diff --git a/google-cloud-asset-bom/pom.xml b/google-cloud-asset-bom/pom.xml
index c149351c7..f4c2d5fd3 100644
--- a/google-cloud-asset-bom/pom.xml
+++ b/google-cloud-asset-bom/pom.xml
@@ -110,4 +110,4 @@
       </plugin>
     </plugins>
   </build>
-</project>
\ No newline at end of file
+</project>
diff --git a/google-cloud-asset/pom.xml b/google-cloud-asset/pom.xml
index aec269d01..1d8ee5571 100644
--- a/google-cloud-asset/pom.xml
+++ b/google-cloud-asset/pom.xml
@@ -20,6 +20,14 @@
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-api</artifactId>
+      <exclusions>
+        <!-- currently collides with error_prone_annotations from grpc -->
+        <!-- TODO: try to remove after the next bump of grpc -->
+        <exclusion>
+          <groupId>com.google.errorprone</groupId>
+          <artifactId>error_prone_annotations</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
diff --git a/grpc-google-cloud-asset-v1/pom.xml b/grpc-google-cloud-asset-v1/pom.xml
index 02e352193..09e6a02ad 100644
--- a/grpc-google-cloud-asset-v1/pom.xml
+++ b/grpc-google-cloud-asset-v1/pom.xml
@@ -16,6 +16,14 @@
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-api</artifactId>
+      <exclusions>
+        <!-- currently collides with error_prone_annotations from grpc -->
+        <!-- TODO: try to remove after the next bump of grpc -->
+        <exclusion>
+          <groupId>com.google.errorprone</groupId>
+          <artifactId>error_prone_annotations</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
diff --git a/grpc-google-cloud-asset-v1beta1/pom.xml b/grpc-google-cloud-asset-v1beta1/pom.xml
index b9ba88f76..9b8b151f7 100644
--- a/grpc-google-cloud-asset-v1beta1/pom.xml
+++ b/grpc-google-cloud-asset-v1beta1/pom.xml
@@ -16,6 +16,14 @@
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-api</artifactId>
+      <exclusions>
+        <!-- currently collides with error_prone_annotations from grpc -->
+        <!-- TODO: try to remove after the next bump of grpc -->
+        <exclusion>
+          <groupId>com.google.errorprone</groupId>
+          <artifactId>error_prone_annotations</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
diff --git a/grpc-google-cloud-asset-v1p2beta1/pom.xml b/grpc-google-cloud-asset-v1p2beta1/pom.xml
index ab92d0ede..037197299 100644
--- a/grpc-google-cloud-asset-v1p2beta1/pom.xml
+++ b/grpc-google-cloud-asset-v1p2beta1/pom.xml
@@ -16,6 +16,14 @@
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-api</artifactId>
+      <exclusions>
+        <!-- currently collides with error_prone_annotations from grpc -->
+        <!-- TODO: try to remove after the next bump of grpc -->
+        <exclusion>
+          <groupId>com.google.errorprone</groupId>
+          <artifactId>error_prone_annotations</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
diff --git a/pom.xml b/pom.xml
index ed835b96e..483356dac 100644
--- a/pom.xml
+++ b/pom.xml
@@ -71,7 +71,7 @@
     <grpc.version>1.26.0</grpc.version>
     <protobuf.version>3.11.1</protobuf.version>
     <junit.version>4.13</junit.version>
-    <guava.version>28.1-android</guava.version>
+    <guava.version>28.2-android</guava.version>
     <threeten.version>1.4.0</threeten.version>
     <javax.annotations.version>1.3.2</javax.annotations.version>
     <animal-sniffer.version>1.18</animal-sniffer.version>
@@ -222,6 +222,30 @@
             <ignoredUnusedDeclaredDependencies>org.objenesis:objenesis</ignoredUnusedDeclaredDependencies>
           </configuration>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-enforcer-plugin</artifactId>
+          <version>3.0.0-M3</version>
+          <executions>
+            <execution>
+              <id>enforce</id>
+              <goals>
+                <goal>enforce</goal>
+              </goals>
+              <configuration>
+                <rules>
+                  <requireMavenVersion>
+                    <version>[3.0,)</version>
+                  </requireMavenVersion>
+                  <requireJavaVersion>
+                    <version>[1.7,)</version>
+                  </requireJavaVersion>
+                  <requireUpperBoundDeps/>
+                </rules>
+              </configuration>
+            </execution>
+          </executions>
+        </plugin>
       </plugins>
     </pluginManagement>
   </build>