diff --git a/lib/build.gradle.kts b/lib/build.gradle.kts
index a63f60b..c905fe5 100644
--- a/lib/build.gradle.kts
+++ b/lib/build.gradle.kts
@@ -14,7 +14,7 @@ java {
     withJavadocJar()
     withSourcesJar()
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(17))
+        languageVersion.set(JavaLanguageVersion.of(11))
     }
 }