diff --git a/.github/workflows/doxygen.yml b/.github/workflows/doxygen.yml
index f3756ba..f6d16b0 100644
--- a/.github/workflows/doxygen.yml
+++ b/.github/workflows/doxygen.yml
@@ -17,6 +17,9 @@ jobs:
       - name: Install Doxygen
         run: sudo apt-get install doxygen -y
 
+      - name: Install Graphviz (if needed for diagrams)
+        run: sudo apt-get install graphviz -y
+
       - name: Install LaTeX for PDF generation
         run: sudo apt-get install -y texlive-full