From 8dfe4d94765cb09930f4e38a29a3ec87a175d947 Mon Sep 17 00:00:00 2001
From: GT <gregjotau@gmail.com>
Date: Fri, 18 Sep 2026 15:18:28 +0200
Subject: [PATCH] Upgrade to JDK 27

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
---
 .github/workflows/ci.yml      | 4 ++--
 .github/workflows/publish.yml | 4 ++--
 README.md                     | 6 +++---
 build.gradle.kts              | 4 ++--
 4 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a004df9..bbe194f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,8 +15,8 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-java@v5
         with:
-          distribution: oracle
-          java-version: '26'
+          distribution: liberica
+          java-version: '27'
       - uses: gradle/actions/setup-gradle@v5
       - name: Build, test, and verify publications
         run: ./gradlew clean build publishToMavenLocal
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 96d2e08..fcf282a 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -20,8 +20,8 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-java@v5
         with:
-          distribution: temurin
-          java-version: '26'
+          distribution: liberica
+          java-version: '27'
       - uses: gradle/actions/setup-gradle@v5
       - name: Check release version
         run: |
diff --git a/README.md b/README.md
index 85577e0..5cf6042 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Brev
 
-**Current Peppol, as one modular JDK 26 library.**
+**Current Peppol, as one modular JDK 27 library.**
 
 Brev is a dependency-free JVM library for constructing, writing, reading, and
 later transporting current Peppol business documents. It lives in **one
@@ -23,7 +23,7 @@ Brev occupies the opposite corner:
 
 - one repo, independently published modules;
 - current Peppol only;
-- JDK 26 baseline, no older-Java tax;
+- JDK 27 baseline, no older-Java tax;
 - typed documents instead of the full UBL schema;
 - zero third-party runtime dependencies in every published module.
 
@@ -91,7 +91,7 @@ Unsupported Peppol Billing features fail through the absence of an API.
 
 ## Building
 
-Brev requires JDK 26.
+Brev requires JDK 27.
 
 ```shell
 ./gradlew clean build
diff --git a/build.gradle.kts b/build.gradle.kts
index 9d0a832..349ee24 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -33,7 +33,7 @@ allprojects {
 subprojects {
     plugins.withId("java") {
         extensions.configure<JavaPluginExtension> {
-            toolchain.languageVersion.set(JavaLanguageVersion.of(26))
+            toolchain.languageVersion.set(JavaLanguageVersion.of(27))
         }
 
         dependencies {
@@ -43,7 +43,7 @@ subprojects {
         }
 
         tasks.withType<JavaCompile>().configureEach {
-            options.release.set(26)
+            options.release.set(27)
             options.compilerArgs.addAll(listOf("-Xlint:all", "-Werror"))
         }