diff --git a/.github/workflows/diagram-sync.yml b/.github/workflows/diagram-sync.yml
index 3a67eec..b79b743 100644
--- a/.github/workflows/diagram-sync.yml
+++ b/.github/workflows/diagram-sync.yml
@@ -30,10 +30,11 @@ jobs:
         with:
           node-version: '20'
 
-      - name: Install PlantUML
+      - name: Install PlantUML and Graphviz
         run: |
           sudo apt-get update -q
-          sudo apt-get install -y --no-install-recommends default-jre-headless plantuml
+          sudo apt-get install -y --no-install-recommends default-jre-headless plantuml graphviz
+          echo "GRAPHVIZ_DOT=$(which dot)" >> $GITHUB_ENV
 
       - name: Install diagram-sync
         run: npm install -g diagram-sync
@@ -70,10 +71,11 @@ jobs:
         with:
           node-version: '20'
 
-      - name: Install PlantUML
+      - name: Install PlantUML and Graphviz
         run: |
           sudo apt-get update -q
-          sudo apt-get install -y --no-install-recommends default-jre-headless plantuml
+          sudo apt-get install -y --no-install-recommends default-jre-headless plantuml graphviz
+          echo "GRAPHVIZ_DOT=$(which dot)" >> $GITHUB_ENV
 
       - name: Install diagram-sync
         run: npm install -g diagram-sync
diff --git a/pipeline.puml b/pipeline.puml
index e9e0307..dfbbd4d 100644
--- a/pipeline.puml
+++ b/pipeline.puml
@@ -2,7 +2,7 @@
 skinparam direction left to right
 skinparam backgroundColor #FAFAFA
 skinparam defaultFontName Arial
-skinparam defaultFontSize 14
+skinparam defaultFontSize 13
 skinparam ArrowColor #555555
 skinparam ArrowThickness 2
 skinparam linetype ortho