diff --git a/test-client/pom.xml b/test-client/pom.xml
index 2625237f..20b62478 100644
--- a/test-client/pom.xml
+++ b/test-client/pom.xml
@@ -13,7 +13,7 @@
 
     <properties>
         <kotlin.version>2.1.10</kotlin.version>
-        <jackson.version>2.21.1</jackson.version>
+        <jackson.version>2.18.6</jackson.version>
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>
     </properties>