diff --git a/.github/workflows/maven-build.yml b/.github/workflows/maven-build.yml
index 1b38e65..289b4e8 100644
--- a/.github/workflows/maven-build.yml
+++ b/.github/workflows/maven-build.yml
@@ -1,7 +1,4 @@
-# This workflow will build a Java project with Maven
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
-
-name: Java CI with Maven
+name: maven-build
 
 on:
   push:
@@ -12,11 +9,15 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 11, 15 ]
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
-      with:
-        java-version: 1.8
-    - name: Build with Maven
-      run: mvn -B package --file pom.xml
+      - uses: kamiazya/setup-graphviz@v1
+      - uses: actions/checkout@v2
+      - name: setup-jdk-${{ matrix.java }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: build-jar
+        run: mvn -B install
diff --git a/.github/workflows/sonatype-deploy.yml b/.github/workflows/sonatype-deploy.yml
index 3068ff8..bc1facd 100644
--- a/.github/workflows/sonatype-deploy.yml
+++ b/.github/workflows/sonatype-deploy.yml
@@ -9,10 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
+    - name: Set up JDK 11
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: 11
     - name: Build with Maven
       run: mvn -B package
     - name: Nexus Repo Publish