diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 4595806ea..12e4343aa 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [8, 11, 17]
+        java: [8, 11, 17, 23]
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-java@v4
@@ -54,7 +54,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 11, 17]
+        java: [8, 11, 17, 23]
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-java@v4
diff --git a/google-http-client/src/test/java/com/google/api/client/http/javanet/NetHttpTransportTest.java b/google-http-client/src/test/java/com/google/api/client/http/javanet/NetHttpTransportTest.java
index 835730793..26ecd5139 100644
--- a/google-http-client/src/test/java/com/google/api/client/http/javanet/NetHttpTransportTest.java
+++ b/google-http-client/src/test/java/com/google/api/client/http/javanet/NetHttpTransportTest.java
@@ -203,14 +203,17 @@ public void testDisconnectShouldNotWaitToReadResponse() throws IOException {
           public void handle(HttpExchange httpExchange) throws IOException {
             byte[] response = httpExchange.getRequestURI().toString().getBytes();
             httpExchange.sendResponseHeaders(200, response.length);
-
-            // Sleep for longer than the test timeout
-            try {
-              Thread.sleep(100_000);
-            } catch (InterruptedException e) {
-              throw new IOException("interrupted", e);
-            }
             try (OutputStream out = httpExchange.getResponseBody()) {
+              byte[] firstByte = new byte[] {0x01};
+              out.write(firstByte);
+              out.flush();
+
+              // Sleep for longer than the test timeout
+              try {
+                Thread.sleep(100_000);
+              } catch (InterruptedException e) {
+                throw new IOException("interrupted", e);
+              }
               out.write(response);
             }
           }