diff --git a/web.config b/web.config
index 1d956b5..56df27f 100644
--- a/web.config
+++ b/web.config
@@ -10,6 +10,7 @@
 				</hiddenSegments>
 				<fileExtensions allowUnlisted="true" >
 					<add fileExtension=".ss" allowed="false"/>
+					<add fileExtension=".yml" allowed="false"/>
 				</fileExtensions>
 			</requestFiltering>
 		</security>