diff --git a/.idea/misc.xml b/.idea/misc.xml
index 339a05a..6a250b7 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" project-jdk-name="12" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_12" default="false" project-jdk-name="11" project-jdk-type="JavaSDK" />
 </project>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 44980d5..4e23d72 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ plugins {
 
 group = 'ch.zli.m223'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '12'
+sourceCompatibility = '11'
 
 configurations {
 	developmentOnly