diff --git a/java-bigquery-jdbc/pom.xml b/java-bigquery-jdbc/pom.xml
index 152924230b26..ca886227ac68 100644
--- a/java-bigquery-jdbc/pom.xml
+++ b/java-bigquery-jdbc/pom.xml
@@ -83,6 +83,10 @@
                 <ignoredUsedUndeclaredDependency>org.apache.httpcomponents.*:*</ignoredUsedUndeclaredDependency>
                 <ignoredUsedUndeclaredDependency>io.grpc:*</ignoredUsedUndeclaredDependency>
             </ignoredUsedUndeclaredDependencies>
+            <ignoredUnusedDeclaredDependencies>
+                <ignoredUnusedDeclaredDependency>io.opentelemetry.contrib:opentelemetry-gcp-auth-extension</ignoredUnusedDeclaredDependency>
+                <ignoredUnusedDeclaredDependency>io.opentelemetry:opentelemetry-exporter-otlp</ignoredUnusedDeclaredDependency>
+            </ignoredUnusedDeclaredDependencies>
         </configuration>
       </plugin>
       <plugin>
@@ -424,6 +428,16 @@
       <artifactId>opentelemetry-sdk-testing</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>io.opentelemetry</groupId>
+      <artifactId>opentelemetry-sdk-logs</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>io.opentelemetry</groupId>
+      <artifactId>opentelemetry-sdk-trace</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-trace</artifactId>
diff --git a/java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcOpenTelemetry.java b/java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcOpenTelemetry.java
index 1995a4d330e4..5f35c9cde510 100644
--- a/java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcOpenTelemetry.java
+++ b/java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcOpenTelemetry.java
@@ -140,7 +140,7 @@ private BigQueryJdbcOpenTelemetry() {}
                 }));
   }
 
-  public static void ensureGlobalHandlerAttached() {
+  public static synchronized void ensureGlobalHandlerAttached() {
     Logger logger = Logger.getLogger(BIGQUERY_NAMESPACE);
     boolean present = false;
     for (Handler h : logger.getHandlers()) {
diff --git a/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcLoggingBaseTest.java b/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcLoggingBaseTest.java
index 2196363663fb..450b07a65ba8 100644
--- a/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcLoggingBaseTest.java
+++ b/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcLoggingBaseTest.java
@@ -30,10 +30,12 @@ public abstract class BigQueryJdbcLoggingBaseTest extends BigQueryJdbcBaseTest {
   private Handler handler;
   private Logger logger;
   private long threadId;
+  private java.util.logging.Level originalLevel;
 
   @BeforeEach
   public void setUpLogValidator() {
     logger = BigQueryJdbcRootLogger.getRootLogger();
+    originalLevel = logger.getLevel();
     logger.setLevel(java.util.logging.Level.ALL);
     capturedLogs.clear();
     threadId = Thread.currentThread().getId();
@@ -59,6 +61,7 @@ public void close() throws SecurityException {}
   public void tearDownLogValidator() {
     if (logger != null && handler != null) {
       logger.removeHandler(handler);
+      logger.setLevel(originalLevel);
     }
   }
 
diff --git a/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/OpenTelemetryJulHandlerTest.java b/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/OpenTelemetryJulHandlerTest.java
index 7f5f841511dd..e923dd011778 100644
--- a/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/OpenTelemetryJulHandlerTest.java
+++ b/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/OpenTelemetryJulHandlerTest.java
@@ -44,9 +44,11 @@ public class OpenTelemetryJulHandlerTest {
   static final OpenTelemetryExtension otelTesting = OpenTelemetryExtension.create();
 
   private static final Logger logger = Logger.getLogger("com.google.cloud.bigquery");
+  private java.util.logging.Level originalLevel;
 
   @BeforeEach
   public void setUp() {
+    originalLevel = logger.getLevel();
     logger.setLevel(java.util.logging.Level.ALL);
     BigQueryJdbcOpenTelemetry.ensureGlobalHandlerAttached();
   }
@@ -56,6 +58,7 @@ public void tearDown() {
     BigQueryJdbcOpenTelemetry.unregisterConnection("test-uuid");
     BigQueryJdbcOpenTelemetry.unregisterConnection("wrong-uuid");
     BigQueryJdbcOpenTelemetry.unregisterConnection("gcp-uuid");
+    logger.setLevel(originalLevel);
   }
 
   @Test
diff --git a/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/PerConnectionFileHandlerTest.java b/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/PerConnectionFileHandlerTest.java
index fda5112703fd..a1149733b113 100644
--- a/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/PerConnectionFileHandlerTest.java
+++ b/java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/PerConnectionFileHandlerTest.java
@@ -45,12 +45,15 @@ public class PerConnectionFileHandlerTest {
 
   private PerConnectionFileHandler handler;
   private BigQueryConnection mockConnection;
+  private Level originalLevel;
 
   @BeforeEach
   public void setUp() {
     handler = new PerConnectionFileHandler(tempDir.toString(), Level.INFO);
     mockConnection = Mockito.mock(BigQueryConnection.class);
     BigQueryJdbcMdc.clear();
+    originalLevel = BigQueryJdbcRootLogger.getRootLogger().getLevel();
+    BigQueryJdbcRootLogger.getRootLogger().setLevel(Level.ALL);
   }
 
   @AfterEach
@@ -59,6 +62,7 @@ public void tearDown() {
       handler.close();
     }
     BigQueryJdbcMdc.clear();
+    BigQueryJdbcRootLogger.getRootLogger().setLevel(originalLevel);
   }
 
   private Optional<Path> findLogFile(String suffix) throws IOException {