diff --git a/doc/cd-intro.xml b/doc/cd-intro.xml
index 285350e..0de52a6 100644
--- a/doc/cd-intro.xml
+++ b/doc/cd-intro.xml
@@ -6,7 +6,7 @@ One specifies a class diagram using the Java syntax complemented by
 tags.
 Running the UmlGraph doclet on the specification will generate
 a
-<a href="http://www.research.att.com/sw/tools/graphviz/">Graphviz</a>
+<a href="http://www.graphviz.org/">Graphviz</a>
 diagram specification that can be automatically processed to
 create Postscript, GIF, SVG, JPEG, fig, or Framemaker drawings.
 <p />
diff --git a/doc/cd-oper.xml b/doc/cd-oper.xml
index 4b686ba..b58b31a 100644
--- a/doc/cd-oper.xml
+++ b/doc/cd-oper.xml
@@ -4,7 +4,7 @@
 To use UMLGraph class drawing facility you need to have
 <a href="http://java.sun.com/j2se/javadoc/"><em>javadoc</em></a>
 and
-<a href="http://www.research.att.com/sw/tools/graphviz/">Graphviz</a>
+<a href="http://www.graphviz.org/">Graphviz</a>
 installed on your computer.
 Both programs are freely available, from Sun and AT&amp;T respectively,
 for many platforms including Unix and Windows.