Failed to Load ApplicationContext during Spring unit test

I moved from spring 3.2.0 to 4.0.3 and had to update my javax.servlet dependency (in maven) from servlet 2.5 to servlet 3.0.1. The final dependency was

       <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
       </dependency>

Then it worked