diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5bd565b..8775760 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
         jre: [17]
         os: [ubuntu-latest, windows-latest]
         include:
-          - jre: 11
+          - jre: 21
             os: ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index be4a599..cee12a0 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -28,17 +28,17 @@ jobs:
     permissions:
       contents: write
     env:
-      gh_token: ${{ secrets.GITHUB_TOKEN }}
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       ORG_GRADLE_PROJECT_nexus_user: ${{ secrets.NEXUS_USER }}
       ORG_GRADLE_PROJECT_nexus_pass64: ${{ secrets.NEXUS_PASS64 }}
       ORG_GRADLE_PROJECT_gpg_passphrase: ${{ secrets.GPG_PASSPHRASE }}
       ORG_GRADLE_PROJECT_gpg_key64: ${{ secrets.GPG_KEY64 }}
     steps:
       - uses: actions/checkout@v4
-      - name: jdk 11
+      - name: jdk 17
         uses: actions/setup-java@v4
         with:
-          java-version: 11
+          java-version: 17
           distribution: 'temurin'
       - name: gradle caching
         uses: gradle/actions/setup-gradle@v4
diff --git a/gradle.properties b/gradle.properties
index 4914cc3..ae05bc3 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -7,8 +7,8 @@ plugin_atplug_impl=com.diffplug.atplug.tooling.gradle.PlugPlugin
 plugin_atplug_name=AtPlug Gradle Plugin
 plugin_atplug_desc=Generates plugin metadata for AtPlug
 
-ver_java=8
-kotlin_jvmTarget=1.8
+ver_java=17
+kotlin_jvmTarget=17
 
 maven_group=com.diffplug.atplug
 javadoc_links=