diff --git a/opc-ua-sdk/sdk-client/src/main/java/org/eclipse/milo/opcua/sdk/client/OpcUaClient.java b/opc-ua-sdk/sdk-client/src/main/java/org/eclipse/milo/opcua/sdk/client/OpcUaClient.java
index 5bee3a46b..c2c22e6c5 100644
--- a/opc-ua-sdk/sdk-client/src/main/java/org/eclipse/milo/opcua/sdk/client/OpcUaClient.java
+++ b/opc-ua-sdk/sdk-client/src/main/java/org/eclipse/milo/opcua/sdk/client/OpcUaClient.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2025 the Eclipse Milo Authors
+ * Copyright (c) 2026 the Eclipse Milo Authors
  *
  * This program and the accompanying materials are made
  * available under the terms of the Eclipse Public License 2.0
@@ -473,6 +473,18 @@ public UInteger getRequestTimeout() {
                   });
         });
 
+    addSessionInitializer(
+        (client, session) -> {
+          // Reset before the Session is available so that the DataTypeTree and associated codecs
+          // are refreshed (eagerly or lazily, depending on configuration).
+
+          resetDataTypeTree();
+          resetDynamicDataTypeManager();
+          resetDynamicEncodingContext();
+
+          return CompletableFuture.completedFuture(Unit.VALUE);
+        });
+
     faultNotificationQueue = new ExecutionQueue(transport.getConfig().getExecutor());
 
     addressSpace = new AddressSpace(this);