diff --git a/project.properties b/project.properties
index 14e0aa1e9..63b1f23b1 100644
--- a/project.properties
+++ b/project.properties
@@ -46,7 +46,7 @@ maven.javadoc.overview=./src/java/org/apache/commons/lang/overview.html
 # This links to the current stable version. We could have LANG_CURRENT, but this 
 # is simpler to manage at the moment.
 maven.jdiff.new.tag=CURRENT
-maven.jdiff.old.tag=LANG_2_1
+maven.jdiff.old.tag=LANG_2_3
 
 # Generate class files for specific VM version (e.g., 1.1 or 1.2). 
 # Note that the default value depends on the JVM that is running Ant.