diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index b74a5f4..f146b81 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -21,7 +21,7 @@ jobs:
         run: shellcheck scripts/*.sh
       - uses: actions/setup-java@v5
         with:
-          java-version: 21
+          java-version: 25
           distribution: temurin
       - uses: gradle/actions/setup-gradle@v4
       - name: Run unit tests
diff --git a/build.gradle b/build.gradle
index cb763c7..5cf3207 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,17 +15,15 @@ dependencies {
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.20.0'
     compileOnly 'org.apache.spark:spark-sql_2.12:3.4.4'
 
-    testImplementation platform('org.junit:junit-bom:5.14.0')
+    testImplementation platform('org.junit:junit-bom:6.0.0')
     testImplementation 'org.junit.jupiter:junit-jupiter'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
     testImplementation 'org.assertj:assertj-core:3.27.6'
     testImplementation 'org.mockito:mockito-core:5.20.0'
 }
 
-java {
-    toolchain {
-        languageVersion = JavaLanguageVersion.of(11)
-    }
+compileJava {
+    options.release = 11
 }
 
 test {
@@ -75,7 +73,7 @@ spotless {
     }
     java {
         removeUnusedImports()
-        palantirJavaFormat('2.50.0').formatJavadoc(true)
+        palantirJavaFormat().formatJavadoc(true)
         formatAnnotations()
         licenseHeaderFile(file('license-header.txt'))
     }
diff --git a/pmd-ruleset.xml b/pmd-ruleset.xml
index 58ed2f0..9d7cef8 100644
--- a/pmd-ruleset.xml
+++ b/pmd-ruleset.xml
@@ -50,6 +50,12 @@
     <exclude name="AvoidFieldNameMatchingMethodName"/>
     <exclude name="UseProperClassLoader"/>
   </rule>
+  <rule ref="category/java/errorprone.xml/CloseResource">
+    <properties>
+      <!-- AutoCloseable was retrofitted into HttpClient only in Java 21. -->
+      <property name="allowedResourceTypes" value="java.net.http.HttpClient"/>
+    </properties>
+  </rule>
   <rule ref="category/java/multithreading.xml"/>
   <rule ref="category/java/performance.xml"/>
   <rule ref="category/java/security.xml"/>