r/Clojure

I'm happy to report that CIDER 1.22 is finally out!

I meant to release this a couple of months ago, but there was always something extra I wanted to fix or include and that kept pushing the release date. Today I finally told myself that enough is enough. (plus, I liked 16.06.2026 as the release date :D )

Lots of (mostly small) improvements in this release and a TON of fixes. Check out the for all the details. For me the highlights are:

• Fixed severe editor lag in Clojure buffers with no REPL connected () — friendly-session matching is now a cheap project-dir check instead of a per-redisplay classpath scan.

• Now requires cider-nrepl 0.59+ / nREPL 1.7 — CIDER uses namespaced nREPL ops (cider/info, etc.); injected middleware was bumped accordingly.

• Pluggable jack-in tools () — register your own project tools via cider-register-jack-in-tool.

• Default session () — cider-set-default-session pins one session for all dispatch, bypassing sesman's project inference.

• nREPL transport decoupled from the UI () plus a new keyword-arg nrepl-make-eval-handler API () — nicer for extension authors (old forms kept as shims).

• Much sturdier remote/TRAMP jack-in (, , ) — remote probes via process-file, upfront command verification, no-shell ssh tunnel, and correct localhost/wildcard bind-address handling.

• Long-session stability (, , , ) — plugged request-id leaks, bounded handler tables, resilient response queue, and ssh-tunnel teardown on abnormal disconnect.

• Project detection no longer depends on clojure-mode (, ) — works in any buffer, e.g. M-x cider-connect from Dired.

• Test spinner in the mode line () while tests run.

• REPL history: crash fix + cider-repl-history-doctor () to clean up malformed entries.

• let-go runtime support ().

Big thanks to Clojurists Together, and everyone who has contributed to this release or is supporting my OSS Clojure work. You rock!