diff --git a/google-cloud-storage/pom.xml b/google-cloud-storage/pom.xml
index 7d8c8f99c7..e4282ce48c 100644
--- a/google-cloud-storage/pom.xml
+++ b/google-cloud-storage/pom.xml
@@ -80,14 +80,6 @@
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java-util</artifactId>
     </dependency>
-    <dependency>
-      <groupId>com.google.cloud</groupId>
-      <artifactId>google-cloud-pubsub</artifactId>
-    </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>proto-google-cloud-pubsub-v1</artifactId>
-    </dependency>
     <dependency>
       <groupId>org.threeten</groupId>
       <artifactId>threetenbp</artifactId>
@@ -159,6 +151,11 @@
       <artifactId>truth</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.google.cloud</groupId>
+      <artifactId>google-cloud-pubsub</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>org.easymock</groupId>
       <artifactId>easymock</artifactId>
diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/NotificationInfo.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/NotificationInfo.java
index 74c6e6ba2f..34c2d326d6 100644
--- a/google-cloud-storage/src/main/java/com/google/cloud/storage/NotificationInfo.java
+++ b/google-cloud-storage/src/main/java/com/google/cloud/storage/NotificationInfo.java
@@ -17,12 +17,12 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
+import com.google.api.pathtemplate.PathTemplate;
 import com.google.api.services.storage.model.Notification;
 import com.google.common.base.Function;
 import com.google.common.base.MoreObjects;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
-import com.google.pubsub.v1.ProjectTopicName;
 import java.io.Serializable;
 import java.util.List;
 import java.util.Map;
@@ -37,6 +37,8 @@
 public class NotificationInfo implements Serializable {
 
   private static final long serialVersionUID = 5725883368559753810L;
+  private static final PathTemplate PATH_TEMPLATE =
+      PathTemplate.createWithoutUrlEncoding("projects/{project}/topics/{topic}");
 
   public enum PayloadFormat {
     JSON_API_V1,
@@ -58,7 +60,7 @@ public Notification apply(NotificationInfo NotificationInfo) {
         }
       };
   private final String generatedId;
-  private final ProjectTopicName topic;
+  private final String topic;
   private final List<String> eventTypes;
   private final Map<String, String> customAttributes;
   private final PayloadFormat payloadFormat;
@@ -69,7 +71,7 @@ public Notification apply(NotificationInfo NotificationInfo) {
   public static final class Builder {
 
     private String generatedId;
-    private ProjectTopicName topic;
+    private String topic;
     private List<String> eventTypes;
     private Map<String, String> customAttributes;
     private PayloadFormat payloadFormat;
@@ -77,7 +79,7 @@ public static final class Builder {
     private String etag;
     private String selfLink;
 
-    Builder(ProjectTopicName topic) {
+    Builder(String topic) {
       this.topic = topic;
     }
 
@@ -102,7 +104,8 @@ Builder setSelfLink(String selfLink) {
       return this;
     }
 
-    public Builder setTopic(ProjectTopicName topic) {
+    /** The name of the topic. It must have the format "projects/{project}/topics/{topic}". */
+    public Builder setTopic(String topic) {
       this.topic = topic;
       return this;
     }
@@ -155,8 +158,8 @@ public String getGeneratedId() {
     return generatedId;
   }
 
-  /** Returns the Cloud PubSub topic to which this subscription publishes. */
-  public ProjectTopicName getTopic() {
+  /** Returns the topic to which this subscription publishes. */
+  public String getTopic() {
     return topic;
   }
 
@@ -248,25 +251,35 @@ Notification toPb() {
       notificationPb.setPayloadFormat(PayloadFormat.NONE.toString());
     }
     notificationPb.setSelfLink(selfLink);
-    notificationPb.setTopic(topic.toString());
+    notificationPb.setTopic(topic);
 
     return notificationPb;
   }
 
-  /** Creates a {@code NotificationInfo} object for the provided topic name. */
-  public static NotificationInfo of(ProjectTopicName topic) {
+  /**
+   * Creates a {@code NotificationInfo} object for the provided topic name.
+   *
+   * @param topic The name of the topic. It must have the format
+   *     "projects/{project}/topics/{topic}".
+   */
+  public static NotificationInfo of(String topic) {
+    PATH_TEMPLATE.validatedMatch(topic, "topic name must be in valid format");
     return newBuilder(topic).build();
   }
 
   /**
    * Returns a {@code NotificationInfo} builder where the topic's name is set to the provided name.
+   *
+   * @param topic The name of the topic. It must have the format
+   *     "projects/{project}/topics/{topic}".
    */
-  public static Builder newBuilder(ProjectTopicName topic) {
+  public static Builder newBuilder(String topic) {
+    PATH_TEMPLATE.validatedMatch(topic, "topic name must be in valid format");
     return new Builder(topic);
   }
 
   static NotificationInfo fromPb(Notification notificationPb) {
-    Builder builder = newBuilder(ProjectTopicName.parse(notificationPb.getTopic()));
+    Builder builder = newBuilder(notificationPb.getTopic());
     if (notificationPb.getId() != null) {
       builder.setGeneratedId(notificationPb.getId());
     }
@@ -283,7 +296,7 @@ static NotificationInfo fromPb(Notification notificationPb) {
       builder.setObjectNamePrefix(notificationPb.getObjectNamePrefix());
     }
     if (notificationPb.getTopic() != null) {
-      builder.setTopic(ProjectTopicName.parse(notificationPb.getTopic()));
+      builder.setTopic(notificationPb.getTopic());
     }
     if (notificationPb.getEventTypes() != null) {
       builder.setEventTypes(notificationPb.getEventTypes());
diff --git a/google-cloud-storage/src/test/java/com/google/cloud/storage/NotificationInfoTest.java b/google-cloud-storage/src/test/java/com/google/cloud/storage/NotificationInfoTest.java
index 88d5ce68b6..40b8a5ccf1 100644
--- a/google-cloud-storage/src/test/java/com/google/cloud/storage/NotificationInfoTest.java
+++ b/google-cloud-storage/src/test/java/com/google/cloud/storage/NotificationInfoTest.java
@@ -21,7 +21,6 @@
 import com.google.cloud.storage.NotificationInfo.PayloadFormat;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
-import com.google.pubsub.v1.ProjectTopicName;
 import java.util.List;
 import java.util.Map;
 import org.junit.Test;
@@ -35,7 +34,7 @@ public class NotificationInfoTest {
       ImmutableList.of("OBJECT_FINALIZE", "OBJECT_METADATA_UPDATE");
   private static final String OBJECT_NAME_PREFIX = "index.html";
   private static final PayloadFormat PAYLOAD_FORMAT = PayloadFormat.JSON_API_V1.JSON_API_V1;
-  private static final ProjectTopicName TOPIC = ProjectTopicName.of("myProject", "topic1");
+  private static final String TOPIC = "projects/myProject/topics/topic1";
   private static final Map<String, String> CUSTOM_ATTRIBUTES = ImmutableMap.of("label1", "value1");
   private static final NotificationInfo NOTIFICATION_INFO =
       NotificationInfo.newBuilder(TOPIC)
diff --git a/google-cloud-storage/src/test/java/com/google/cloud/storage/StorageImplTest.java b/google-cloud-storage/src/test/java/com/google/cloud/storage/StorageImplTest.java
index 21930a9cd2..b470ed39c1 100644
--- a/google-cloud-storage/src/test/java/com/google/cloud/storage/StorageImplTest.java
+++ b/google-cloud-storage/src/test/java/com/google/cloud/storage/StorageImplTest.java
@@ -58,7 +58,6 @@
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Iterables;
 import com.google.common.io.BaseEncoding;
-import com.google.pubsub.v1.ProjectTopicName;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
@@ -385,7 +384,7 @@ public long millisTime() {
   private static final String OBJECT_NAME_PREFIX = "index.html";
   private static final NotificationInfo.PayloadFormat PAYLOAD_FORMAT =
       NotificationInfo.PayloadFormat.JSON_API_V1.JSON_API_V1;
-  private static final ProjectTopicName TOPIC = ProjectTopicName.of("myProject", "topic1");
+  private static final String TOPIC = "projects/myProject/topics/topic1";
   private static final Map<String, String> CUSTOM_ATTRIBUTES = ImmutableMap.of("label1", "value1");
   private static final NotificationInfo NOTIFICATION_INFO_01 =
       NotificationInfo.newBuilder(TOPIC)
diff --git a/google-cloud-storage/src/test/java/com/google/cloud/storage/it/ITStorageTest.java b/google-cloud-storage/src/test/java/com/google/cloud/storage/it/ITStorageTest.java
index a42636ddd8..c3ff603837 100644
--- a/google-cloud-storage/src/test/java/com/google/cloud/storage/it/ITStorageTest.java
+++ b/google-cloud-storage/src/test/java/com/google/cloud/storage/it/ITStorageTest.java
@@ -93,7 +93,6 @@
 import com.google.iam.v1.Binding;
 import com.google.iam.v1.IAMPolicyGrpc;
 import com.google.iam.v1.SetIamPolicyRequest;
-import com.google.pubsub.v1.ProjectTopicName;
 import io.grpc.ManagedChannel;
 import io.grpc.ManagedChannelBuilder;
 import io.grpc.Metadata;
@@ -183,8 +182,9 @@ public class ITStorageTest {
   private static final String ID = UUID.randomUUID().toString().substring(0, 8);
   private static final NotificationInfo.PayloadFormat PAYLOAD_FORMAT =
       NotificationInfo.PayloadFormat.JSON_API_V1.JSON_API_V1;
-  private static final ProjectTopicName TOPIC =
-      ProjectTopicName.of(PROJECT, String.format("test_topic_foo_%s", ID));
+
+  private static final String TOPIC =
+      String.format("projects/%s/topics/test_topic_foo_%s", PROJECT, ID);
   private static final Map<String, String> CUSTOM_ATTRIBUTES = ImmutableMap.of("label1", "value1");
 
   @BeforeClass
@@ -208,11 +208,10 @@ public static void beforeClass() throws IOException {
     // Create pubsub topic for notification.
     topicAdminClient = TopicAdminClient.create();
     topicAdminClient.createTopic(TOPIC);
-    com.google.iam.v1.Policy policy = topicAdminClient.getIamPolicy(TOPIC.toString());
+    com.google.iam.v1.Policy policy = topicAdminClient.getIamPolicy(TOPIC);
     Binding binding =
         Binding.newBuilder().setRole("roles/owner").addMembers("allAuthenticatedUsers").build();
-    topicAdminClient.setIamPolicy(
-        TOPIC.toString(), policy.toBuilder().addBindings(binding).build());
+    topicAdminClient.setIamPolicy(TOPIC, policy.toBuilder().addBindings(binding).build());
 
     // Create a notification on a bucket.
     NotificationInfo notificationInfo =
@@ -3254,7 +3253,7 @@ public void testGetNotification() {
     Notification actualNotification = storage.getNotification(BUCKET, notification.getId());
     assertEquals(CUSTOM_ATTRIBUTES, actualNotification.getCustomAttributes());
     assertEquals(PAYLOAD_FORMAT.name(), actualNotification.getPayloadFormat());
-    assertTrue(actualNotification.getTopic().contains(TOPIC.toString()));
+    assertTrue(actualNotification.getTopic().contains(TOPIC));
   }
 
   @Test
@@ -3264,7 +3263,7 @@ public void testListNotification() {
       if (actualNotification.getId().equals(notification.getId())) {
         assertEquals(CUSTOM_ATTRIBUTES, actualNotification.getCustomAttributes());
         assertEquals(PAYLOAD_FORMAT.name(), actualNotification.getPayloadFormat());
-        assertTrue(actualNotification.getTopic().contains(TOPIC.toString()));
+        assertTrue(actualNotification.getTopic().contains(TOPIC));
       }
     }
   }
diff --git a/pom.xml b/pom.xml
index 4a815cf59c..e061e7fb7c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -151,16 +151,6 @@
         <artifactId>proto-google-common-protos</artifactId>
         <version>1.17.0</version>
       </dependency>
-      <dependency>
-        <groupId>com.google.cloud</groupId>
-        <artifactId>google-cloud-pubsub</artifactId>
-        <version>1.102.1</version>
-      </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>proto-google-cloud-pubsub-v1</artifactId>
-        <version>1.84.1</version>
-      </dependency>
       <dependency>
         <groupId>org.threeten</groupId>
         <artifactId>threetenbp</artifactId>
@@ -194,6 +184,12 @@
         <version>1.0.1</version>
         <scope>test</scope>
       </dependency>
+      <dependency>
+        <groupId>com.google.cloud</groupId>
+        <artifactId>google-cloud-pubsub</artifactId>
+        <version>1.102.1</version>
+        <scope>test</scope>
+      </dependency>
       <dependency>
         <groupId>org.easymock</groupId>
         <artifactId>easymock</artifactId>