I use the following two dependencies:

compile 'com.google.guava:guava:14.0.1'
compile 'com.google.guava:guava-gwt:14.0.1'

Both must be the same version to work correctly. Since my other dependencies use a higher version, Gradle uses different versions for each dependency.

I found this by running gradle dependencies:

compile - Compile classpath for source set 'main'.
 +--- com.google.guava:guava:14.0.1 -> 17.0
 +--- com.google.guava:guava-gwt:14.0.1
 |    +--- com.google.code.findbugs:jsr305:1.3.9
 |    \--- com.google.guava:guava:14.0.1 -> 17.0 

How can I force Gradle to set the same version for these two dependencies?