diff --git a/testsuite/extra/pom.xml b/testsuite/extra/pom.xml
index 6f35febb5..7b6713301 100644
--- a/testsuite/extra/pom.xml
+++ b/testsuite/extra/pom.xml
@@ -30,7 +30,7 @@
   <name>SmallRye Config: Test Suite - Extra</name>
 
   <properties>
-    <kotlin.version>2.0.20</kotlin.version>
+    <kotlin.version>2.0.21</kotlin.version>
   </properties>
 
   <dependencies>