diff --git a/proto/pom.xml b/proto/pom.xml
index cd4c6fc8..c004fea8 100644
--- a/proto/pom.xml
+++ b/proto/pom.xml
@@ -59,7 +59,7 @@
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
-      <version>2.3.0</version>
+      <version>2.4.0a</version>
       <scope>compile</scope>
     </dependency>