diff --git a/org.eclipse.buildship.kotlindsl.provider/build.gradle b/org.eclipse.buildship.kotlindsl.provider/build.gradle
index 060f56e1c..70b5aba08 100644
--- a/org.eclipse.buildship.kotlindsl.provider/build.gradle
+++ b/org.eclipse.buildship.kotlindsl.provider/build.gradle
@@ -14,3 +14,9 @@ def copyLibs = tasks.register('downloadLibs', Download) {
 	username project.findProperty('gpr.user')
 	password project.findProperty('gpr.key')
 }
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17) // TODO all Gradle plugins should use Java 17 for Eclipse 4.25+
+    }
+}