diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 445b4bf82..683022075 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -36,11 +36,14 @@ jobs:
         JOB_TYPE: test
   dependencies:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [8, 11]
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-java@v1
       with:
-        java-version: 8
+        java-version: ${{matrix.java}}
     - run: java -version
     - run: .kokoro/dependencies.sh
   linkage-monitor:
diff --git a/.kokoro/dependencies.sh b/.kokoro/dependencies.sh
index cf3bb4347..cee4f11e7 100755
--- a/.kokoro/dependencies.sh
+++ b/.kokoro/dependencies.sh
@@ -41,8 +41,10 @@ echo "****************** DEPENDENCY LIST COMPLETENESS CHECK *******************"
 ## Run dependency list completeness check
 function completenessCheck() {
   # Output dep list with compile scope generated using the original pom
+  # Running mvn dependency:list on Java versions that support modules will also include the module of the dependency.
+  # This is stripped from the output as it is not present in the flattened pom.
   msg "Generating dependency list using original pom..."
-  mvn dependency:list -f pom.xml -Dsort=true | grep '\[INFO]    .*:.*:.*:.*:.*' | grep -v ':test$' >.org-list.txt
+  mvn dependency:list -f pom.xml -Dsort=true | grep '\[INFO]    .*:.*:.*:.*:.*' | sed -e s/\\s--\\smodule.*// | grep -v ':test$' >.org-list.txt
 
   # Output dep list generated using the flattened pom (test scope deps are ommitted)
   msg "Generating dependency list using flattened pom..."
diff --git a/google-cloud-pubsub/pom.xml b/google-cloud-pubsub/pom.xml
index 63dffeb02..54fddaba8 100644
--- a/google-cloud-pubsub/pom.xml
+++ b/google-cloud-pubsub/pom.xml
@@ -144,7 +144,10 @@
           <artifactId>maven-dependency-plugin</artifactId>
           <version>3.1.2</version>
           <configuration>
-            <ignoredUnusedDeclaredDependencies>io.opencensus:opencensus-impl</ignoredUnusedDeclaredDependencies>
+            <ignoredUnusedDeclaredDependencies>
+              <ignoredUnusedDeclaredDependency>io.opencensus:opencensus-impl</ignoredUnusedDeclaredDependency>
+              <ignoredUnusedDeclaredDependency>javax.annotation:javax.annotation-api</ignoredUnusedDeclaredDependency>
+            </ignoredUnusedDeclaredDependencies>
           </configuration>
         </plugin>
       </plugins>
diff --git a/pom.xml b/pom.xml
index 0916725f1..7c98c4e0e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -126,7 +126,10 @@
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-dependency-plugin</artifactId>
           <configuration>
-            <ignoredUnusedDeclaredDependencies>org.objenesis:objenesis</ignoredUnusedDeclaredDependencies>
+            <ignoredUnusedDeclaredDependencies>
+              <ignoredUnusedDeclaredDependency>org.objenesis:objenesis</ignoredUnusedDeclaredDependency>
+              <ignoredUnusedDeclaredDependency>javax.annotation:javax.annotation-api</ignoredUnusedDeclaredDependency>
+            </ignoredUnusedDeclaredDependencies>
           </configuration>
         </plugin>
       </plugins>
diff --git a/synth.metadata b/synth.metadata
index 0293f3902..b3cc16161 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "c4f3059c27591eb24d6942a0e357ec94c80459f2"
+        "sha": "4f2c9f752a94042472fc03c5bd9e06e89817d2bd"
       }
     }
   ],