How to upgrade nrepl version of leiningen?

Question

I'm using leiningen and emacs + cider for clojure development. A few days ago, after I upgrade cider through emacs package manager, I'm getting the following warning message when I run M-x cider-connect or M-x cider-jack-in.

; CIDER 0.9.0snapshot (package: 20150222.137) (Java 1.8.0_31, Clojure 1.6.0, nREPL 0.2.6)
WARNING: CIDER requires nREPL 0.2.7 to work properly
user> 

The warning message clearly says that I have to upgrade nrepl to 0.2.7, however, I don't know how.

I installed leiningen via brew, and it uses nrepl 0.2.6.

$ lein repl
nREPL server started on port 53218 on host 127.0.0.1 - nrepl://127.0.0.1:53218
REPL-y 0.3.5, nREPL 0.2.6
Clojure 1.6.0
Java HotSpot(TM) 64-Bit Server VM 1.8.0_31-b13
    Docs: (doc function-name-here)
          (find-doc "part-of-name-here")
  Source: (source function-name-here)
 Javadoc: (javadoc java-object-or-class-here)
    Exit: Control+D or (exit) or (quit)
 Results: Stored in vars *1, *2, *3, an exception in *e

user=>

The content of leiningen profile is:

{:user {:plugins [[cider/cider-nrepl "0.9.0-SNAPSHOT"]]}}

Question:: How to upgrade the version of nrepl used by leiningen?

Answer 1

I've just had this problem, and I solved it by adding an explicit dependency on the newer version of tools.nrepl to profiles.clj. My ~/.lein/profiles.clj:

{:repl {:plugins [[cider/cider-nrepl "0.9.0-SNAPSHOT"]]
        :dependencies [[org.clojure/tools.nrepl "0.2.7"]]}}

No idea whether that's the best or official way to do it, tho'.

Answer 2

an additional note on top of @matthew-moss's: the tools.nrepl dependency line is only used if you run lein repl from within a clojure project. if you just run lein repl from your home directory, for example, you end up using the version of tools.nrepl that is compiled into leiningen. No idea why.

Hope that saves somebody time.

Answer 3

lein has an upgrade command so in the simplest case

lein upgrade

In case you installed leiningen with a package manager you might need to do something like the below (example for OS X, linux distros have their own wonderful package managers):

brew unlink leiningen
brew update
brew install leiningen

Answer 4

As an addition to the accepted answer: adding dependency on 0.2.7 in user profiles.clj worked for me some days ago but then suddenly I got back to the 0.2.6 warning. Asking "lein deps :tree" had this line in it:

[org.clojure/tools.nrepl "0.2.7" :scope "test" :exclusions [[org.clojure/clojure]]]

Which gave me a clue that probably the lein-test-refresh plugin (defined in the same profiles.clj) is causing some confusion here. Reading some more about profiles I learnt about the ^:replace hint. This line in dependencies works now for me:

^:replace [org.clojure/tools.nrepl "0.2.7"]