diff --git a/pom.xml b/pom.xml
index 365ff58..09b24d8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,8 +9,8 @@
     <version>0.0.5-SNAPSHOT</version>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
diff --git a/readme.md b/readme.md
index f266f1d..2a307eb 100644
--- a/readme.md
+++ b/readme.md
@@ -18,7 +18,7 @@
   
 ## building  
 **required tools**  
- - java 17 sdk  
+ - java 21 sdk  
  - git  
  - maven