diff --git a/Projects/AthSimulation/version.txt b/Projects/AthSimulation/version.txt
index 48072075a15264900470e17355272db2fd3fad0b..e6f7b4dcf974471ff7ab5d3bb4521bb93d80fa9b 100644
--- a/Projects/AthSimulation/version.txt
+++ b/Projects/AthSimulation/version.txt
@@ -1 +1 @@
-21.0.54
+21.0.55