diff --git a/build.gradle b/build.gradle
index 4e6c57128948901231cd9f871b3213c99e83d2d2..32a4835d54d57e38279258795fd60930c5c75499 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,8 +18,6 @@ group = 'org.jastadd'
 // set the main class name for `gradle run`
 application.mainClassName = "${mainClassName}"
 
-java.toolchain.languageVersion = JavaLanguageVersion.of(11)
-
 repositories {
     mavenCentral()
     maven {