diff --git a/build.gradle b/build.gradle
index e47adf3..6711840 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,7 +14,7 @@ description = """BibleClassOrganizer"""
 
 java {
 	toolchain {
-		languageVersion = JavaLanguageVersion.of(17)
+		languageVersion = JavaLanguageVersion.of(21)
 	}
 }