diff --git a/CHANGES.txt b/CHANGES.txt
index 0b5e15a..aa605d5 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -726,6 +726,9 @@
 
     HDFS-2063. libhdfs test is broken. (Eric Yang via eli)
 
+    HDFS-2067. Bump DATA_TRANSFER_VERSION constant in trunk after introduction
+    of protocol buffers in the protocol. (szetszwo via todd)
+
 Release 0.22.0 - Unreleased
 
   INCOMPATIBLE CHANGES
diff --git a/src/java/org/apache/hadoop/hdfs/protocol/DataTransferProtocol.java b/src/java/org/apache/hadoop/hdfs/protocol/DataTransferProtocol.java
index c340804..e756f95 100644
--- a/src/java/org/apache/hadoop/hdfs/protocol/DataTransferProtocol.java
+++ b/src/java/org/apache/hadoop/hdfs/protocol/DataTransferProtocol.java
@@ -72,10 +72,10 @@
    * when protocol changes. It is not very obvious. 
    */
   /*
-   * Version 25:
-   *    Encapsulate individual operation headers.
+   * Version 26:
+   *    Use protobuf.
    */
-  public static final int DATA_TRANSFER_VERSION = 25;
+  public static final int DATA_TRANSFER_VERSION = 26;
 
   /** Operation */
   public enum Op {