diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 26245e18..0d4af2a0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,7 +29,7 @@ jobs:
       - name: Setup Java JDK
         uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6
         with:
-          java-version: 25
+          java-version: 26
           distribution: 'corretto'
 
       - name: Setup Android SDK
@@ -82,7 +82,7 @@ jobs:
       - name: Setup Java JDK
         uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6
         with:
-          java-version: 25
+          java-version: 26
           distribution: 'corretto'
 
       - name: Setup Android SDK
diff --git a/CLAUDE.md b/CLAUDE.md
index 521cd942..add59510 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -40,7 +40,7 @@ because the alternative has cost something here.
 ./gradlew assembleRelease lintRelease # what CI gates on; runs ndk-build for both ABIs, slow
 ```
 
-Toolchain: AGP 9.3.1, Gradle 9.6.1, Java 25 toolchain, NDK pinned in `app/build.gradle`. The JDK
+Toolchain: AGP 9.4.0, Gradle 9.6.1, Java 26 toolchain, NDK pinned in `app/build.gradle`. The JDK
 and NDK are downloaded automatically. `git submodule update --init --recursive` is required
 before any native build.
 
@@ -245,7 +245,7 @@ how regressions get reintroduced.
 
 ## Modernisation
 
-Source and target level are **Java 25**. Of the modern constructs, three are in use: `var`
+Source and target level are **Java 26**. Of the modern constructs, three are in use: `var`
 (`UsbDriverService`, `XboxWirelessDongle`), records (`GameMenu.MenuOption`,
 `ComputerDetails.AddressTuple`) and switch expressions (`BrowseState`). Pattern-matching
 `instanceof` and text blocks appear nowhere yet. Nothing is known to be broken; they simply have
diff --git a/README.md b/README.md
index 54727dff..a5cd2afa 100644
--- a/README.md
+++ b/README.md
@@ -413,7 +413,7 @@ or take the signed APK artifact from a [Build workflow](.github/workflows/build.
 * Run ‘git submodule update --init --recursive’ from within moonlight-android/
 * Build the APK using Android Studio or ‘./gradlew assembleRelease’
 
-The NDK (pinned by ‘ndkVersion’ in app/build.gradle) and the JDK 25 toolchain used to
+The NDK (pinned by ‘ndkVersion’ in app/build.gradle) and the JDK 26 toolchain used to
 compile Java are both downloaded automatically. Python 3 is needed at build time for the
 patch step below, which runs from `preBuild`.
 
diff --git a/app/build.gradle b/app/build.gradle
index adc4af2c..5093d71c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -70,8 +70,8 @@ android {
     compileOptions {
         // Explicit so the build does not depend on the platform default encoding
         encoding = "UTF-8"
-        sourceCompatibility = JavaVersion.VERSION_25
-        targetCompatibility = JavaVersion.VERSION_25
+        sourceCompatibility = JavaVersion.VERSION_26
+        targetCompatibility = JavaVersion.VERSION_26
     }
 
     lint {
@@ -181,10 +181,13 @@ android {
     }
 }
 
-// Compile with JDK 25 regardless of the JDK running Gradle.
+// Compile with JDK 26 regardless of the JDK running Gradle. 26 is the newest JDK whose class files
+// (major version 70) Android Lint can read: JDK 27 output makes lint log "Unsupported class file
+// major version 71" for every class and still exit green with its bytecode checks skipped, so a
+// bump past 26 needs that re-checked, not just a green CI run.
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(25)
+        languageVersion = JavaLanguageVersion.of(26)
     }
 }
 
@@ -197,8 +200,9 @@ tasks.withType(Test).configureEach {
             .withPathSensitivity(PathSensitivity.RELATIVE)
 }
 
-// 0.8.15 is the first release that understands class file major version 69, which is what the
-// JDK 25 toolchain above emits. Older versions fail instrumentation outright.
+// 0.8.15 is the first release with official support for class file major version 70, which is
+// what the JDK 26 toolchain above emits; 0.8.14 only read it experimentally, and older versions
+// fail instrumentation outright.
 jacoco {
     toolVersion = '0.8.15'
 }
diff --git a/gradle.properties b/gradle.properties
index aacebcbe..e0e68a2b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -16,7 +16,7 @@ org.gradle.parallel=true
 org.gradle.caching=true
 
 # This project is Java-only. AGP's built-in Kotlin compiler caps jvmTarget at 24,
-# which would block the JDK 25 toolchain used for Java compilation.
+# which would block the JDK 26 toolchain used for Java compilation.
 # NOTE: AGP reports this option as deprecated. If it is removed, the Java
 # bytecode target must drop to whatever the bundled Kotlin compiler supports.
 android.builtInKotlin=false