-lib/actions/setup-r-dependencies@v2
         with:
           extra-packages: any::rcmdcheck
           needs: check
 
+      # Step 8: Check the R package
       - uses: r-lib/actions/check-r-package@v2
         with:
           upload-snapshots: true
diff --git a/R/run_simulations.R b/R/run_simulations.R
index ab436e3..9c4a4dd 100644
--- a/R/run_simulations.R
+++ b/R/run_simulations.R
@@ -35,3 +35,4 @@ run_simulations <- function(N, n, ndays, ncores, theta, seeds) {
 
   return(matrices)
 }
+