upgraded plugins
diff --git a/pom.xml b/pom.xml
index bb9d7a3..a37e0d8 100755
--- a/pom.xml
+++ b/pom.xml
@@ -163,42 +163,42 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.2</version>
+                    <version>3.5.1</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-jar-plugin</artifactId>
-                    <version>2.5</version>
+                    <version>3.0.2</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-source-plugin</artifactId>
-                    <version>2.4</version>
+                    <version>3.0.1</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-javadoc-plugin</artifactId>
-                    <version>2.10.1</version>
+                    <version>2.10.4</version>
                 </plugin>
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>cobertura-maven-plugin</artifactId>
-                    <version>2.5.2</version>
+                    <version>2.7</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-failsafe-plugin</artifactId>
-                    <version>2.18.1</version>
+                    <version>2.19.1</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-surefire-plugin</artifactId>
-                    <version>2.18.1</version>
+                    <version>2.19.1</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-surefire-report-plugin</artifactId>
-                    <version>2.18.1</version>
+                    <version>2.19.1</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
@@ -208,22 +208,22 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-site-plugin</artifactId>
-                    <version>3.4</version>
+                    <version>3.5.1</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-project-info-reports-plugin</artifactId>
-                    <version>2.8</version>
+                    <version>2.9</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-pmd-plugin</artifactId>
-                    <version>3.4</version>
+                    <version>3.6</version>
                 </plugin>
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>versions-maven-plugin</artifactId>
-                    <version>2.1</version>
+                    <version>2.3</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
@@ -233,7 +233,7 @@
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>findbugs-maven-plugin</artifactId>
-                    <version>3.0.0</version>
+                    <version>3.0.4</version>
                 </plugin>
             </plugins>
         </pluginManagement>