diff --git a/README.md b/README.md
index 30f98bba9d799accc1a1089d5150e68802dfabe9..3c8a757ff361a5c711550142a412e9d3cac1b61e 100644
--- a/README.md
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@@ -7,9 +7,9 @@
 <img src="img/Open_BIM_Covid-19__4_.jpg" alt="cype" height="500" >
 <img src="img/Open_BIM_Covid-19__5_.jpg" alt="cype" height="500" >
 Initial developments
-<img src="img/Open_BIM_Covid-19__6_.jpg" alt="cype" height="500" >
-<img src="img/Open_BIM_Covid-19__7_.jpg" alt="cype" height="500" >
-<img src="img/Open_BIM_Covid-19__8_.jpg" alt="cype" height="500" >
+<img src="img/Open_BIM_Covid-19__6_.png" alt="cype" height="500" >
+<img src="img/Open_BIM_Covid-19__7_.png" alt="cype" height="500" >
+<img src="img/Open_BIM_Covid-19__8_.png" alt="cype" height="500" >
 
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 <img src="img/1.png" alt="cype" height="500" >