updated tycho to 0.21.0
diff --git a/releng/mvn-jwt-builder/pom.xml b/releng/mvn-jwt-builder/pom.xml
index 90b5716..98662d2 100644
--- a/releng/mvn-jwt-builder/pom.xml
+++ b/releng/mvn-jwt-builder/pom.xml
@@ -41,7 +41,7 @@
   </modules>
 
   <properties>
-    <tycho-version>0.18.0</tycho-version>
+    <tycho-version>0.21.0</tycho-version>
     <maven.build.timestamp.format>yyyyMMdd-HHmm</maven.build.timestamp.format>
     <download-publish-path>/home/data/httpd/download.eclipse.org/jwt/</download-publish-path>
   </properties>