diff --git a/.gitignore b/.gitignore
index 517590e..197f868 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,7 @@ bazel-testlogs
 *.o
 protoc-gen-*
 .DS_Store
+target
+.project
+.classpath
+.settings
diff --git a/net/grpc/gateway/examples/grpc-web-java/greeter-service/pom.xml b/net/grpc/gateway/examples/grpc-web-java/greeter-service/pom.xml
index 492be75..7e507d5 100644
--- a/net/grpc/gateway/examples/grpc-web-java/greeter-service/pom.xml
+++ b/net/grpc/gateway/examples/grpc-web-java/greeter-service/pom.xml
@@ -15,21 +15,13 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.source>1.7</maven.compiler.source>
     <maven.compiler.target>1.7</maven.compiler.target>
+    <grpc.version>1.30.0</grpc.version>
+    <protobuf.version>3.12.0</protobuf.version>
     <grpc-port>7080</grpc-port>
     <grpc-web-port>8080</grpc-web-port>
   </properties>
 
   <dependencies>
-    <dependency>
-      <groupId>com.google.protobuf</groupId>
-      <artifactId>protobuf-java</artifactId>
-      <version>3.11.4</version>
-    </dependency>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <version>4.13.1</version>
-    </dependency>
     <dependency>
       <groupId>io.grpcweb</groupId>
       <artifactId>grpcweb-java</artifactId>
@@ -40,6 +32,26 @@
       <artifactId>fluent-hc</artifactId>
       <version>4.5.12</version>
     </dependency>
+    <dependency>
+      <groupId>org.apache.tomcat</groupId>
+      <artifactId>annotations-api</artifactId>
+      <version>6.0.53</version>
+      <scope>provided</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-netty-shaded</artifactId>
+      <version>${grpc.version}</version>
+      <scope>runtime</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.13.2</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>
@@ -54,11 +66,11 @@
       <plugin>
         <groupId>org.xolstice.maven.plugins</groupId>
         <artifactId>protobuf-maven-plugin</artifactId>
-        <version>0.5.0</version>
+        <version>0.6.1</version>
         <configuration>
-          <protocArtifact>com.google.protobuf:protoc:3.4.0:exe:${os.detected.classifier}</protocArtifact>
+          <protocArtifact>com.google.protobuf:protoc:${protobuf.version}:exe:${os.detected.classifier}</protocArtifact>
           <pluginId>grpc-java</pluginId>
-          <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.7.0:exe:${os.detected.classifier}</pluginArtifact>
+          <pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
         </configuration>
         <executions>
           <execution>
@@ -87,14 +99,22 @@
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.1</version>
-        <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
-        </configuration>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>1.4.1</version>
+        <executions>
+          <execution>
+            <id>enforce</id>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <requireUpperBoundDeps />
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
       </plugin>
     </plugins>
   </build>
 </project>
-
diff --git a/net/grpc/gateway/examples/grpc-web-java/interop-test-service/pom.xml b/net/grpc/gateway/examples/grpc-web-java/interop-test-service/pom.xml
index eed1a81..a685ed2 100644
--- a/net/grpc/gateway/examples/grpc-web-java/interop-test-service/pom.xml
+++ b/net/grpc/gateway/examples/grpc-web-java/interop-test-service/pom.xml
@@ -15,21 +15,36 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.source>1.7</maven.compiler.source>
     <maven.compiler.target>1.7</maven.compiler.target>
+    <grpc.version>1.30.0</grpc.version>
+    <protobuf.version>3.12.0</protobuf.version>
     <grpc-port>7080</grpc-port>
     <grpc-web-port>8080</grpc-web-port>
   </properties>
 
   <dependencies>
     <dependency>
-      <groupId>com.google.protobuf</groupId>
-      <artifactId>protobuf-java</artifactId>
-      <version>3.11.4</version>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-core</artifactId>
+      <version>${grpc.version}</version>
     </dependency>
     <dependency>
       <groupId>io.grpcweb</groupId>
       <artifactId>grpcweb-java</artifactId>
       <version>0.1-SNAPSHOT</version>
     </dependency>
+    <dependency>
+      <groupId>org.apache.tomcat</groupId>
+      <artifactId>annotations-api</artifactId>
+      <version>6.0.53</version>
+      <scope>provided</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-netty-shaded</artifactId>
+      <version>${grpc.version}</version>
+      <scope>runtime</scope>
+    </dependency>
   </dependencies>
 
   <build>
@@ -44,11 +59,11 @@
       <plugin>
         <groupId>org.xolstice.maven.plugins</groupId>
         <artifactId>protobuf-maven-plugin</artifactId>
-        <version>0.5.0</version>
+        <version>0.6.1</version>
         <configuration>
-          <protocArtifact>com.google.protobuf:protoc:3.4.0:exe:${os.detected.classifier}</protocArtifact>
+          <protocArtifact>com.google.protobuf:protoc:${protobuf.version}:exe:${os.detected.classifier}</protocArtifact>
           <pluginId>grpc-java</pluginId>
-          <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.7.0:exe:${os.detected.classifier}</pluginArtifact>
+          <pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
         </configuration>
         <executions>
           <execution>
@@ -88,9 +103,7 @@
             <configuration>
                 <archive>
                 <manifest>
-                    <mainClass>
-                      grpcweb.examples.StartServiceAndGrpcwebProxy
-                    </mainClass>
+                    <mainClass>grpcweb.examples.StartServiceAndGrpcwebProxy</mainClass>
                 </manifest>
                 </archive>
                 <descriptorRefs>
@@ -102,15 +115,22 @@
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.1</version>
-        <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
-        </configuration>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>1.4.1</version>
+        <executions>
+          <execution>
+            <id>enforce</id>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <requireUpperBoundDeps />
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
       </plugin>
     </plugins>
   </build>
 </project>
-
-
diff --git a/src/connector/pom.xml b/src/connector/pom.xml
index 5a37880..351d5a4 100644
--- a/src/connector/pom.xml
+++ b/src/connector/pom.xml
@@ -7,104 +7,73 @@
   <groupId>io.grpcweb</groupId>
   <artifactId>grpcweb-java</artifactId>
   <version>0.1-SNAPSHOT</version>
-  <name>grpcweb-java</name>
+  <name>Java gRPC-web in-process proxy</name>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.source>1.7</maven.compiler.source>
     <maven.compiler.target>1.7</maven.compiler.target>
+    <grpc.version>1.30.0</grpc.version>
   </properties>
 
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>io.grpc</groupId>
+        <artifactId>grpc-bom</artifactId>
+        <version>${grpc.version}</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
   <dependencies>
     <dependency>
-      <groupId>com.google.guava</groupId>
-      <artifactId>guava</artifactId>
-      <version>27.0.1-jre</version>
-    </dependency>
-    <dependency>
-      <groupId>com.google.protobuf</groupId>
-      <artifactId>protobuf-java</artifactId>
-      <version>3.11.4</version>
+      <groupId>org.eclipse.jetty</groupId>
+      <artifactId>jetty-server</artifactId>
+      <version>9.4.40.v20210413</version>
     </dependency>
     <dependency>
       <groupId>org.eclipse.jetty</groupId>
-      <artifactId>jetty-maven-plugin</artifactId>
-      <version>9.4.32.v20200930</version>
-    </dependency>
-    <dependency>
-      <groupId>org.eclipse.jetty</groupId>
-      <artifactId>jetty-servlets</artifactId>
-      <version>9.4.32.v20200930</version>
+      <artifactId>jetty-servlet</artifactId>
+      <version>9.4.40.v20210413</version>
     </dependency>
     <dependency>
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
-      <version>2.6</version>
+      <version>2.8.0</version>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-lang3</artifactId>
-      <version>3.10</version>
-    </dependency>
-    <dependency>
-      <groupId>io.grpc</groupId>
-      <artifactId>grpc-netty-shaded</artifactId>
-      <version>1.27.1</version>
+      <version>3.12.0</version>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-protobuf</artifactId>
-      <version>1.27.1</version>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-stub</artifactId>
-      <version>1.27.1</version>
     </dependency>
+    <dependency>
+      <groupId>com.google.inject</groupId>
+      <artifactId>guice</artifactId>
+      <version>4.2.3</version>
+    </dependency>
+
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.13.1</version>
+      <version>4.13.2</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>com.google.truth</groupId>
       <artifactId>truth</artifactId>
-      <version>1.0.1</version>
+      <version>1.1.2</version>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>com.google.inject</groupId>
-      <artifactId>guice</artifactId>
-      <version>4.1.0</version>
-    </dependency>
   </dependencies>
-
-  <build>
-    <extensions>
-      <extension>
-        <groupId>kr.motd.maven</groupId>
-        <artifactId>os-maven-plugin</artifactId>
-        <version>1.6.2</version>
-      </extension>
-    </extensions>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-jar-plugin</artifactId>
-        <version>3.2.0</version>
-      </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.1</version>
-        <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
 </project>
-
-