diff --git a/.github/workflows/basic-workflow.yml b/.github/workflows/basic-workflow.yml
index f85d0cd..8fabac4 100644
--- a/.github/workflows/basic-workflow.yml
+++ b/.github/workflows/basic-workflow.yml
@@ -1,17 +1,23 @@
 name: Continuous integration example
 
 on: 
-  push:
+  workflow_dispatch:
 
 jobs:
 
   test:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+     fail-fast: false
+     matrix:
+       os: [ macos-latest, windows-latest, ubuntu-latest ]
+       java: [ '11', '17', '21']
+    name: Java ${{ matrix.java }} sample
     steps:
-      - uses: actions/checkout@v6
-      - name: Set up JDK 21
-        uses: actions/setup-java@v5
+      - uses: actions/checkout@v4
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@v4
         with:
-          distribution: 'temurin'
-          java-version: '21'
-      - run: mvn test
+          distribution: 'adopt'
+          java-version: ${{ matrix.java }}
+      - run: mvn test
\ No newline at end of file