1.13.0-alpha1

Author: puredanger

content/news/2026/07/02/clojure-1-13-alpha1.adoc

@@ -0,0 +1,29 @@
+= Clojure 1.13.0-alpha1
+Alex Miller
+2026-07-02
+:jbake-type: post
+
+Clojure 1.13.0-alpha1 is now available! Find download and usage information on the <<xref/../../../../../releases/downloads#,Downloads>> page.
+
+Update your deps.edn :deps with:
+
+```org.clojure/clojure {:mvn/version "1.13.0-alpha1"}```
+
+Start a REPL with the Clojure CLI (any version) with:
+
+```clj -Sdeps '{:deps {org.clojure/clojure {:mvn/version "1.13.0-alpha1"}}}```
+
+== Checked keys
+
+You can now ensure that required keys are bound during map destructuring by using the new checked variants of the  :keys/:syms/:strs directives - :keys!/:syms!/:strs!, which will throw if the key is not present. You can also, in all directives, specify keys after & which will not be bound, for documentation or checking purposes. 
+
+* https://clojure.atlassian.net/browse/CLJ-2961[CLJ-2961] Checked keys
+* https://clojure.atlassian.net/browse/CLJ-2960[CLJ-2960] Specs for checked keys
+* https://clojure.atlassian.net/browse/CLJ-2949[CLJ-2949] req! - Variant of get that reports on key not found
+* https://clojure.atlassian.net/browse/CLJ-2954[CLJ-2954] let/loop/let* - disallow & as local binding
+
+== Other changes since Clojure 1.12.5
+
+* PersistentArrayMaps of only keyword keys now grow up to size 64 (previously was 8) before transitioning to PersistentHashMaps. PAM identity scans are more efficient than PHM lookups in this range, also makes more usage sites monomorphic and thus easier to optimize.
+* https://clojure.atlassian.net/browse/CLJ-2891[CLJ-2891] Remove ACC_FINAL designation from static initializer constants. This change was made as a prepatory step towards moving the Java bytecode baseline to address new verifier checks.
+* Runtime and test dependencies updated to latest versions

content/releases/devchangelog.adoc

@@ -17,6 +17,20 @@ The official https://github.com/clojure/clojure/blob/master/changes.md[changelog
 
 Note: All dev releases are subject to breaking changes for new work since the prior release.
 
+== Release 1.13.x
+
+=== 1.13.0-alpha1 (July 2, 2026) [[v1.13.0-alpha1]]
+
+https://clojure.org/news/2026/07/02/clojure-1-13-alpha1[Release Notes]
+
+* https://clojure.atlassian.net/browse/CLJ-2961[CLJ-2961] Checked keys
+* https://clojure.atlassian.net/browse/CLJ-2960[CLJ-2960] Specs for checked keys
+* https://clojure.atlassian.net/browse/CLJ-2949[CLJ-2949] req! - Variant of get that reports on key not found
+* https://clojure.atlassian.net/browse/CLJ-2954[CLJ-2954] let/loop/let* - disallow & as local binding
+* https://clojure.atlassian.net/browse/CLJ-2891[CLJ-2891] Remove ACC_FINAL designation from static initializer constants.
+* PersistentArrayMaps of only keyword keys now grow up to size 64 (previously was 8) before transitioning to PersistentHashMaps
+* Runtime, test, plugin dependencies updated to latest versions, including org.clojure/core.specs.alpha 0.6.87-alpha1
+
 == Release 1.12.x
 
 === 1.12.5 (May 12, 2026) [[v1.12.5]]

content/releases/downloads.adoc

@@ -54,35 +54,31 @@ Clojure depends on Java and all Clojure code is compiled to Java 8 compatible by
 Read the https://github.com/clojure/clojure/blob/master/changes.md[Changelog] for detailed release information.
 
 [[dev]]
-== Development Release: none
-
-////
+== Development Release: 1.13.0-alpha1
 
 Include the release in your project using the following coordinates:
 
 deps.edn coordinate:
 
 [source,clojure]
 ----
-org.clojure/clojure {:mvn/version "1.12.5-rc1"}
+org.clojure/clojure {:mvn/version "1.13.0-alpha1"}
 ----
 
 Leiningen dependency:
 
 [source,clojure]
 ----
-[org.clojure/clojure "1.12.5-rc1"]
+[org.clojure/clojure "1.13.0-alpha1"]
 ----
 
-* https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.clojure%22%20AND%20a%3A%22clojure%22%20AND%20v%3A1.12.5*[Clojure 1.12.5 pre-release builds]
+* https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.clojure%22%20AND%20a%3A%22clojure%22%20AND%20v%3A1.13*[Clojure 1.13 pre-release builds]
 * <<devchangelog#,Dev changelog>>
 * Dependencies:
-** `org.clojure/spec.alpha {:mvn/version "0.5.238"}`
-** `org.clojure/core.specs.alpha {:mvn/version "0.4.74"}`
+** `org.clojure/spec.alpha {:mvn/version "0.6.249"}`
+** `org.clojure/core.specs.alpha {:mvn/version "0.6.87-alpha1"}`
 * Requirements: Java 8 or higher (recommended: Java 25)
 
-////
-
 == Older Releases
 
 * For older releases, see <<downloads_older#,Older Releases>>