ruby · rwstauner · Aug 7, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,42 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 
 ## [Unreleased]
 
+## [1.10.0] - 2026-08-07
+
+### Added
+
+- Support `version: "nearest"` to parse with the latest known Ruby version.
+- Support the no-block-parameter syntax (`&nil`) for Ruby 4.1+.
+- Allow trailing commas in method signatures ([Feature #19107]).
+- Add `Prism::ParseResult#continuable?` to determine if parsing can meaningfully continue after errors.
+- Add location slices to `Node#deconstruct_keys` for use in pattern matching.
+- Add `keyword_loc` to `ForwardingSuperNode`.
+- Many additions to the Ripper translation layer: `encoding`/`end_seen?`, `on_label_end`, `on_op`, `on_kw`, bracket/brace and string start/end events, and comments that include newlines.
+- Rust: expose parse options, line offsets, and node start offsets; add `ParseResult#is_success`/`is_failure`, `Location` line/column helpers and `chop`, and `full_name` for constant nodes.
+- Rust: ship pregenerated bindings in ruby-prism-sys so bindgen is no longer required to build, and allow custom C flags.
+- Java: split the artifact into components published to Maven Central, including a WASM parser.
+- Support precompiled native gems.
+
+### Changed
+
+- Reorganize the C API: the parser, options, buffer, and comment types are now opaque, and public headers are split from internal ones.
+- Significant lexing and parsing performance improvements: arena-based allocation, SIMD/SWAR whitespace scanning, a faster constant pool, and fast paths for ASCII identifiers.
+- Fix binding power and precedence for `not` in endless methods, `in`/`not`/`do` on and after command calls, infix operators after commands, and rescue modifiers.
+- Fix many pattern matching edge cases: trailing commas, duplicate rest patterns, hash pattern keys at EOF, and rejecting pinned back references and pinned numbered references.
+- Port the diagnostics format from CRuby.
+- Respect the `encoding` option in `Prism.lex` and use the string's encoding as the initial encoding in the Ripper translator.
+- Fix `Prism.parse_comments` locations for the FFI backend.
+- Fix lexing of unterminated strings and heredocs, and a stack-use-after-return with unterminated heredocs.
+- Track newlines in character escape sequences.
+- Correctly handle `and?` and similar on Ruby 4.0.
+- Fix the error message for block/lambda with a `...` argument.
+- Reject `END { break }` and `END { next }` for Ruby 4.0.
+- Thoroughly implement void value expression checks ([Bug #21669]).
+- Accept a nested target as the first `for` loop index.
+- Generate RBI files from RBS using rbs-inline.
+- JavaScript: fix `compactChildNodes` dropping node list fields.
+- Require arguments to `Source.for` and fix `Source#offsets` with `freeze: true`.
+
 ## [1.9.0] - 2026-01-27
 
 ### Added
@@ -753,7 +789,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 
 - 🎉 Initial release! 🎉
 
-[unreleased]: https://github.com/ruby/prism/compare/v1.9.0...HEAD
+[unreleased]: https://github.com/ruby/prism/compare/v1.10.0...HEAD
+[1.10.0]: https://github.com/ruby/prism/compare/v1.9.0...v1.10.0
 [1.9.0]: https://github.com/ruby/prism/compare/v1.8.0...v1.9.0
 [1.8.1]: https://github.com/ruby/prism/compare/v1.8.0...v1.8.1
 [1.8.0]: https://github.com/ruby/prism/compare/v1.7.0...v1.8.0

diff --git a/Gemfile.lock b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/ext/prism/extension.h b/ext/prism/extension.h
@@ -1,7 +1,7 @@
 #ifndef PRISM_EXT_NODE_H
 #define PRISM_EXT_NODE_H
 
-#define EXPECTED_PRISM_VERSION "1.9.0"
+#define EXPECTED_PRISM_VERSION "1.10.0"
 
 #include <ruby.h>
 #include <ruby/encoding.h>

diff --git a/gemfiles/2.7/Gemfile.lock b/gemfiles/2.7/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/gemfiles/3.0/Gemfile.lock b/gemfiles/3.0/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/gemfiles/3.1/Gemfile.lock b/gemfiles/3.1/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/gemfiles/3.2/Gemfile.lock b/gemfiles/3.2/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/gemfiles/3.3/Gemfile.lock b/gemfiles/3.3/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/gemfiles/3.4/Gemfile.lock b/gemfiles/3.4/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/gemfiles/4.0/Gemfile.lock b/gemfiles/4.0/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/gemfiles/4.1/Gemfile.lock b/gemfiles/4.1/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    prism (1.9.0)
+    prism (1.10.0)
 
 GEM
   remote: https://rubygems.org/

diff --git a/include/prism/version.h b/include/prism/version.h
@@ -16,7 +16,7 @@
 /**
  * The minor version of the Prism library as an int.
  */
-#define PRISM_VERSION_MINOR 9
+#define PRISM_VERSION_MINOR 10
 
 /**
  * The patch version of the Prism library as an int.
@@ -26,7 +26,7 @@
 /**
  * The version of the Prism library as a constant string.
  */
-#define PRISM_VERSION "1.9.0"
+#define PRISM_VERSION "1.10.0"
 
 /**
  * The prism version and the serialization format.

diff --git a/java/wasm/src/test/java/org/jruby/parser/prism/WASMTest.java b/java/wasm/src/test/java/org/jruby/parser/prism/WASMTest.java
@@ -77,7 +77,7 @@ public void testMBCIdentifier() {
     @Test
     public void testVersion() {
         try (Prism prism = new Prism()) {
-            assertEquals("1.9.0", prism.version());
+            assertEquals("1.10.0", prism.version());
         }
     }
 }
diff --git a/javascript/package.json b/javascript/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ruby/prism",
-  "version": "1.9.0",
+  "version": "1.10.0",
   "description": "Prism Ruby parser",
   "type": "module",
   "main": "src/index.js",

diff --git a/prism.gemspec b/prism.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name = "prism"
-  spec.version = "1.9.0"
+  spec.version = "1.10.0"
   spec.authors = ["Shopify"]
   spec.email = ["ruby@shopify.com"]
 

diff --git a/rust/Cargo.lock b/rust/Cargo.lock
diff --git a/rust/ruby-prism-sys/Cargo.toml b/rust/ruby-prism-sys/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ruby-prism-sys"
-version = "1.9.0"
+version = "1.10.0"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/ruby/prism"

diff --git a/rust/ruby-prism-sys/src/bindings.rs b/rust/ruby-prism-sys/src/bindings.rs
diff --git a/rust/ruby-prism-sys/tests/utils_tests.rs b/rust/ruby-prism-sys/tests/utils_tests.rs
@@ -9,5 +9,5 @@ fn version_test() {
         CStr::from_ptr(version)
     };
 
-    assert_eq!(&cstring.to_string_lossy(), "1.9.0");
+    assert_eq!(&cstring.to_string_lossy(), "1.10.0");
 }
diff --git a/rust/ruby-prism/Cargo.toml b/rust/ruby-prism/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ruby-prism"
-version = "1.9.0"
+version = "1.10.0"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/ruby/prism"
@@ -26,7 +26,7 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 
 [dependencies]
-ruby-prism-sys = { version = "1.9.0", path = "../ruby-prism-sys" }
+ruby-prism-sys = { version = "1.10.0", path = "../ruby-prism-sys" }
 
 [features]
 default = ["vendored"]

diff --git a/templates/java/api/src/main/java-templates/org/ruby_lang/prism/Loader.java.erb b/templates/java/api/src/main/java-templates/org/ruby_lang/prism/Loader.java.erb
@@ -82,7 +82,7 @@ public class Loader {
         expect((byte) 'M', "incorrect prism header");
 
         expect((byte) 1, "prism major version does not match");
-        expect((byte) 9, "prism minor version does not match");
+        expect((byte) 10, "prism minor version does not match");
         expect((byte) 0, "prism patch version does not match");
 
         expect((byte) 1, "Loader.java requires no location fields in the serialized output");

diff --git a/templates/javascript/src/deserialize.js.erb b/templates/javascript/src/deserialize.js.erb
@@ -1,7 +1,7 @@
 import * as nodes from "./nodes.js";
 
 const MAJOR_VERSION = 1;
-const MINOR_VERSION = 9;
+const MINOR_VERSION = 10;
 const PATCH_VERSION = 0;
 
 // The DataView getFloat64 function takes an optional second argument that

diff --git a/templates/lib/prism/serialize.rb.erb b/templates/lib/prism/serialize.rb.erb
@@ -13,7 +13,7 @@ module Prism
 
     # The minor version of prism that we are expecting to find in the serialized
     # strings.
-    MINOR_VERSION = 9
+    MINOR_VERSION = 10
 
     # The patch version of prism that we are expecting to find in the serialized
     # strings.