diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 589994ed4..c5b58df0d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,13 +14,20 @@ jobs:
         include:
           - os: windows
             jvm: 17
+          - jvm: 21
+            jvm_url: https://download.java.net/java/early_access/jdk21/29/GPL/openjdk-21-ea+29_linux-x64_bin.tar.gz
     name: ${{ matrix.os }} / JDK${{ matrix.jvm }}
     runs-on: ${{ matrix.os }}-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: coursier/setup-action@v1
+      - if: ${{ matrix.jvm_url != '' }}
+        uses: coursier/setup-action@v1
+        with:
+          jvm: ${{ matrix.jvm_url }}
+      - if: ${{ matrix.jvm_url == '' }}
+        uses: coursier/setup-action@v1
         with:
-          jvm: temurin:${{ matrix.jvm }}
+            jvm: temurin:${{ matrix.jvm }}
       - if: ${{ matrix.os != 'windows' }}
         run: sbt test
       - if: ${{ matrix.os == 'windows' }}