You can by specifying the spring.version
property, assuming that you use the spring-boot-starter
as a parent.
<properties>
<spring.version>your-version-here</spring.version>
</properties>
If it is wise is an entirely different question (there is code in Spring Boot that assumes certain things to be available and to make sure that it works you would at least have to use Spring version 4.0.3 I guess.