diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index 1be6710..4353268 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -16,11 +16,29 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Checkout Quarto Book
+        if: github.ref == 'refs/heads/main' 
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       - name: Checkout Pythia Book
+        if: github.ref == 'refs/heads/main' 
+        uses: actions/checkout@v4
+        with:
+          repository: tuw-geo/eo-datascience-cookbook
+          path: pythia
+          fetch-depth: 0
+          token: ${{ secrets.BOT_TOKEN }}
+          persist-credentials: true
+
+      - name: Checkout Quarto Book Branch dev
+        if: github.ref == 'refs/heads/dev' 
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Checkout Pythia Book Branch dev
+        if: github.ref == 'refs/heads/def' 
         uses: actions/checkout@v4
         with:
           repository: tuw-geo/eo-datascience-cookbook