diff --git a/.github/workflows/maven-build.yml b/.github/workflows/maven-build.yml
index dc00080..a6b0605 100644
--- a/.github/workflows/maven-build.yml
+++ b/.github/workflows/maven-build.yml
@@ -16,7 +16,7 @@ jobs:
       matrix:
         java: [ 11, 13 ]
     steps:
-      - uses: kamiazya/setup-graphviz@v1
+#      - uses: kamiazya/setup-graphviz@v1
       - uses: actions/checkout@v2
       - name: setup-java-${{ matrix.java }}
         uses: actions/setup-java@v1
diff --git a/.github/workflows/sonatype-deploy.yml b/.github/workflows/sonatype-deploy.yml
index 2465173..a9ac127 100644
--- a/.github/workflows/sonatype-deploy.yml
+++ b/.github/workflows/sonatype-deploy.yml
@@ -8,7 +8,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: kamiazya/setup-graphviz@v1
+#      - uses: kamiazya/setup-graphviz@v1
       - uses: actions/checkout@v2
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1