diff --git a/.github/workflows/graalvm.yml b/.github/workflows/graalvm.yml
index 423f5857..52af0d60 100644
--- a/.github/workflows/graalvm.yml
+++ b/.github/workflows/graalvm.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest]
-        java-version: [ '17' ]
+        java-version: [ '17', '21' ]
         distribution: [ 'graalvm-community' ]
       fail-fast: false
     name: ${{ matrix.os }} JDK ${{ matrix.java-version }}.${{ matrix.distribution }}
diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index 331bab2e..0c8d572c 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
-        java: [ '11', '17' ]
+        java: [ '11', '17', '21-ea' ]
         distribution: ['temurin']
       fail-fast: false
     name: ${{ matrix.os }} JDK ${{ matrix.java }}
diff --git a/.github/workflows/regtest.yml b/.github/workflows/regtest.yml
index 2292a9b7..ac003bb2 100644
--- a/.github/workflows/regtest.yml
+++ b/.github/workflows/regtest.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        java: [ '11', '17' ]
+        java: [ '11', '17', '21-ea' ]
         distribution: ['temurin']
       fail-fast: false
     name: ${{ matrix.os }} JDK ${{ matrix.java }}