diff --git a/build.gradle b/build.gradle
index 1376862b..86ac9d90 100644
--- a/build.gradle
+++ b/build.gradle
@@ -63,7 +63,7 @@ allprojects {
     apply plugin: 'java'
 
     compileJava.options.encoding = 'UTF-8'
-    compileJava.options.release.set 17
+    compileJava.options.release.set 21
     javadoc.options.encoding = 'UTF-8'
     javadoc.options.addStringOption('Xdoclint:none', '-quiet')
 
diff --git a/gradle.properties b/gradle.properties
index 31798459..6980da2b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,7 +1,7 @@
 org.gradle.jvmargs='-Dfile.encoding=UTF-8'
 
 org.gradle.daemon=true
-javaVersion=17
+javaVersion=21
 
 plugin_version=3.6.7
 plugin_archive=husksync