diff --git a/google-cloud-bigquery/pom.xml b/google-cloud-bigquery/pom.xml
index e2fffd6a9cc7..64ab9255201e 100644
--- a/google-cloud-bigquery/pom.xml
+++ b/google-cloud-bigquery/pom.xml
@@ -52,7 +52,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-compute/pom.xml b/google-cloud-compute/pom.xml
index 1dd314b81733..0f3e621367d9 100644
--- a/google-cloud-compute/pom.xml
+++ b/google-cloud-compute/pom.xml
@@ -46,7 +46,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-contrib/google-cloud-nio-examples/pom.xml b/google-cloud-contrib/google-cloud-nio-examples/pom.xml
index 94c9685c9c8e..d39cdd5c713d 100644
--- a/google-cloud-contrib/google-cloud-nio-examples/pom.xml
+++ b/google-cloud-contrib/google-cloud-nio-examples/pom.xml
@@ -23,12 +23,6 @@
       <artifactId>google-cloud-storage</artifactId>
       <version>${storage.version}</version>
     </dependency>
-
-    <dependency>
-      <groupId>org.apache.maven.plugins</groupId>
-      <artifactId>maven-assembly-plugin</artifactId>
-      <version>2.5.4</version>
-    </dependency>
   </dependencies>
   <build>
     <plugins>
diff --git a/google-cloud-contrib/google-cloud-nio/pom.xml b/google-cloud-contrib/google-cloud-nio/pom.xml
index b7640a01d983..511dfa52b2a1 100644
--- a/google-cloud-contrib/google-cloud-nio/pom.xml
+++ b/google-cloud-contrib/google-cloud-nio/pom.xml
@@ -26,12 +26,10 @@
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
-      <version>19.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
-      <version>2.0.1</version>
     </dependency>
     <dependency>
       <groupId>javax.inject</groupId>
@@ -47,19 +45,16 @@
     <dependency>
       <groupId>com.google.auto.value</groupId>
       <artifactId>auto-value</artifactId>
-      <version>1.1</version>
       <scope>provided</scope> <!-- to leave out of the all-deps jar -->
     </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava-testlib</artifactId>
-      <version>19.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-core/pom.xml b/google-cloud-core/pom.xml
index 9749ee819dff..fb7d88663634 100644
--- a/google-cloud-core/pom.xml
+++ b/google-cloud-core/pom.xml
@@ -22,12 +22,10 @@
     <dependency>
       <groupId>com.google.auth</groupId>
       <artifactId>google-auth-library-credentials</artifactId>
-      <version>${google.auth.version}</version>
     </dependency>
     <dependency>
       <groupId>com.google.auth</groupId>
       <artifactId>google-auth-library-oauth2-http</artifactId>
-      <version>${google.auth.version}</version>
       <exclusions>
         <exclusion>
           <groupId>com.google.guava</groupId>
@@ -38,24 +36,20 @@
     <dependency>
       <groupId>com.google.http-client</groupId>
       <artifactId>google-http-client</artifactId>
-      <version>1.21.0</version>
       <scope>compile</scope>
     </dependency>
     <dependency>
       <groupId>com.google.oauth-client</groupId>
       <artifactId>google-oauth-client</artifactId>
-      <version>1.21.0</version>
       <scope>compile</scope>
     </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
-      <version>19.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.api-client</groupId>
       <artifactId>google-api-client</artifactId>
-      <version>1.21.0</version>
       <scope>compile</scope>
       <exclusions>
         <exclusion>
@@ -67,7 +61,6 @@
     <dependency>
       <groupId>com.google.http-client</groupId>
       <artifactId>google-http-client-appengine</artifactId>
-      <version>1.21.0</version>
       <scope>compile</scope>
       <exclusions>
         <exclusion>
@@ -79,7 +72,6 @@
     <dependency>
       <groupId>com.google.http-client</groupId>
       <artifactId>google-http-client-jackson</artifactId>
-      <version>1.21.0</version>
       <scope>compile</scope>
       <exclusions>
         <exclusion>
@@ -91,13 +83,11 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>joda-time</groupId>
       <artifactId>joda-time</artifactId>
-      <version>2.9.2</version>
       <scope>compile</scope>
     </dependency>
     <dependency>
@@ -115,12 +105,10 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>3.2.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java-util</artifactId>
-      <version>3.2.0</version>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
@@ -146,7 +134,6 @@
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>grpc-google-common-protos</artifactId>
-      <version>0.1.7</version>
       <exclusions>
         <exclusion>
           <groupId>io.grpc</groupId>
@@ -157,7 +144,6 @@
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>grpc-google-iam-v1</artifactId>
-      <version>0.1.7</version>
       <exclusions>
         <exclusion>
           <groupId>io.grpc</groupId>
diff --git a/google-cloud-datastore/pom.xml b/google-cloud-datastore/pom.xml
index 1fd5193f8d93..ab8d3262af71 100644
--- a/google-cloud-datastore/pom.xml
+++ b/google-cloud-datastore/pom.xml
@@ -50,7 +50,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-dns/pom.xml b/google-cloud-dns/pom.xml
index f9d2e9765637..4ff0e621ee93 100644
--- a/google-cloud-dns/pom.xml
+++ b/google-cloud-dns/pom.xml
@@ -57,7 +57,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-errorreporting/pom.xml b/google-cloud-errorreporting/pom.xml
index b656fb41a00d..f99fe338a6e8 100644
--- a/google-cloud-errorreporting/pom.xml
+++ b/google-cloud-errorreporting/pom.xml
@@ -65,7 +65,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-examples/pom.xml b/google-cloud-examples/pom.xml
index 82db559ade1e..3da1b92bced0 100644
--- a/google-cloud-examples/pom.xml
+++ b/google-cloud-examples/pom.xml
@@ -28,15 +28,9 @@
       <artifactId>google-cloud-nio</artifactId>
       <version>${project.version}</version>
     </dependency>
-    <dependency>
-      <groupId>org.apache.maven.plugins</groupId>
-      <artifactId>maven-assembly-plugin</artifactId>
-      <version>2.5.4</version>
-    </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
diff --git a/google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/SubscriptionAdminClientSnippets.java b/google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/SubscriptionAdminClientSnippets.java
index 346e5566a436..2be344bea197 100644
--- a/google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/SubscriptionAdminClientSnippets.java
+++ b/google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/SubscriptionAdminClientSnippets.java
@@ -35,7 +35,7 @@
 import com.google.pubsub.v1.Subscription;
 import com.google.pubsub.v1.SubscriptionName;
 import com.google.pubsub.v1.TopicName;
-import edu.emory.mathcs.backport.java.util.Collections;
+import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 
diff --git a/google-cloud-language/pom.xml b/google-cloud-language/pom.xml
index 095637bf19b1..a3a6c3b427b7 100644
--- a/google-cloud-language/pom.xml
+++ b/google-cloud-language/pom.xml
@@ -76,7 +76,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-logging/pom.xml b/google-cloud-logging/pom.xml
index 3b7bd135f463..6bf5442d8900 100644
--- a/google-cloud-logging/pom.xml
+++ b/google-cloud-logging/pom.xml
@@ -65,7 +65,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-monitoring/pom.xml b/google-cloud-monitoring/pom.xml
index 350c486e4480..195ef72f880b 100644
--- a/google-cloud-monitoring/pom.xml
+++ b/google-cloud-monitoring/pom.xml
@@ -65,7 +65,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-pubsub/pom.xml b/google-cloud-pubsub/pom.xml
index 8e687eb68d57..da510e0ac180 100644
--- a/google-cloud-pubsub/pom.xml
+++ b/google-cloud-pubsub/pom.xml
@@ -65,7 +65,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-resourcemanager/pom.xml b/google-cloud-resourcemanager/pom.xml
index 20b7ff882f0e..8cba22f2ebd3 100644
--- a/google-cloud-resourcemanager/pom.xml
+++ b/google-cloud-resourcemanager/pom.xml
@@ -46,7 +46,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-spanner/pom.xml b/google-cloud-spanner/pom.xml
index 74b8c6e83788..e7522c9a62f6 100644
--- a/google-cloud-spanner/pom.xml
+++ b/google-cloud-spanner/pom.xml
@@ -127,48 +127,17 @@
       <artifactId>grpc-stub</artifactId>
       <version>${grpc.version}</version>
     </dependency>
-    <dependency>
-      <groupId>com.google.api</groupId>
-      <artifactId>gax</artifactId>
-      <version>${gax.version}</version>
-      <exclusions>
-        <exclusion>
-          <groupId>io.grpc</groupId>
-          <artifactId>grpc-all</artifactId>
-        </exclusion>
-      </exclusions>
-    </dependency>
     <dependency>
       <groupId>com.google.code.findbugs</groupId>
       <artifactId>jsr305</artifactId>
-      <version>3.0.0</version>
-    </dependency>
-    <dependency>
-      <groupId>com.google.guava</groupId>
-      <artifactId>guava</artifactId>
-      <version>19.0</version>
     </dependency>
     <dependency>
       <groupId>joda-time</groupId>
       <artifactId>joda-time</artifactId>
-      <version>2.9.2</version>
-    </dependency>
-    <dependency>
-      <groupId>com.google.api-client</groupId>
-      <artifactId>google-api-client</artifactId>
-      <version>1.20.0</version>
-      <exclusions>
-        <exclusion>
-          <!-- Conflicts with com.google.guava:guava -->
-          <groupId>com.google.guava</groupId>
-          <artifactId>guava-jdk5</artifactId>
-        </exclusion>
-      </exclusions>
     </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
     </dependency>
     <dependency>
       <groupId>com.google.truth</groupId>
@@ -185,13 +154,6 @@
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava-testlib</artifactId>
-      <version>19.0</version>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.json</groupId>
-      <artifactId>json</artifactId>
-      <version>20151123</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
diff --git a/google-cloud-speech/pom.xml b/google-cloud-speech/pom.xml
index daa4efc97686..be3a8be827df 100644
--- a/google-cloud-speech/pom.xml
+++ b/google-cloud-speech/pom.xml
@@ -76,7 +76,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-storage/pom.xml b/google-cloud-storage/pom.xml
index 0f1ce9826404..0f6369fe401d 100644
--- a/google-cloud-storage/pom.xml
+++ b/google-cloud-storage/pom.xml
@@ -50,7 +50,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-trace/pom.xml b/google-cloud-trace/pom.xml
index 717951355e94..448825c8c5aa 100644
--- a/google-cloud-trace/pom.xml
+++ b/google-cloud-trace/pom.xml
@@ -65,7 +65,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-translate/pom.xml b/google-cloud-translate/pom.xml
index 7087ca437a29..7046baccd1a0 100644
--- a/google-cloud-translate/pom.xml
+++ b/google-cloud-translate/pom.xml
@@ -50,7 +50,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/google-cloud-vision/pom.xml b/google-cloud-vision/pom.xml
index 6cae09bfd5b9..f5fc945af141 100644
--- a/google-cloud-vision/pom.xml
+++ b/google-cloud-vision/pom.xml
@@ -65,7 +65,6 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.12</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/pom.xml b/pom.xml
index eb6132bfa377..424723738e52 100644
--- a/pom.xml
+++ b/pom.xml
@@ -92,11 +92,15 @@
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud</site.installationModule>
 
+    <api-client.version>1.21.0</api-client.version>
+    <api-common.version>0.2.0</api-common.version>
+    <gax.version>0.12.0</gax.version>
+    <generatedProto.version>0.1.8</generatedProto.version>
     <google.auth.version>0.6.1</google.auth.version>
     <grpc.version>1.2.0</grpc.version>
-    <gax.version>0.12.0</gax.version>
-    <api-common.version>0.2.0</api-common.version>
-    <generatedProto.version>0.1.7</generatedProto.version>
+    <guava.version>19.0</guava.version>
+    <http-client.version>1.21.0</http-client.version>
+    <protobuf.version>3.2.0</protobuf.version>
 
     <cloud.version>0.13.1-alpha-SNAPSHOT</cloud.version>
     <bigquery.version>0.13.1-beta-SNAPSHOT</bigquery.version>
@@ -120,6 +124,121 @@
     <vision.version>0.13.1-beta-SNAPSHOT</vision.version>
     <testing.version>0.13.1-alpha-SNAPSHOT</testing.version>
   </properties>
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>joda-time</groupId>
+        <artifactId>joda-time</artifactId>
+        <version>2.9.2</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.code.findbugs</groupId>
+        <artifactId>jsr305</artifactId>
+        <version>3.0.0</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.protobuf</groupId>
+        <artifactId>protobuf-java</artifactId>
+        <version>${protobuf.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.protobuf</groupId>
+        <artifactId>protobuf-java-util</artifactId>
+        <version>${protobuf.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.guava</groupId>
+        <artifactId>guava</artifactId>
+        <version>${guava.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.api.grpc</groupId>
+        <artifactId>grpc-google-common-protos</artifactId>
+        <version>${generatedProto.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.api.grpc</groupId>
+        <artifactId>grpc-google-iam-v1</artifactId>
+        <version>${generatedProto.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.auto.value</groupId>
+        <artifactId>auto-value</artifactId>
+        <version>1.2</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.http-client</groupId>
+        <artifactId>google-http-client</artifactId>
+        <version>${http-client.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.http-client</groupId>
+        <artifactId>google-http-client-appengine</artifactId>
+        <version>${http-client.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.http-client</groupId>
+        <artifactId>google-http-client-jackson2</artifactId>
+        <version>${http-client.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.http-client</groupId>
+        <artifactId>google-http-client-jackson</artifactId>
+        <version>${http-client.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.oauth-client</groupId>
+        <artifactId>google-oauth-client</artifactId>
+        <version>1.21.0</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.api-client</groupId>
+        <artifactId>google-api-client-appengine</artifactId>
+        <version>${api-client.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.api-client</groupId>
+        <artifactId>google-api-client</artifactId>
+        <version>${api-client.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.auth</groupId>
+        <artifactId>google-auth-library-credentials</artifactId>
+        <version>${google.auth.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.auth</groupId>
+        <artifactId>google-auth-library-oauth2-http</artifactId>
+        <version>${google.auth.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.api</groupId>
+        <artifactId>gax</artifactId>
+        <version>${gax.version}</version>
+      </dependency>
+      <!-- test deps -->
+      <dependency>
+        <groupId>junit</groupId>
+        <artifactId>junit</artifactId>
+        <version>4.12</version>
+      </dependency>
+      <dependency>
+        <groupId>org.hamcrest</groupId>
+        <artifactId>hamcrest-core</artifactId>
+        <version>1.3</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.errorprone</groupId>
+        <artifactId>error_prone_annotations</artifactId>
+        <version>2.0.8</version>
+      </dependency>
+      <dependency>
+        <groupId>com.google.guava</groupId>
+        <artifactId>guava-testlib</artifactId>
+        <version>${guava.version}</version>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
   <modules>
     <module>google-cloud</module>
     <module>google-cloud-bigquery</module>
@@ -192,7 +311,7 @@
         <version>1.4.1</version>
         <executions>
           <execution>
-            <id>enforce-maven</id>
+            <id>enforce</id>
             <goals>
               <goal>enforce</goal>
             </goals>
@@ -204,6 +323,7 @@
                 <requireJavaVersion>
                   <version>[1.7,)</version>
                 </requireJavaVersion>
+		<dependencyConvergence/>
               </rules>
             </configuration>
           </execution>