diff --git a/clients/kotlin/pom.xml b/clients/kotlin/pom.xml
index 4afa367..63937d9 100644
--- a/clients/kotlin/pom.xml
+++ b/clients/kotlin/pom.xml
@@ -9,7 +9,7 @@
     <name>aicup2019</name>
 
     <properties>
-        <kotlin.version>1.3.11</kotlin.version>
+        <kotlin.version>1.6.0</kotlin.version>
         <main.class>Runner</main.class>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>