diff --git a/fints4k/build.gradle b/fints4k/build.gradle
index 5c84f979..57890872 100644
--- a/fints4k/build.gradle
+++ b/fints4k/build.gradle
@@ -8,7 +8,7 @@ plugins {
 
 
 kotlin {
-    jvmToolchain(8)
+    jvmToolchain(11)
 
     compilerOptions {
         // suppresses compiler warning: [EXPECT_ACTUAL_CLASSIFIERS_ARE_IN_BETA_WARNING] 'expect'/'actual' classes (including interfaces, objects, annotations, enums, and 'actual' typealiases) are in Beta.