diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 2582c2cf..54574e69 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -24,6 +24,7 @@ jobs:
           - { javaVersion: '8',  container: "cassandra-latest",  scalaVersion: "++3.3", test: "test" }
           - { javaVersion: '11', container: "cassandra-latest",  scalaVersion: "++2.12", test: "test" }
           - { javaVersion: '11', container: "cassandra-latest",  scalaVersion: "++2.13", test: "test" }
+          - { javaVersion: '21', container: "cassandra-latest",  scalaVersion: "++2.13", test: "test" }
           - { javaVersion: '8',  container: "cassandra-latest",  scalaVersion: "++3.3", test: "test" }
           - { javaVersion: '11', container: "cassandra2",        scalaVersion: "++2.13", test: "'testOnly -- -l RequiresCassandraThree'"}
           - { javaVersion: '11', container: "cassandra3",        scalaVersion: "++2.13", test: "test" }