diff --git a/pom.xml b/pom.xml
index c6ae9c7..c176df5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,16 +15,20 @@
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
         <poi.version>5.2.3</poi.version>
-        <jt400.version>10.7</jt400.version>
+        <!-- Same JTOpen as /QIBM/ProdData/OS400/jt400/lib/jt400Native.jar on the server. -->
+        <jt400.version>21.0.6</jt400.version>
         <json.version>20231013</json.version>
         <servlet.version>4.0.1</servlet.version>
     </properties>
 
     <dependencies>
+        <!-- Provided by IAS (ERPAPIS server.xml: classloader commonLibraryRef="IntegratedWebServicesLibs").
+             Only one classloader per JVM may own jt400's native library, so it must not be bundled. -->
         <dependency>
             <groupId>net.sf.jt400</groupId>
             <artifactId>jt400</artifactId>
             <version>${jt400.version}</version>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.apache.poi</groupId>