diff --git a/build.gradle b/build.gradle
index 44d5845c..9aa0ebeb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -134,8 +134,11 @@ subprojects { subproject ->
 
 	apply from: "${rootProject.projectDir}/publish-maven.gradle"
 
-	sourceCompatibility=1.8
-	targetCompatibility=1.8
+	java {
+		toolchain {
+			languageVersion = JavaLanguageVersion.of(17)
+		}
+	}
 
 	[compileJava, compileTestJava]*.options*.compilerArgs = ["-Xlint:none"]
 
diff --git a/ide.gradle b/ide.gradle
index 1778f112..72acc2ee 100644
--- a/ide.gradle
+++ b/ide.gradle
@@ -4,8 +4,8 @@ import org.gradle.plugins.ide.eclipse.model.SourceFolder
 apply plugin: "eclipse"
 
 eclipse.jdt {
-	sourceCompatibility = 1.8
-	targetCompatibility = 1.8
+	sourceCompatibility = 17
+	targetCompatibility = 17
 }
 
 // Replace classpath entries with project dependencies (GRADLE-1116)