diff --git a/build.gradle b/build.gradle
index 85f1a2b3..9f1ab378 100644
--- a/build.gradle
+++ b/build.gradle
@@ -11,7 +11,7 @@ String projectVersion = '22.3'
 String projectBranch = ''
 version = projectVersion // `version` might be modified, we don't always want that (e.g. plugin.yml)
 description = 'Provides block protection for your server.'
-sourceCompatibility = '17'
+sourceCompatibility = '21'
 
 if (System.getenv("BUILD_NUMBER") != null) {
     // Being built in Jenkins, append Build ID