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diff --git a/docs/source/overview.rst b/docs/source/overview.rst
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--- a/docs/source/overview.rst
+++ b/docs/source/overview.rst
@@ -30,7 +30,7 @@ community <https://www.stackstorm.com/community/>`_.
 How it Works
 ------------
 
-.. figure:: /_static/images/architecture_diagram.jpg
+.. figure:: /_static/images/architecture_diagram.png
     :align: center
 
     |st2| architecture diagram