diff --git a/README.md b/README.md
index 593c27963750ef7004465697ba550522abfb28af..128398503425a6e482e88ff4d8f74212d55c7baa 100644
--- a/README.md
+++ b/README.md
@@ -9,4 +9,4 @@ The material is organized as follows
 * __Slides__: click [here](./slides/README.md) to download the slides
 * __Links__: click [here](./links/README.md) to go to a list of useful links
 
-Last updated for: __DuMu<sup>x</sup> release 3.3 in October 2020__.
+Last updated for: __DuMu<sup>x</sup> release 3.4 in June 2021__.