Maven dependency exception doesn't seem to work

I have a Maven project, depending on a couple of other Maven projects. I am using Spring 3.1.1 in my project and the dependent projects are 3.0.6. I am trying to exclude Spring 3.0.6 during deployment as both options are not possible. I added an explicit exception in my POM for this, but for some reason I still see the old version of the Spring kernel in the folder WEB-INF/libwhen the Tomcat server starts. Can someone point me where I am wrong. Here is mine pom.xml:

<project>
   ....
<properties>
    <org.springframework-version>3.1.1.RELEASE</org.springframework-version>
</properties>
<dependency> 
        <groupId>com.test.abc</groupId> 
        <artifactId>abc</artifactId>
         <version>1.0</version>
         <type>war</type>
        <exclusions>
            <exclusion>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
             </exclusion>
        </exclusions>            
      </dependency> 
          <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${org.springframework-version}</version>
        <exclusions>
            <!-- Exclude Commons Logging in favor of SLF4j -->
            <exclusion>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
             </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-oxm</artifactId>
        <version>3.0.4.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.ws</groupId>
        <artifactId>spring-xml</artifactId>
        <version>1.0-m2</version>
    </dependency>
        ....    
       </project>