diff --git a/.github/workflows/scala.yml b/.github/workflows/scala.yml
index bad19f5..71bca58 100644
--- a/.github/workflows/scala.yml
+++ b/.github/workflows/scala.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [ '8', '11', '17' ]
+        java: [ '8', '11', '17', '21' ]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Java
diff --git a/backends/.js/src/test/scala/SqueezeNetTest.scala b/backends/.js/src/test/scala/SqueezeNetTest.scala
index fea73c3..b41373f 100644
--- a/backends/.js/src/test/scala/SqueezeNetTest.scala
+++ b/backends/.js/src/test/scala/SqueezeNetTest.scala
@@ -22,7 +22,7 @@ import cats.effect.testing.scalatest.AsyncIOSpec
 class ONNXScalaSpec extends AsyncFreeSpec with AsyncIOSpec with Matchers {
 
   import org.emergentorder.onnx.onnxruntimeNode.mod.listSupportedBackends
-  println(listSupportedBackends())
+  listSupportedBackends()
 
    implicit override def executionContext =
       scala.scalajs.concurrent.JSExecutionContext.Implicits.queue