Cannot find a spring-aspects-4 dependency

I want to upgrade my project to spring 4, however, I get a missing dependency for aspectweaver-1.8.0.M1.jar. When I take a look at the dependency hierarchy, I see that this file is needed by spring-aspects-4.0.0, which has the following in its own pom.xml

<dependency>
  <groupId>org.aspectj</groupId>
  <artifactId>aspectjweaver</artifactId>
  <version>1.8.0.M1</version>
  <scope>compile</scope>
</dependency>

After checking maven repository, I wasn't able to find this artifact since the latest stable version of aspectweaver is 1.7.4.

Now I can't understand two things:

1. Since the scope of this dependency is compile why does my application need it ? I don't want to compile the spring-aspects.jar !!

2. Why is spring-aspects-4.0.0.jar (which is stable) using a non-stable version of a component ? Wouldn't that make spring-aspects-4.0.0 also non-stable ?

Thanks