diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 253882b..2cd3150 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v1
         with:
-          java-version: 17
+          java-version: 21
       - name: Install GLPK and CBC
         run: sudo apt install glpk-utils coinor-cbc libglpk-java
       - name: Run tests