Re-download a SNAPSHOT version of a dependency using SBT?

You should try : libraryDependencies += "org. Specs2" %% "specs2" % "1.7-SNAPSHOT" % "test" changing() changing() will specify that the dependency can change and that it ivy must download it on each update. Maybe you could also try to define your repository using ivyXML.

Something like this : ivyXML := Hope this will help.

I expected that this option doesn't have to be specified but can be infered from the SNAPSHOT string. Will sbt/ivy only check the checksums and don't download again if the jar has not changed? – ziggystar Nov 22 '11 at 12:16 Ivy defines a matchingPattern that you can use when defining a resolver.

This matchingPattern gives you the ability to define a pattern (for example "*-SNAPSHOT") for artefacts that will eventually change over the time. You should try to define a resolver with this attribute using ivyXML setting, maybe SBT will consider it. – David Nov 22 '11 at 12:54.

In my opinion sbt should look everytime for a new artifact when running update (if it is a snapshot version). What happens if you exit and start sbt or if you do a reload?

In fact sbt don't all each time for a change. It would be time consuming and most of the time you don't rely on SNAPSHOTS. It's precisely the aim of changing() to specify only the resources that can change.

– David Nov 22 '11 at 12:05 @David But this (jlorenzen.blogspot.com/2007/09/…) link says that versions marked with SNAPSHOT should be downloaded/checked for each build. – ziggystar Nov 22 '11 at 12:14.

You have to clean first, to remove cached dependencies: > ;clean;update .... info downloading repo.typesafe.com/typesafe/snapshots/com... actor/2.0-SNAPSHOT/akka-actor-2.0-SNAPSHOT. Jar ... info SUCCESSFUL com.typesafe. Akka#akka-actor;2.0-SNAPSHOT!

Akka-actor. Jar (15515ms) info Done updating. That will force fetching fresh snapshots from remote repos.

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