diff --git a/tests/tck-build-logic/src/main/groovy/org.graalvm.internal.tck-harness.gradle b/tests/tck-build-logic/src/main/groovy/org.graalvm.internal.tck-harness.gradle
index cb25627d8..e59ff5c79 100644
--- a/tests/tck-build-logic/src/main/groovy/org.graalvm.internal.tck-harness.gradle
+++ b/tests/tck-build-logic/src/main/groovy/org.graalvm.internal.tck-harness.gradle
@@ -91,6 +91,7 @@ if (project.hasProperty("baseCommit")) {
 
 def matrixDefault = [
         "version": ["17",
+                    "21"
 //                    "dev"
         ],
         "os"     : ["ubuntu-latest"] // TODO: Add support for "windows-latest", "macos-latest"