diff --git a/.github/workflows/buildpack-integration-test.yml b/.github/workflows/buildpack-integration-test.yml
index 728f5a0f..2c320a6e 100644
--- a/.github/workflows/buildpack-integration-test.yml
+++ b/.github/workflows/buildpack-integration-test.yml
@@ -35,4 +35,4 @@ jobs:
       prerun: 'invoker/conformance/prerun.sh'
       builder-runtime: 'java17'
       builder-runtime-version: '17'
-      builder-url: gcr.io/gae-runtimes/buildpacks/google-gae-22/java/builder:latest
\ No newline at end of file
+      builder-url: gcr.io/gae-runtimes/buildpacks/google-gae-22/java/builder:latest
diff --git a/.github/workflows/conformance.yaml b/.github/workflows/conformance.yaml
index b53b1c73..f997ebd9 100644
--- a/.github/workflows/conformance.yaml
+++ b/.github/workflows/conformance.yaml
@@ -14,9 +14,7 @@ jobs:
     strategy:
       matrix:
         java: [
-          11.x
-          # 12.x,
-          # 13.x
+          11.x,
         ]
     steps:
     - name: Harden Runner
diff --git a/.github/workflows/unit.yaml b/.github/workflows/unit.yaml
index 7a7f63a6..54f15429 100644
--- a/.github/workflows/unit.yaml
+++ b/.github/workflows/unit.yaml
@@ -14,7 +14,8 @@ jobs:
       matrix:
         java: [
           11.x,
-          17.x
+          17.x,
+          21-ea
         ]
     steps:
     - name: Harden Runner
@@ -25,6 +26,8 @@ jobs:
         allowed-endpoints: >
           github.com:443
           repo.maven.apache.org:443
+          api.adoptium.net:443
+          *.githubusercontent.com:443
     - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
     - name: Set up JDK ${{ matrix.java }}
       uses: actions/setup-java@0ab4596768b603586c0de567f2430c30f5b0d2b0 # v3.13.0
diff --git a/invoker/core/src/test/java/com/google/cloud/functions/invoker/IntegrationTest.java b/invoker/core/src/test/java/com/google/cloud/functions/invoker/IntegrationTest.java
index f84ddbdd..3f3de837 100644
--- a/invoker/core/src/test/java/com/google/cloud/functions/invoker/IntegrationTest.java
+++ b/invoker/core/src/test/java/com/google/cloud/functions/invoker/IntegrationTest.java
@@ -363,6 +363,10 @@ private static int getJavaVersion() {
       if (dot != -1) {
         version = version.substring(0, dot);
       }
+      int dash = version.indexOf("-");
+      if (dash != -1) {
+        version = version.substring(0, dash);
+      }
     }
     return Integer.parseInt(version);
   }