diff --git a/opbeans/pom.xml b/opbeans/pom.xml
index 5370662..acc5075 100644
--- a/opbeans/pom.xml
+++ b/opbeans/pom.xml
@@ -51,7 +51,7 @@
 			<dependency>
 				<groupId>org.jetbrains.kotlin</groupId>
 				<artifactId>kotlin-stdlib</artifactId>
-				<version>1.4.0</version>
+				<version>1.9.21</version>
 			</dependency>
 			<dependency>
 				<groupId>org.jetbrains.kotlin</groupId>