Increase plan variable length in database

We use plan variables for releasing our project with Maven. Our variable contains a long string with the release command. Unfortunately this string is too long for bamboo and we cannot save the variable value.

Here is the variable value that does not fit:

org.apache.maven.plugins:maven-release-plugin:2.2:prepare org.apache.maven.plugins:maven-release-plugin:2.2:perform --batch-mode -Dtag=${bamboo.releaseTag} -DreleaseVersion=${bamboo.releaseVersion} -DdevelopmentVersion=${bamboo.nextVersion} -Dusername=bamboo -DcheckModificationExcludeList=build-number.txt

Please increase the size of the variable value. At least make sure that the input field for the value is at max as long as the database column size.