How to switch to the latest release version?

Question

I'm using the versions plugin to update the dependencies to my projects, where the versions are defined in properties, e.g:

<properties>
    <version.property>1.6-SNAPSHOT</version.property>
</properties>

<dependencies>
     <dependency>
         <groupId>com.foo.bar</groupId>
         <artifactId>myProject</artifactId>
         <version>${version.property}</version>
     </dependency>
</dependencies>

Now versions:update-properties is doing a good job here, but for one situation. Lets say the version.property is set to the latest snapshot version available in my repo: 1.6-SNAPSHOT.

I would expect from the following command, that the version changes to 1.5

mvn versions:update-properties

But it stays on the latest snapshot.. Now what I'm missing here? The docs claims:

...executing the update-properties goal will update the version.property property to the latest common version available in your local repository and all currently active remote repositories

The parameter allowSnapshots is false by default. So, whats going on? Why the version isn't updating to the latest release, which is 1.5? How can I do this?