dependabot[bot] opened a new pull request, #15417: URL: https://github.com/apache/lucene/pull/15417
Bumps [com.ibm.icu:icu4j](https://github.com/unicode-org/icu) from 77.1 to 78.1. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/unicode-org/icu/releases";>com.ibm.icu:icu4j's releases</a>.</em></p> <blockquote> <h2>ICU 78.1</h2> <p>We are pleased to announce the release of Unicode® ICU 78. It updates to <a href="https://www.unicode.org/versions/Unicode17.0.0/";>Unicode 17</a> (<a href="https://blog.unicode.org/2025/09/unicode-170-release-announcement.html";>blog</a>), including new characters and scripts, emoji, collation & IDNA changes, and corresponding APIs and implementations.</p> <p>It also updates to <a href="https://cldr.unicode.org/downloads/cldr-48";>CLDR 48</a> (<a href="https://blog.unicode.org/2025/10/unicode-cldr-48-beta-available-for.html";>beta blog</a>) locale data with new locales, and various additions and corrections.</p> <ul> <li>Details: <a href="https://unicode-org.github.io/icu/download/78.html";>ICU 78</a>.</li> <li>Download: <a href="https://github.com/unicode-org/icu/releases/tag/release-78.1";>releases/tag/release-78.1</a></li> <li>Maven: <a href="https://mvnrepository.com/artifact/com.ibm.icu/icu4j/78.1";>com.ibm.icu / icu4j / version 78.1</a></li> </ul> <p>In Java, there is a draft new Segmenter API which is easier and safer to use than BreakIterator. In C++, there is a new set of APIs for Unicode string (UTF-8/16/32) code point iteration that works seamlessly with modern C++ iterators and ranges.</p> <p>The Java implementation of the <a href="https://www.unicode.org/reports/tr35/tr35-messageFormat.html";>CLDR MessageFormat 2.0 specification</a> has been updated to CLDR 48. The core API has been upgraded to “draft”, while the Data Model API remains in technology preview.</p> <p>The C++ implementation of MessageFormat 2.0 is at CLDR 47 level and remains in technology preview.</p> <p>ICU 78 and CLDR 48 are major releases, including a new version of Unicode and major locale data improvements.</p> <h2>ICU 78 RC</h2> <p>We are pleased to announce the release candidate for Unicode® ICU 78. It updates to <a href="https://www.unicode.org/versions/Unicode17.0.0/";>Unicode 17</a> (<a href="https://blog.unicode.org/2025/09/unicode-170-release-announcement.html";>blog</a>), including new characters and scripts, emoji, collation & IDNA changes, and corresponding APIs and implementations.</p> <p>It also updates to <a href="https://cldr.unicode.org/downloads/cldr-48";>CLDR 48</a> (<a href="https://blog.unicode.org/2025/10/unicode-cldr-48-beta-available-for.html";>beta blog</a>) locale data with new locales, and various additions and corrections.</p> <p>In Java, there is a draft new Segmenter API which is easier and safer to use than BreakIterator. In C++, there is a new set of APIs for Unicode string (UTF-8/16/32) code point iteration that works seamlessly with modern C++ iterators and ranges.</p> <p>The Java implementation of the <a href="https://www.unicode.org/reports/tr35/tr35-messageFormat.html";>CLDR MessageFormat 2.0 specification</a> has been updated to CLDR 48. The core API has been upgraded to “draft”, while the Data Model API remains in technology preview.</p> <p>The C++ implementation of MessageFormat 2.0 is at CLDR 47 level and remains in technology preview.</p> <p>ICU 78 and CLDR 48 are major releases, including a new version of Unicode and major locale data improvements.</p> <p>For details, please see <a href="https://unicode-org.github.io/icu/download/78.html";>https://unicode-org.github.io/icu/download/78.html</a>.</p> <p>Please test this release candidate on your platforms and report bugs and regressions by Monday, 2025-oct-27, via the <a href="https://icu.unicode.org/contacts";>icu-support</a> mailing list, and/or please <a href="https://icu.unicode.org/bugs";>find/submit error reports</a>.</p> <p>Please do not use this release candidate in production.</p> <p>The preliminary API reference documents are published on <a href="https://unicode-org.github.io/icu-docs/";>unicode-org.github.io/icu-docs/</a> – follow the “Dev” links there.</p> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li>See full diff in <a href="https://github.com/unicode-org/icu/commits/release-78.1";>compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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