Upgrading to GWT 2.8.1

I have a problem upgrading to GWT 2.8.1 from 2.7.0. 

Changed version of gwt in pom. Checked dependencies, updated them. Changed servlet-api version to 3.1.0. 

When I try to run application code server has an error: 

HTTP ERROR: 500

Problem accessing /. Reason:

    java.lang.NoSuchMethodError: javax.servlet.http.HttpServletResponse.getHeader(Ljava/lang/String;)Ljava/lang/String;

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From what I got, I understand that Code server trying to use wrong version of servlet-api. I see in my classpath servlet-api version 2.3, but I removed all other servlet-api versions in every dependency has it. 

I would glad to look in your recommendations. 

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