diff --git a/pom.xml b/pom.xml
index b269ade..706d9fd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -80,6 +80,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-dependency-plugin</artifactId>
+                <version>2.8</version>
                 <executions>
                     <execution>
                         <id>copy-dependencies</id>
@@ -99,6 +100,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-resources-plugin</artifactId>
+                <version>2.6</version>
                 <configuration>
                     <encoding>UTF-8</encoding>
                 </configuration>
@@ -106,6 +108,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
+                <version>2.2.1</version>
                 <executions>
                     <execution>
                         <id>attach-sources</id>
@@ -118,6 +121,10 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
+                <version>2.9.1</version>
+                <configuration>
+                    <encoding>UTF-8</encoding>
+                </configuration>
                 <executions>
                     <execution>
                         <id>attach-javadocs</id>
@@ -130,7 +137,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-release-plugin</artifactId>
-                <version>2.0-beta-7</version>
+                <version>2.4.1</version>
             </plugin>
         </plugins>
     </build>